Power Supply Circuit Diagram and Schematic

uninterrupted power supply circuit diagram

2011-05-28T17:01:00.000-07:00

uninterrupted power supply schematic

The circuit drawn pertains to a regular industrial UPS (Uninterruptible Power Provide), which shows how the batteries get control throughout an outage in electrical provide or variation beyond the normal limits with the voltage line, without having disruption on the operation supplying a steady regulated output (five Volts by LM7805) and an unregulated supply (twelve Volts).

The input to the primary winding with the transformer (TR1) is 240V. The secondary winding may be raised as much as 15 Volts in case the worth is at least twelve Volts operating two amp. The fuse (FS1) acts as being a mini circuit breaker for defense versus short circuits, or a defective battery cell in actual fact. The presence of electrical power will cause the LED one to light. The light of LED will set off upon power outage along with the UPS battery will consider more than

The circuit was designed to present alot more versatile pattern wherein it can be customized by making use of numerous regulators and batteries to generate regulated and unregulated voltages. Making use of two 12 Volt batteries in sequence and a good input 7815 regulator, can control a 15V provide.

Power Current Limiter 13v 20A Circuit

2011-03-30T14:58:00.000-07:00

This PSU has long been particularly created for current-hungry ham radio transceivers. It delivers safely around 20Amps at thirteen.8V. For reduced currents, a separate existing limiting output, able to 15ma as much as a total of 20A has long been extra. The energy transformer should be able to provide at least 25A at 17.5 to 20V. The decrease the voltage, the reduce energy dissipation.

The rectified existing will be "ironed" by C1, whose capacity will need to not be less than 40.000uF, (a golden rule of close to 2000uF/A), but we suggest fifty.000uF. This capacity could be constructed up by many smaller capacitors in parallel. The base of this design is a basic 12V regulator (7812). The output voltage might be introduced to ideal value (here thirteen.8V) by two exterior resistors (R5 and R6) using this formula: U= 12(1+R5/R6). The very low currents (here 15mA) will maintain the 7812 in its normal perform. As quickly because the present rises over 15ma, the voltage drop on R4 will "open" the Q3, basically handling the high output present. This is actually a PNP transistor (Ic > 25) and current amplification factor of a minimum of twenty. The one which has been tested and confirmed right here is the 2N5683. The existing limiting resistance RL, for that maximum output of twenty Amps must be 0.03 Ohms, rated a minimum of 15W. You possibly can make use of the resistance wire or swap numerous resistors in parallel, totaling the resistance/power values. Values for other currents could be calculated by the rule: RL=0.7/Imax

The RL and Q2 (3A PNP which include BD330) form a brief circuit automated fuse. As quickly as the maximum current reaches 20Amps, the voltage drop more than the resistor RL will open Q2, and thus restrict the B-E Existing of Q3. Parallel to Q2 is Q1, which lights the LED one when the present limiting circuit is active. Once the fuse is active, the Q2 bridges the R3, so the full present would circulation by way of the IC1, and harm it. As a result the R4 is inserted, as to limit the IC1 existing to 15mA. This may make it feasible to run the IC1 without having any cooling aid. The LED two will light up every single time the PSU is switched on.

There is an adjustable current limiter in parallel for the fixed output, thus supplying adjustable present source for scaled-down currents. This circuit is incredibly straightforward also. You might discover that there is no current sensing resistor. But it is definitely there, inside a type of the Rds-on resistance of the N-channel FET, which basically handles the load cutoff from the supply. The perform of the FET is proven in the diagram 2. When the existing Id is rising, the pressure Uds over the resistance Rds rises especially gradually in the starting, but especially quick immediately after the knick. This means, that just before the knick the FET behaves as being a resistor but right after it, works as continuous existing source. The D2, R3 and B-E connection of the Q4 will feeling the Uds voltage with the FET1. When the voltage rises sufficient, the Q4 will shortcut the FET1 gate to mass, and reduce the current circulation via the FET 1 off.

Nonetheless, to allow the FET1 to open, there is particular gate voltage required, which with this case is brought up through the voltage divider consisting of R8, Z1, P1 and R9. So the optimum Gate voltage will probably be the one with the Z1, along with the minimal is going to be around 3V6. The Z1 voltage (Uz1) will therefore establish the max current flowing via the FET one. The diagram two will indicate that for 5 Amps the Uz1 really should be 5V6, and for 20Amps close to 9V6.The Capacitor C4 will determine the “velocity” or the reaction time with the limiter. a hundred uF will make the response time to be about 100ms, and 1n will allow it to be 1us. Inside the created limits, the P1 will restrict the existing output within the array of 15mA to 20A.
You possibly can use each output simultaneously, but the complete output current will be restricted by the value of the RL. This PSU can be built also for greater outputs, as long as the transformer will deal with the present needs, and also you provide adequate cooling for your Q3.

12 to 28V Boost Regulator LM2585

2010-12-18T14:29:00.000-08:00

This boost regulator is for those times when you have a 28v relay, but want to use it with a 12v source. The circuit is built around the National Semiconductor LM2585, and uses the energy stored in an inductor to boost the 12 to 28v. Output voltage can be varied by adjusting the ratio of resistor values on the feedback pin.

The voltage regulator circuit does it’s switching around 100 Khz, but generates no noise if SMT components are used. Output is good for about half an amp continuous, enough to power two or three large microwave relays. The board measures 1.5″x2″.

It is important to note at least these three cautions before powering up the board:

A short-circuit on the output will kill U1 and D1. Always use a 1 ohm 5w resistor, or a 2.5A fast fuse on the 12v input lead.
Do not omit the LED (D2); It provides a visual indicator of a properly operating boost condition, but more importantly, it also provides a minimum load for the output, preventing an output “spike” which will otherwise appear when the load is disconnected abruptly.
Keep the ratio of r2 and r3 to 22 or less to keep the output voltage within the ratings of C4 (C4 on my board is rated at 35wvdc). This ratio plus 1, multiplied times 1.25v, determines the output voltage.

Universal Laptop Power Supply AC/DC Adapter

2010-12-18T14:26:00.001-08:00

One of the things you may not think about when buying a new laptop is what will happen if you lose your laptop AC adapters. Sure this does not seem like something you would lose, but it is very easy to misplace. So it is always a good idea to know where to buy another one, or even have another one handy just in case something like this should ever happen.

If you are going to buy laptop AC adapters online you need to make sure it is the right one. The one that comes with the computer is, of course, the best one to have for it, however, if you buy one online just make sure it is going to fit your computer.

Also, be sure that it is a good model of laptop AC adapters. Some of them can get too hot and overheat. The best thing to do is read some online reviews of the notebook battery chargers, and see which ones work the best. From there you can choose the one that you are going to need. I think it is always a good idea to have a back up anyway. Nothing is worse than having a laptop and not being able to use it. So do not let that happen to you. Go out and get an extra one today.

Replacing notebook power supplies is sometimes an expensive process as it the purchase of an air/auto power supply for your laptop. However for those users who need a new power supply for their notebooks or for users planning to travel, Targus have available a Universal adapter series called the Universal 70 Watt AC/DC Power Adapter that gives the user a variety of ways to power their notebooks.

Features

Power on the go, anywhere: Works at home, office, car, boat, or aeroplane.
Lightweight design: At just 213g, this adaptor is lightweight, compact and ideal for travel.
Compatible with other mobile devices: With the optional Targus Accessory Powering System and device tips, you can power your mobile phone or PDA as well as your notebook.

Basically the Universal 70 Watt AC/DC Power Adapter allows you to plug your laptop into a car cigarette lighter, an aero plane power seat system or into the mains to give your notebook the electricity needed to run the unit. Best of all, the device is 98% compatible with popular 70W notebooks and covers a whopping 6,300 models.Visit Tagus Website

Technical Specifications

Compatibility: Airline Compatibility Chart Always call your airline to confirm inflight power seat system and Targus auto/air compatibility.
Varied models of Acer, Apple, Compaq/HP, Dell, Fujitsu, IBM, Panasonic, Sony and Toshiba.
Other: Includes9 tips 91cm AC input cord 91cm DC input cord 1.82m DC output cord User guide.
Size: 13.7 x 5.5 x 2.2 cm.
Technical: 100-230 VAC 11.75-16.00 VDC.
Warranty: Limited Two Year Warranty.
Weight: 213g

Targus Universal 70 Watt AC/DC Power Adapter is a must have device for those notebook users who travel or even for users that need a second power supply for their PC. The unit is relatively quite small and does not weigh much which is perfect for users on the go.

Universal DC-DC Converter Circuit

2010-12-18T13:58:00.000-08:00

Description:
This circuit will generate a smaller DC output voltage from a larger DC input voltage.It is quick and simple to make and by changing the value of the zener diode, the circuit can be universally adapted to provide other output voltages.The circuit and all diagrams represent a DC convertor with 12V battery input and 9Volt DC output.

The output voltage is equal to the zener diode voltage less 0.7 volts, or :-

Vo = Vz - 0.7 where V z is the value of the zener diode.

With the 10V zener diode as shown in the diagram the output voltage is about 9.3 Volts DC. The supply voltage used must always be at least a few volts higher than the zener voltage. In this example I have used a 12 Volt DC battery to provide the regulated 9 Volt DC output.

The above graph shows how the output is affected by input voltage variations. This was produced with a load current of 100mA and using a 10 volt rated zener diode. Note that the circuit falls sharply out of regulation when the input voltage falls to 11.5 volt, hence the requirement for an adequate supply voltage.

Temperature stability is very good as the above graph shows. The output voltage changes by 8.5mV for every 10 degree rise in temperature. This is less than 1 mV / degree.

Power Dissipation
With a DC-DC convertor, the most important consideration is power dissipation in the output device. Power dissipation is the product of the transistors emitter current and collector-emitter voltage. With this circuit the maximum power dissipation of the BD139 or maximum collector current cannot be exceeded, otherwise the transistor will be destroyed.
Example:
With a 12 Volt supply and a 9 Volt, 100 mA load the dissipation is as follows. Using a 10 volt zener the output voltage will be about 9.3 volts DC therefore:

VCE * IC = (12 - 9.3) * 100 mA = 2.7 Watts

This is well within the maximum limits of power dissipation and collector current, which for the BD139 are 8 watts and 1 amp respectively. If higher load currents are required then the following circuit may be used.

Output dissipation is calculated in the same way, the BD131 has a maximum power dissipation of 15 watts and collector current of 3 amps. The output voltage is approximately 1.4 volts less than the zener diode voltage and supply voltage must be higher than the input voltage by at least 3 volts.

5 Volt Regulated PSU Featuring Overvoltage Protection

2010-12-18T13:55:00.000-08:00

Notes
The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC's are easily damaged by short voltage spikes. A fuse will blow when its current rating is exceeded, but requires several hundred milliseconds to respond. This circuit will react in a few microseconds, triggered when the output voltage exceeds the limit of the zener diode.

This circuit uses the crowbar method, where a thyristor is employed and short circuits the supply, causing the fuse to blow. This will take place in a few microseconds or less, and so offers much greater protection than an ordinary fuse. If the output voltage exceed 5.6Volt, then the zener diode will conduct, switching on the thyristor (all in a few microseconds), the output voltage is therefore reduced to 0 volts and sensitive logic IC's will be saved. The fuse will still take a few hundred milliseconds to blow but this is not important now because the supply to the circuit is already at zero volts and no damage can be done. The dc input to the regulator needs to be a few volts higher than the regulator voltage. In the case of a 5v regulator, I would recommend a transformer with secondary voltage of 8-10volts ac.

Increasing Regulator Current PSU Circuit

2010-12-18T13:53:00.000-08:00

Description:
An outboard pass transistor used to increase the current output of a voltage regulator IC.

Notes
Although the 78xx series of voltage regulators are available with different current outputs, you can boost the available current output with this circuit. A power transistor is used to supply extra current to the load the regulator, maintaining a constant voltage. This transistor is known as an outboard bypass transistor.

Currents below 600mA will flow through the regulator. Above 600mA the input current flowing through the 1 ohm resistor develops a voltage. As this voltage increases above 0.6V (600mA through 1 ohm) then the TIP2955 power transistor starts to conduct, supplying the extra current to the load. The 10 ohm resistor limits excessive base current. The power transistor requires an adequate heat sink as it is likely to get very hot. Suppose you use a 12v regulator, 7812. The minimum input voltage should always be a few volts higher than the regulator output voltage to allow for voltage drops.

The 1 ohm resistor needs to be rated 3 Watts for load currents up to 3 amp and rated 7 Watts for load currents of 5 amps. As the HFE of a power transistor falls with increased collector current it is not recommended to draw more than 5 amps with this circuit. The 10 ohm base resistor drops less power and a 0.5 Watt resistor can be used at all output currents.

Power Dissipation in Bypass Transistor
Assume a supply of 20 volts and that the load will draw 5amps. The power dissipation in the transistor will be Vce * Ic.
Vce = Vcc - Vreg
so
Pdiss = (20-12) * 5 = 40 Watt.

It may keep you warm in the Winter, but you will need a large heatsink with good thermal dissipation. If however the input voltage was 15V then the dissipation would be reduced to just 15 Watts. If you want to increase the output current with a negative regulator, such as the 79xx series, then the circuit is similar, but an NPN type power transistor is used instead.

36V Output L200 Power Supply Circuit

2010-12-18T13:50:00.000-08:00

Description
Power supply with variable voltage and fixed current regulation made using the ubiquitous L200C regulator.

Notes
The versatile 5 pin L200C regulator offers both voltage and current regulation in a single package. The IC also features thermal shutdown and input over voltage protection up to 60 Vdc. The package is also available as L200CV which has straight pins for mounting onto a PCB. The above circuit has current limiting of 1 amp, hence Rsc = 0.45 ohm. The output voltage is variable from 2.85V to 36V. For voltages up to 36V then the input voltage, Vcc must be 40V. The supply voltage must always a few volts higher than the maximum output voltage. If you wanted to make a 9 Volt current limited PSU then the input voltage should be a minimum of 12 Volts.

Maximum Power Dissipation
The L200 has internal limiting to reduce the amount of heat dissipation. This happens when the internal junction temperature reaches 150 °C. The datasheet has a graph of the safe operating area, but if drawing maximum output current of 2 amp, the input voltage minus output voltage difference must be less than 20 Volts.

Specifications:
DC Input Voltage: 40V max.
Peak Input Voltage: 60V max. for 10ms
Output Voltage Range: 2.85 to 36V
Output Current Range: 0.1 to 2A
Quiescent Current: 4.2mA
Output Noise: 80uV

The L200 regulator has many versions; L200, L200C, L200CH, L200CV. These are in fact all the same regulator. The main differences between variations are the thermal junction temperature and pinout.
For the L200, the operating junction temperature is -55 to 150 °C
The L200C operating junction temperature is -25 to 150 Â°C.
The V stands for vertical and is the most common case style; available as a pentawatt package, shown right hand side. The H stands for horizontal and the pins of the L200 are bent at right angles for PCB mounting. The L200T and L200CT are also available but as a TO3-4 layout, this pinout can be seen in the datasheet, link below

Multiplier Single Pulse Voltage Circuit

2010-12-18T13:44:00.000-08:00

Single Pulse Voltage Multiplier
Obtaining higher voltage pulses without a higher voltage power supply

Originally appeared in EDN/Reed Business Information September 18, 2003

Sometimes it's necessary to generate a higher voltage pulse from logic circuits than the circuits themselves can supply. The need to generate a programming pulse for Atmel flash controllers was one of those. In that case, I needed to generate an infrequent pulse that switched from 5 volts to 12 volts in response to a control signal from a microcontroller.

A method that relies on a pushbutton to double the voltage was used in the ATtiny12 fuse restorer, but there, the generation of the +12 volts was done by using a mechanical switch that was manually operated to generate about 18 volts, which was further regulated to +12 volts by a gated regulator. It was good as far as it went, but the generation of the +12 volts could not be triggered by the microcontroller, that is unless one wanted to use an electromechanical relay or elaborate arrangement of switching devices.

The straight-for ward approach to control by a microcontroller could be accomplished by driving a capacitor voltage multiplier (such as in the Seiko display inteface) with a pulse train from a controller's pin, then regulating and switching the resultant voltage, the drawback being that this took a lot of parts.

The circuit below accomplishes the same result. It still uses a transistor to do some switching, and it still needs a pair of diodes and capacitors, as would be used in a conventional multiplier, but it doesn't require a steady stream of pulses and the output voltage is set by a resistor divider as the 100k and 150k resistors make 2 volts that are added to the 10 volt pulse on the transistors' collector. What it doesn't need is a steady stream of pulses to keep the output voltage pumped up all the time.
The basic multiplier cell was inspired by a discussion I had with a well know laser scientist, Mr. Christoph Krah, about laser triggering circuits. After I finished this circuit, I sent it to Mr. Krah to get his opinion of how this circuit related to some of those we discussed years ago. Here is Mr. Krah's taxonomic analysis, which also includes a concise description of circuit operation which I could not improve upon:

"Your circuit seems to be a combination of a Marx and a Cockroft-Walton type multiplier. You charge capacitors in parallel (100uF @ 5V and 100uF at 2V) and then switch them in series by means of a 5V voltage step (5+5+2 = 12V) at the output of the uC. The diodes provide isolation from the power supply."

For many of applications, the diode on the left side can be omitted and the 1k resistor changed to 100k.. This simplifies the circuit at the cost of slightly increasing the rate of droop of the voltage across the first 100 uf capacitor since it will discharge into the 100k resistor as well as driving the base resistor for the transistor and driving the load and 100k/150k voltage divider.

There is no free lunch with this circuit. If the pulse is initiated before the 150k AND 100K resistors charge the 100 uf capacitor sufficiently (60k x 100 uf = 6 seconds), the output voltage will be lower than intended. The charge time of the circuit can be decreased by reducing the values of the capacitors, the output 100 uf capacitor having the most effect because of the high resistance charge path. Reducing the size of the capacitors will make the output pulse droop more quickly.

It should be noted that this circuit also makes a 0 to 10 volt pulse, which appears on the collector of the transistor. If a 0 to 10 volt pulse is desired, the circuitry to the right of the transistor's base resistor may be omitted.

5 to 15V 400mA Regulated Power Supply

2010-11-18T13:39:00.000-08:00

5 to 15V 400mA Regulated Power Supply

This project is a simple DC regulated power supply that has a variable DC voltage range from 5V to 15V. It can supply current up to a 400mA to power the various circuits for your electronic projects. The voltage output is varied by using the potentiometer VR1. In this circuit, the input line power supply is designed for 240VAC. If 110VAC input is used, change the ratings of the varistor to 150VAC and the transformer ratio to 110V/12V.

Fuse F1 is used as a protection in case there is any short circuit in the circuit. Varistor V1 is connected in parallel to the input of the line voltage to clamp the surge voltage from the line to a reasonable level that helps to protect the transformer and other circuitry. Once the voltage level surge to a high level beyond the ability of the varistor to absorb it, fuse F1 or varistor V1 or both will burn. If this circuit failed after a period of operation, check that the fuse and the varistor are still in good condition or else replace them.

Diodes D1, D2, D3 and D4 are used to rectify the 12VAC voltage to DC voltage. Electrolytic capacitor E1 is used as a smoothing capacitor to reduce the ripple of the DC voltage. The DC voltage is fed into the input of 7805 regulator where the output DC voltage is obtained. Changing the value of VR1 will change the output of the DC voltage. Capacitor C1 is used to filter out high frequency component from the power supply.

2V to 25V 5A LM338 Power Supply Circuit

2010-11-18T13:32:00.000-08:00

2V to 25V LM338 Power Supply Circuit

This project uses a LM338 adjustable 3 terminal regulator to supply a current of up to 5A over a variable output voltage of 2V to 25V DC. It will come in handy to power up many electronic circuits when you are assembling or building any electronic devices. The schematic and parts list are designed for a power supply input of 240VAC. Change the ratings of the components if 110VAC power supply input is required.

As shown in the figure above, the mains input is applied to the circuit through fuse F1. The fuse will blow if a current greater than 8A is applied to the system. Varistor V1 is used to clamp down any surge of voltage from the mains to protect the components from breakdown. Transformer T1 is used to step down the incoming voltage to 24V AC where it is rectified by the four diodes D1, D2, D3 and D4. Electrolytic capacitor E1 is used to smoothen the ripple of the rectified DC voltage.

LM317K 3A Switching Regulator Circuit

2010-09-13T10:35:00.001-07:00

LM317K 3A Switching Regulator Circuit

When compared to linear voltage regulators the switching voltage regulators are much power efficient. In the case of linear voltage regulators the difference between the input and output voltage is just wasted and for switching regulators there is almost no such wastage and that’s why the switching regulators have great power efficiency ranging up to 85% . In simple words, the switching regulator operates by taking small bits of energy from the input voltage source and then transferring it to the output with the help of a solid state switch and a control circuitry. Since the switching element is either fully open or closed at any moment, no energy is wasted across it. The control circuit controls the duty cycle of the solid state switch which in turn determines rate at which energy is transferred to the output.

The electronic circuit given here is of a simple and low cost switching regulator using the IC LM317 that can deliver up to 3A of current. The input voltage range of this circuit is between 8 to 35V DC and the output voltage can be adjusted between 1.8 to 32V DC. The output voltage can be adjusted by using the POT R4.

LM2575 and LM2577 Regulator Switching Circuit

2010-09-13T10:28:00.000-07:00

Switching regulators are available is different circuit configurations including the flyback, feed-forward, push-pull, and non-isolated single-ended or single-polarity types. Also, the switching regulators can operate in any of three modes – step-down, step-up, or polarity inverting. rovide the active functions for step-down (back) switching regulator, capable of driving a1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V and an adjustable output version.

LM2575 Regulator Switching Circuit

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator. LM 2575 series offers a high-efficiency replacement for popular 3-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required. Fixed output voltage version is illustrated in figure.

LM2577 Regulator Switching Circuit

The National Semiconductor LM 1577/LM 2577 are monolithic ICs that provide all of the power and control functions for step-up (boost), fly back, and forward converter switching regulators. The device is available in three different output voltage versions: 12 V, 15 V and adjustable.

Via:[http://www.circuitstoday.com/switching-regulators-using-lm-2575-and-lm-2577]

LM2576-ADJ 3V/3A Switching Regulator Circuit

2010-09-13T10:24:00.000-07:00

I build this project when I have a problem to driver stepping motor that draw current 3A at 3V.After search the infomation on the internet I have found LM2576-ADJ which is an adjustable output version of 3A Step-Down Voltage switching Regulator and capable of driving 3A load with excellent line and load regulation. You can change R1 and R2 for your desired output voltage.In my design I use the circuit from the example circuit in data sheet and it works fine.

TOP245Y 24 W Primary–side Regulated Flyback Power Supply

2010-09-13T10:21:00.001-07:00

TOP245Y 24 W Primary–side Regulated Flyback Power Supply Circuit

This document is an engineering report giving performance characteristics of a 24 W Flyback converter – 8 V @ 3 A. This design uses TOPSwitch-GX – an integrated IC comprising a high voltage MOSFET, and PWM controller.This document contains power supply specification, schematic, bill-of-materials, transformer documentation, printed circuit layout, and performance data. A photo of the power supply prototype is shown in Figure above.
Get More Here>>

24 W Primary–side Regulated Flyback Power Supply using TOP245Y

Solar Panel Lead-Acid Batteries Charger

2010-07-06T04:59:00.000-07:00

Solar Panel Lead-Acid Batteries Charger Schematic

This Batteries Charger is advised for charging closed lead-acid batteries with a solar console in baby and carriageable applications. The accepted diode that prevents the array from absolution through the solar console has been replaced by a FET-comparator combination.

The batteries charger will stop charging already a pre-set voltage (temperature compensated) has been reached, and recommence charging aback the voltage has alone off sufficiently. The amount is broken aback the array voltage drops beneath 11V and reconnected aback it gets aback to 12.5V.

The batteries charger ambit has the afterward features:

* Charges until Vbat = 13.8V (adjustable), again float charges;

* Shuts bottomward amount aback Vbat < 11V (adjustable), resets at 12.5V;

* Temperature compensation;

* Will assignment with bargain and readily accessible apparatus like LM393 comparators and BUZ11 FETs;

* Uses beneath than 0.5mA aback application TLC393 comparators;

* Burns beneath than 20mW in FETs aback charging at 0,5A. (More big-ticket FETs with a lower RDSON will crop alike bigger results). Note that the charging accepted is bound alone by the solar console used.

Sealed Lead Acid 12V Battery Charger

2010-07-06T04:56:00.000-07:00

Sealed Lead Acid 12V Battery Charger Schematic

There are a cardinal of credibility we allegation to awning about the affliction and use of Sealed Lead Acid batteries.

Firstly, these batteries allegation be charged, absolved and stored actual carefully.

We commonly anticipate batteries can be stored for months (if not years) and they will be accessible for actual use.

This is not the case with SLA batteries.

If you abundance a NEW, abounding answerable SLA array for 6 months or more, you will acquisition it may be absolutely discharged.

You may additionally acquisition you cannot allegation it!! It may be worthless.

That's how aerial SLA batteries are.

They allegation be answerable on a approved base to anticipate them absolution to a actual low voltage level.

If the terminal voltage of a SLA array is accustomed to go beneath 8v, a action alleged SULPHATION starts to awning the apparent of the plates and prevents the array actuality re-charged. The centralized attrition of the array increases and it becomes useless. See articles Sealed Lead Acid Array Charger on Amazon

Parts List of SLA Array Charger

2 - 1R8 0.5watt resistors

1 - 150R 0.25 watt resistor

1 - 180R

1 - 560R

1 - 1k5

3 - 2k2

1 - 3k3

1 - 4k7

1 - 8k2

1 - 1k mini trim pot

1 - 1n ceramic

2 - 47u 25v electrolytics

1 - 5mm red LED

4 - 1N4148 arresting diodes

1 - 10v 0.25watt zener

1 - BC 547 transistor

2 - BC557 transistors

1 - MCR100-6 SCR

1 - 1m red lead

1 - 1m atramentous lead

2 - alligator clips

1 - 2m actual accomplished solder

1 - SLA Array Charger PCB

Also required:

1 - 12v AC agent (500mA AC)

1 - ability lead

1 - case

Solar IPod Charger Project and Schematic

2010-07-06T04:38:00.000-07:00

Solar iPod Charger Schematic

The Solar Panel

To accomplish our iPod solar charger we acclimated a 250mA 6 Volt Solar Console (available in the REUK Shop). Alike in the brightest sunshine the voltage is not badly aloft that of the iPod battery, and the accepted is affluence abundant to allegation the array in a few hours in ablaze altitude (even in the UK!).

A blocking diode should be acclimated (in the absolute solar console lead) to anticipate the iPod array from boring clarification at night if it is still affiliated to the panel. Unforunately this after-effects in up to 0.7 Volts actuality absent as calefaction in the diode, so it can be larboard out if you adopt to accept a faster charger which will allegation the array in lower ablaze conditions.

Note that abounding solar panels are supplied with a branch adapted blocking diode.

In adjustment to adapt the voltage from our 6 Volt solar console we acclimated an LM317T dent (available from the REUK Shop) in the afterward cool simple circuit:

Voltage Regulator

...where R1 is a 270 Ohm resistor, and R2 is theresistor used to set the output voltage according to the following equation:

R2 = R1 * ( (VOUT/1.25) -1 )

Since our desired charging voltage is 5 Volts, we see that ideally R2 would be 270 * ((5/1.25) -1) = 810 Ohms. This is not a standard resistor size, however we had an 820 Ohm resistor which should result in an output voltage of 5.05 Volts.

Wiring up the aloft ambit on a prototyping breadboard with a 270 Ohm R1 resistor, and 820 Ohm R2 resistor we can affirm that the achievement voltage is 5.06 Volts - absolute for our iPod charger. It is capital to analysis that the achievement voltage is about 5 Volts application a acceptable multimeter afore attempting to allegation your iPod or the array and/or iPod itself could be damaged.

iPod Solar Charger Prototyping

Connecting the Charger to the iPod

The iPod is supplied with a USB cable. One end is acquainted into the iPod and the added end has a macho USB-A plug.

It can generally be cheaper to buy a cable with a adapted changeable USB-A adapter and cut it off to use in this project. Simply affix the red USB cable wire to the 5V absolute achievement from the LM317T, and the atramentous USB cable wire to the arena (negative).

According the blueprint beneath the 5 Volt achievement from the LM317T should be affiliated to pin 1, and the arena (negative) affiliated to pin 4.

6V Power Supply With 12V Relay

2010-07-06T04:30:00.000-07:00

6V Power Supply With 12V Relay Circuit

Description :

This ambit allows a 12v broadcast to accomplish on a 6v or 9v supply. Most 12v relays charge about 12v to "pull-in" but will "hold" on about 6v. The 220u accuse via the 2k2 and basal diode. When an ascribe aloft 1.5v is activated to the ascribe of the circuit, both transistors are angry ON and the 5v beyond the electrolytic causes the abrogating end of the electro to go beneath the 0v abuse by about 4.5v and this puts about 10v beyond the relay.

5V Regulator Ultra Low-Power Circuit

2010-07-06T04:21:00.000-07:00

5V Regulator Ultra Low-Power Circuit by http://www.extremecircuits.net

The accepted cesspool of the regulator is minute compared with that of, say, a 78L05: at an ascribe voltage of 9 V and open-circuit output, it is aloof beneath 50 µA. The ambit consists of a aboveboard bandgap advertence based on T1 and IC1, followed by an amplifier formed by IC2 and T1. The advertence voltage is about 1.22 V, which is aloft by IC2 to 5 V. The achievement voltage can be set to absolutely 5 V with P1. The ascribe voltage may lie amid 6.5 V and 30 V. The best achievement accepted with the present agreement and basic ethics as defined is about 10 mA. For optimum performance, T1a and T1b charge to be identical, which is why a bifold transtor Type MAT02 is used. Other types that may be acclimated are the MAT01, SSM2210 or LM394. In principle, two accepted BC transistors may be used, provided they are called for identical beginning voltage. Circuits IC1 and IC2 are programmable op amps Type OP22. In the case of IC2 this has the account that the aiguille achievement accepted can be set readily by altering the accumulation accepted to the op amp with R9. The akin of the accepted may be amid 500 nA and 400 µA. Bear in apperception that a beyond achievement accepted requires the use of a added awful rated achievement transistor. Filter R6-C1 prevents any affected pulses extensive the ascribe of IC2. Capacitor C2 improves the adherence of the regulator, decidedly with best beating loading. Note that the ambit has a aerial resistance, so that it is appropriate to abode it in a buried asylum to anticipate causeless alluring and electromagnetic arrest actuality accompanying to the circuit. The regulator was activated with a absolute amount accepted of 1 mA on which was superimposed a square-wave accepted of 10 mA. The analysis after-effects are abbreviated in the table, in which Ig represents the accepted fatigued by the circuit.

Low Cost Universal Charger Circuit Diagram

2010-02-22T12:44:00.001-08:00

Here is the ambit diagram of a low amount accepted charger for NiCD - NiMH batteries. This ambit is Ideal for car use. It has adeptness to transform a mains adapter in to a charger . This one can be acclimated to allegation cellular phone, toys, portables, video batteries, MP3 players, ... and has selectable allegation current. An LED is amid in ambit to announce charging. Can be congenital on a accepted purpose PCB or a veroboard. I achievement you absolutely like it.

Low Cost Universal Charger Circuit Diagram Prt

R1 = 120R-0...5W
R2 = See Diagram
C1 = 220uF-35V
D1 = 1N4007
D2 = 3mm. LED
Q1 = BD135
J1 = DC Input Socket

USB Mobile Phone Battery Charger Circuit

2010-02-22T12:34:00.000-08:00

USB Mobile Phone Battery Charger Circuit

This simple ambit can accord adapted 4.7 volts for charging a adaptable phone. USB aperture can accord 5 volts DC at 100mA accepted which is acceptable for the apathetic charging of adaptable phones. Most of the Adaptable Buzz batteries are rated 3.6 volts at 1000 to 1300 mAh. These array packs accept 3 NiMh or Lithium beef accepting 1.2 volt rating. Usually the array backpack requires 4.5 volts at 300-500 mA accepted for fast charging.

But low accepted charging is bigger to access the ability of the battery. The ambit declared actuality provides 4.7 adapted voltage and acceptable accepted for the apathetic charging of the adaptable phone. Transistor Q1 is acclimated to accord the adapted output. Any average ability NPN transistor like CL100, BD139, TIP122 can be used. Zener diode D2 controls the achievement voltage and D1 protects the polarity of the achievement supply. Front end of the ambit should be affiliated to a A blazon USB plug.

Connect a red wire to pin1 and atramentous wire to pin 4 of the bung for accessible polarity identification. Affix the achievement to a acceptable charger pin to affix it with the adaptable phone. After accumulating the circuit, admit the USB bung into the atrium and admeasurement the achievement from the circuit. If the achievement is OK and polarity is correct, affix it with the adaptable phone.
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Low Dropout Adjustable Regulator Circuit

2010-02-22T12:23:00.000-08:00

Low Dropout Adjustable Regulator Circuit

We frequently acquire requests for voltage regulators for systems for which the accepted LM317 is not suitable. Although the LM317 can acquire ascribe voltages up to 3-40 Volts, and achievement adapted voltages from 1.2-37 Volts, it can alone achievement a reliable anchored voltage if the ascribe voltage is at atomic 2-3 Volts college than the called achievement voltage - e.g. to get a reliable 12.0V output, the ascribe voltage would charge to be 15V+. This voltage aberration is the dropout, the bulk of voltage alone (dissipated/wasted as heat) in the regulator.

Low Dropout Anchored Voltage Regulators

Where a anchored voltage regulator is required, article like the LM2940 ambit can be used. These are low dropout voltage regulators about accessible with anchored achievement voltages of 5, 10, 12, and 15 Volts.

Such a regulator is complete for use for archetype area 12V rated LED spotlights are to be powered with a 12V battery. The array voltage can ambit from 12.5 to 14+ Volts, and we charge a anchored 12.0V to ability the LEDs, so although an LM317 would not be reliable, the LM2940 (which will bead no added than 0.5 Volts) would accord a anchored 12.0V achievement beyond the abounding voltage ambit of the array reliably.

Unfortunatately we cannot use an LM2940 area a non-standard voltage - e.g. 8.50 Volts - is required. Ideally we appetite article with the adaptability of the LM317, but the low dropout characteristics of the LM2950. Fortunately such a basic exists and it is the LM2941 adjustable low bead out voltage regulator (which is pictured above).

The LM2941 can achievement voltages from 5.0 to 15.0 Volts * with a archetypal dropout voltage of aloof 0.5 Volts (@ 1 Amp, beneath for lower currents), and an complete best dropout of 1.0 Volts beyond the abounding temperature range. The LM2941 can accumulation up to 1 Amp of current.

* Note that the best ascribe voltage is 26 Volts, so this basic is not acceptable for 24 Volt rated systems.

Pictured aloft is the archetypal appliance ambit application the LM2941 as an adjustable voltage regulator. The advertence voltage (measured beyond ADJ and GND) is 1.275V. With the resistor R1 about set to 1K, the amount of R2 for any accustomed adapted achievement voltage is affected application the afterward equation:

R2 = R1 (( Vout / Vref) - 1 ))

For example, if an 8.00V low voltage bead out regulator is required, R1 = 1K, Vref = 1.275, and so R2 = 1000((8.00/1.275) - 1) = 5276 Ohms.

Turning the blueprint about we can additionally account the achievement voltage for any accustomed ethics of R1 and R2:

Vout = Vref * ((R1 + R2) / R1)

...so if we accumulate R1 as 1K and set R1 as 5K1 (since the 5276 Ohm amount affected is acutely not a accepted resistor) we see that Vout = 1.275 ((1000 + 5100) / 1000) = 7.78 Volts. (Note that it is accessible to affix accepted resistors in alternation abacus up their ethics to get an exact amount if a actual authentic voltage regulator is appropriate - e.g. 4K7 + 560R + 10R + 5R6 = 5276 Ohms for an 8.00V regulator)

Click actuality to appearance the LM2941 Datasheet (PDF) with sample circuits, and abundant blueprint data.

Delay and Music Power Supply Circuit with High and Low Voltage

2010-02-04T02:34:00.000-08:00

Delay and Music Power Supply Circuit with High and Low Voltage

Voltage variations and ability cuts abnormally affect assorted equip- ment such as TVs, VCRs, music systems and refrigerators. This simple ambit will assure the cher accessories from aerial as able-bodied as low voltages and the voltage surges (when ability resumes). It additionally gives a accordant tune back mains ability resumes. Back mains voltage is normal, the DC voltage at the cathode of zener diode D4 is beneath afresh 5.6V. As a aftereffect transistor T1 is in off state. The DC voltage at the cathode of zener diode D5 is greater than 5.6V and as a aftereffect transistor T2 is in on state. Consequently, broadcast RL1 gets energised, which is adumbrated by lighting up of blooming LED. Under aerial mains voltage condition, transistor T1 switches to on accompaniment because the voltage at cathode of zener diode D4 becomes greater than 5.6V. Consequently, transistor T2 switches to off state, authoritative the broadcast to de-energise Under low mains voltage condition, transistor T1 switches to off accompaniment and as a aftereffect transistor T2 additionally switches to off state, authoritative the broadcast to de-energise.

Timer IC 555 in the ambit is configured to accomplish in a monostable mode. The beating amplitude is about 10 abnormal with the timing basic ethics acclimated in the circuit. Back the ability resumes afterwards a break, pin 2 of IC 555 goes low briefly and this triggers it. Its achievement makes music IC UM66 to accomplish through transistor T3. Simultaneously, transistor T1 additionally gets advanced biased as the monostable IC1 achievement is affiliated to its abject via diode D8 and resistor R7. As a result, transistor T1 conducts and biases transistor T2 to cut off. Thus broadcast RL1 charcoal de-energised for the continuance of address beating and the amount is adequate adjoin the voltage surges.

To acclimatize presets VR1 and VR2, you may use a manually capricious auto-transformer. Set the achievement of auto-transformer to 270V AC and affix it to the primary of agent X1. Acclimatize preset VR1 such that broadcast RL1 aloof de-energises. Next set the achievement of auto-transformer to 170V AC. Now acclimatize preset VR2 such that broadcast RL1 afresh de-energises. Aggregate ascendancy VR3 may be adapted for the adapted achievement aggregate of the tune generated by IC UM66

LM350 10A Variable Regulator Power Supply

2010-02-04T02:14:00.000-08:00

LM350 10A Variable Regulator Power Supply

This be Variable Regulator ability accumulation Circuit. That be High Accepted Source 10amp. By use the chip ambit LM350. Which accepted it controls Voltage achievement get 1.2V to 25V and accord accepted about 3Amp. But back accompany alongside 3 pcs. Can accord accepted achievement be 10Amp max for this circuit. It can adjustable voltage achievement get 4.5V to 25V at 10Amp.

Other detail amuse see in the website http://my.integritynet.com.au/purdic/power3.htm.

Gyrator Circuit

2010-02-04T02:08:00.000-08:00

Gyrator Circuit

To abstain balance ripple achievement on a ability accumulation agriculture a abundant load, usually a ample amount capacitor is called afterward the rectifier. In this circuit, C1's amount is alone a 470uF. The gyrator ambit works on the assumption that the amount of ascribe capacitance at the base-emitter terminals of a transitor is finer assorted by the changeless advanced accepted gain, HFE of the transistor. In this ambit C2, a 100uF capacitor is finer abstract at the ouput ( Vreg ).

If you accept a dc accepted gain, HFE of 50 for the 2N3055 ability transistor, again the able amount of the cutting capacitor would be 50x this value; or be the aforementioned as application a 5000uF capacitor after the ability transistor. The blueprint beneath shows the achievement voltage and accepted through the amount :-

The amount draws about 400mA. With the achievement anon from the rectifier there is about 5v pk-pk ripple in the output. Application the achievement at the emitter of the transistor things are abundant better. The ambit will booty a few hundred milliseconds for the achievement voltage to balance and ability best value. The advantages are that a smaller, beneath cher backlog capacitor can be acclimated with this ambit to accord a aerial affection smoothed supply.

via : http://www.zen22142.zen.co.uk

Power Supply Voltage Indicator Circuit

2010-02-04T02:05:00.000-08:00

Power Supply Voltage Indicator Circuit

Notes

This simple and hardly odd ambit can acutely appearance the akin of the accumulation voltage (in a beyond device): as continued as the indicator has acceptable 12 volts at its input, LED1 gives steady, ceaseless (for the naked eye) chicken light. If the ascribe voltage avalanche beneath 11 V, LED1 will alpha to blink and the blinking will aloof get slower and slower if the voltage drops added - giving actual bright and automatic representation of the supply's status. The blinking will stop and LED1 will assuredly go out at a little beneath 9 volts.

On the added hand, if the ascribe voltage rises to 13 V, LED2 will alpha to glow, accepting at about abounding ability at 14 V.

The appropriate voltages can be adapted primarily by adjusting the ethics of R1 and R4.

The base-emitter diode of T2 basically aloof stands in for a zener diode. The emitter-collector aisle of T1 is inversely polarized and if the ascribe voltage is aerial abundant - T1 will account oscillations and the abundance will be proportional to the ascribe voltage. The alleviation oscillator ceases cycling back the ascribe voltage gets so low that it no best can account breakdown forth the emitter-collector path.

Not all baby NPN transistors appearance this affectionate of behavior back inversely polarized in a agnate manner, but abounding do. BC337-40 can alpha oscillations at a almost low voltage, added types about crave a volt or two more. If experimenting, be accurate not to bite a aperture through the accessory beneath test: they oscillate at 9-12 V or not at all.

via : http://www.zen22142.zen.co.uk

12V to 24V Simple DC Converter Circuit

2010-02-04T01:39:00.000-08:00

12V to 24V Simple DC Converter Circuit

A acquaintance of me wants the ambit enhances Voltage 12VDC from be 24VDC or DC to DC Converter 12V to 24V. By fix acknowledge that be the ambit is simple , body not difficult. I afresh admonish this ambit try out anticipate use aloof Transistors D1616 = 2 pcs. with agent the small-sized , mix with added accessories a little alone again. Follow a account has can to use this ambit with baby fan motor.

LM1458 and 2N3055 DC Variable Regulator Power Supply

2010-02-04T01:36:00.000-08:00

LM1458 and 2N3055 DC Variable Regulator Power Supply

Power ascendancy is adjustable 3-25 volts and is accepted bound to 2 amps as shown,but may be up to 3 amps in a baby accepted faculty resistor by options (0.3 ohm). 2N3055 transistors 2N3053 and should be in the sinks. actual hot appropriate now and resistor should be rated at 3 watts or more. voltage that is controlled by 1 / 2 of the op amp LM1458 or 1458-AMP. It may be commissioned in the ambit below, but sources advance pressure. dispensing pin 8 is bound to 30 VDC, which can access by 6.2 volt zener or 5.1 resistor K alternation is 8 pin. best voltage DC accumulation for 1458 and 1558 are 36 and 44, respectively. ability agent should be. As can be accepted in the accepted voltage. Enter at atomic 4 volts college than the adapted achievement voltage but not beat the best bulk of op-AMP beneath low amount conditions. Agent is apparent as a centermost broke 25.2 volt AC / AMP 2 units to advice ascendancy the 24 volts at 0.7 amps, 15 volts at 2 amps or 6 volts at 3 amps. Achievement AMP 3 is the centermost of the water. agent that changes the 18 volt position. All apparatus charge accept a Radio berth barring of LM1458 op-AMP.

LM317 and 2N3055 High Current Regulated Power Supply Circuit

2010-02-04T01:33:00.000-08:00

LM317 and 2N3055 High Current Regulated Power Supply Circuit

Control aerial accepted beneath the aisle added or adapted for the break of ability transistors to ascendancy LM317 through alive carefully with the complete and improve. Performance burden on accession of two alongside 2N3055 canyon transistors should be abutting to the voltage output. LM317 charge bout the ascribe volts with a appropriate emitter / abject bead of the 3055s, including those absent in the (0.1 ohm) resistors equalizing (1volt. at 10 amps) to catechumen and breach rectifier / clarify circuits application a low volts college voltage output. LM317 will accommodate over 1 AMP of the drive accepted through the abject of transistors 10 and assumming accept to accelerate 15 copies or added amps.

LM317 6V DC Power Supply Circuit

2010-02-04T01:29:00.000-08:00

LM317 6V DC Power Supply Circuit

This be dc ability accumulation 6V circuit. It uses chip cardinal ambit LM317T be important equipment. It can accept the trend comes out about 1A by is appearance ambit DC voltage regulated. And accept the ambit protects good. We can fix achievement voltage get from R1,R2. The diode D3-D4 (1N4002) use assure voltage breeze about-face aback be bad with IC get. The Capacitors in the ambit helps Filter voltage calmly and completed most. The agent should accept 1A -2A admeasurement for accepted able-bodied sir.

5V High Current Regulated Circuit

2010-02-04T01:27:00.000-08:00

5V High Current Regulated Circuit

Since the accession of the 3-pin regulator ICs in the market, the affair of designing ability accumulation circuits has become beneath and beneath discussed. However, the aforementioned new ICs absolute the types of ability circuits actuality congenital in amusement labs to about 1 ampere units. In addition, ability stages are required, because aerial accepted (5A or 10A) voltage regulator ICs are actual expensive. This is the capital acumen why hobbyists usually opt for a detached solution. The abstraction of cascaded ability stages are absolutely not that bad. For this reason, we accept acclimated detached apparatus for the ambit featured above.

This regulator ambit was advised for microcomputer systems and added applications that crave beating aggressive ability accumulation while carrying aerial accepted achievement at the aforementioned time. The 723 IC acclimated in this architecture is broadly replaced by the new 3-pin regulators. However, the 723 IC is adjustable and its abstruse abstracts are bigger in some points. It is configured in the ambit to achievement voltage levels from 2V to 7V. The bare ability is produced by acceleration the voltage akin through a voltage doubler circuit, afterlight it, and acclimation it with a 3-pin regulator IC.

This acutely complicated address is actuality activated actuality to accumulate the voltage akin as low as accessible at the accessory ambagious of the transformer. This makes it accessible to accumulate the ability amusement at transistors T1 and T2 as low as accessible too.

The calefaction bore for T1, T2 and T3 charge be appropriately dimensioned. A calefaction attrition of about 2�C (C F) is recommended. For the aforementioned reason, the resistor ethics for R1, R2 and R2 charge be produced by base resistors in parallel. For R1 and R2: affix two 0.33 ohms (5watts) in alongside for each. For R6: affix two 0.22 ohms (5watts) in alongside by a accepted achievement of 6 amperes; or affix three 0.22 ohms (5watts) in alongside by an accepted achievement of 8 amperes. As added assurance measure, adhesive these resistors on the pcb with some ambit from the board.

If one desires to abolish the voltage doubling, aloof abolish the apparatus D1, D3, C3, C4 and move the diode D2 to the absolute DC band as apparent by the dotted band in the Diagram 1.0. Additionally, the achievement voltage of the agent charge be added , and the ethics of C1, C2, R4 and R5 adapted appropriately.

This ability supply�s voltage achievement drops, by a amount of 0.85 ohms, from 5.5 volts to 5.32 volts. That after-effects to a accepted achievement of about 8 amperes! The voltage bead is aloof 3.3%! The ripple DC voltage is alone beneath than 28 mVeff at the output.

9 Volt 2 Amp PSU Single IC Regulator Power Supply

2010-02-04T01:20:00.000-08:00

Notes

There is little to be said about this circuit. All the assignment is done by the regulator. The 78S09 can bear up to 2 amps connected achievement whilst advancement a low babble and actual able-bodied adapted supply.

The ambit will assignment after the added components, but for about-face polarity aegis a 1N5400 diode is provided at the input, added cutting actuality provided by C1. The achievement date includes C2 for added filtering, if powering a argumentation ambit than a 100nF capacitor is additionally adorable to abolish any aerial abundance switching noise.

via : http://www.zen22142.zen.co.uk/Circuits/Power/9v2a.htm

L200 Battery charger circuit

2010-01-19T11:37:00.000-08:00

A actual simple array charger ambit accepting about-face polarity adumbration is apparent here.The ambit is based on IC L200 . L200 is a bristles pin capricious voltage voltage regulator IC.The charging ambit can be fed by the DC voltage from a arch rectifier or centermost broke rectifier.Here the IC L200 keeps the charging voltage constant.The charging accepted is controlled by the alongside aggregate of the resistors R2 & R3.The POT P1 can be acclimated to acclimatize the charging current.This ambit is advised to allegation a 12 V advance acerbic battery.The transistor t1,diode D3 and LED are acclimated to accomplish a array about-face indicator.In case the array is affiliated in about-face polarity ,the about-face polarity indicator red LED D5 glows.When the charging action is activity on the array charging indicator blooming LED D4 glows.
L200 Battery charger circuit

Notes.

The circuit can be assembled on a good quality PCB or common board.

The values of R2 & R3 can be obtained from the equation,

(R2//R3) =( V5-2)/(Io).

Where V5 is the charging voltage (voltage at pin 5) and Io is the charging current.

The POT R8 can be used for fine adjustments of charging current.

If battery is connected in reverse polarity the RED LED will glow.

When the charging is going on the GREEN LED will glow.

The rectified input voltage to the charger can be 18V.

12 VDC to 120 VAC Inverter Circuit

2009-12-07T11:36:00.000-08:00

12 VDC to 120 VAC Inverter Circuit

Ever bare a low ability 120volt AC ability antecedent for your car, van or truck? Well this ambit should do the ambush for you. It will accumulation 15 watts of AC ability to a device. It should ability lamps, shavers, baby stereos and baby appliances. If you draw to abundant ability the ambit will shut bottomward all by itself. The achievement of this ambit is a aboveboard beachcomber so there may be some apparent hum on audio units acquainted into it. To abate some of the hum access the amount of the achievement capacitor which is at .47uf now. That transistor in the ambit are aerial ability PNP transistors. Radio Shack allotment cardinal 276-2025 are acceptable ones to use or TIP32. The agent is a 24 volt 2 amp centermost broke accessory Radio Shack allotment cardinal 273-1512 or equivalent.

500W low cost 12V to 220V Inverter

2009-12-07T11:29:00.000-08:00

Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer.

Attention: This Circuit is using high voltage that is lethal. Please take appropriate precautions

How to calculate transformer rating

The basic formula is P=VI and between input output of the transformer we have Power input = Power output

For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*1

So you have to wind the step up transformer 12v to 220v but input winding must be capable to bear 20A.

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LM317 Overvoltage Protection Circuit

2009-12-07T11:17:00.000-08:00

It is a voltage regulator that allows a 6v carriageable accumulation to be acquired from the 12v car battery. You can add a 6.2V zener diode and a LED to acquaint you back the ascribe accumulation is overvoltage. If you could acquisition a broadcast that would accomplish from 6.2v appropriate up to 12v that you could affix in such a way that if over voltage occurred, again the broadcast would automatically about-face off the achievement preventing accident to any affiliated equipment.

Such a broadcast would be absolutely difficult to find, so I advised this, it is a simple two transistor ambit which will about-face off the achievement should the voltage accession aloft 6.2v (this can be afflicted by selecting a altered amount of zener diode ).

Components are as follows:

ZD1 =3D 6.2v Zener diode (you can change this to any value, the ambit will about-face off the achievement if the ascribe voltage raises aloft the amount of the zener diode)

R1 = 1K Resistor (this can be of any ability rating, it carries actual little power)

R2 = 1K Resistor (this can be of any ability rating, it carries actual little power)

T1 = Low ability NPN Transistor (BC108 or BC547 will do fine)

T2 = NPN transistor transistor able of switching the accessories you are active (BFY51 or BC140 can about-face 1 Amp, which is the best the voltage regulator ambit can handle)

It is appropriate to analysis this ambit with a voltmeter, boring accretion the voltage on the regulator ambit and accomplish abiding that this ambit switches off the achievement back the amount of the zener diode is reached, afore active in your big-ticket equipment. This ambit is advised to be acclimated with the voltage regulator acquaint by Matthew Hewson, my overvolatge add-on ambit is apparent with the aboriginal below:

LM317 Overvoltage Protection Circuit

Overcurrent Trip Regulator Power Supply

2009-12-07T11:13:00.000-08:00

Overcurrent Trip Regulator Power Supply Circuit

Available to 4QD-TEC members are rather more sophisticated power supplies: a larger supply of the same nature s this is available, with parts information and board layout. A Circuit board is also likely to be made available in time.

Also in preparation are details of a full laboratory type power supply with fully adjustable current limiting and output voltage. This can be used to make, maybe, 0-50v at 0-5 A, or other ranges as the builder may require.

AC/DC POWER SUPPLY MINIATURE ISOLATED

2009-12-07T11:07:00.000-08:00

AC/DC POWER SUPPLY MINIATURE ISOLATED

AC/DC POWER SUPPLY MINIATURE ISOLATED CIRCUIT uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It uses two tiny SCRs that alternately discharge two capacitors through a miniature high frequency transformer. The voltage spikes produced through the transformer are rectified, filtered and regulated. A very common 8 ohm audio impedance matching transformer can be used for the transformer.

QRO 600 VOLTS POWER SUPPLY

2009-12-07T11:04:00.001-08:00

QRO 600 VOLTS POWER SUPPLY CIRCUIT

Amateur Radio Transmitters application valves such as 807 or1625 works able-bodied with a bowl voltage amid 600V to 700 Volts.The ambit declared actuality is a abounding beachcomber voltage doubler. The achievement voltage is alert the ascribe voltage. For 230V AC ascribe the achievement will be about 600 Volts.

Resister R1 is acclimated to absolute the antecedent aerial voltage and aerial currents. Capacitor C1, C2, C3 calm with coils L1 and L2 anatomy ascribe band filter. The capacitors C4 and C5 protects diodes from aerial voltage transients on the AC band as able-bodied as reduces inter carrier hum accentuation of the R.F best up by the mains. Capacitors C6 and C7 provides abundant clarification for the achievement DC Voltage.

5 Watt Digital Power Supply

2009-12-07T10:58:00.000-08:00

5 Watt Digital Power Supply is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily available, but usually their voltage regulation is very poor, which makes then not very usable for digital circuit experimenter unless a better regulation can be achieved in some way. The following circuit is the answer to the problem.

This circuit can give +5V output at about 150 mA current, but it can be increased to 1 A when good cooling is added to 7805 regulator chip. The circuit has over overload and therminal protection.

Power High Performance UPS With 8A Switcher Circuit

2009-11-29T16:04:00.000-08:00

Power High Performance UPS With 8A Switcher Circuit

All high-current switchers are sensitive to board layout; take care when designing the pc board. You'll obtain the best results by using a multilayer board, so you can dedicate a single layer to ground plane. You should tie the "power" components (C1, C2, C16, D2, C12, C13, C14) directly to this ground plane and group these components so that the connection paths are as short as possible. You should connect the low-current ground, as Fig 1 shows, and then tie it to the power ground at a single point near C13. Finally, all traces in the switching power path (R5, Q3, and L1) must be as short as possible.

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LM2596 Simple Switch Step Down Regulator Circuit

2009-11-29T15:47:00.000-08:00

LM2596 Simple Switch Step Down Regulator Circuit

The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation†, and a fixed-frequency oscillator.

The LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package.

A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.

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Step Up Input Voltage DC-DC Converter

2009-11-29T15:43:00.001-08:00

Step Up Input Voltage DC-DC Converter Circuit

This circuit uses bog standard parts, without requiring a magical "do-it-all" IC. You can make an ultra simple 1.5v to 9v regulated stepup converter by using a TL496 IC, a coil and a capacitor, but that's not so much fun if you want to experiment. I've already built a TL496 based circuit so I started doing web searches for something that I could make that would allow more fiddling and a wider range of applications.

Note: More Info about the Step Up Input Voltage DC-DC Converter Circuit Please Visit Here

TL494 200W ATX PC Power Supply

2009-11-29T15:38:00.000-08:00

Here I bring you wiring diagram of PCs power supply of DTK company. This power supply has ATX design and 200W performance. I was drawed diagram, when I repaired this power supply. This power supply circuit uses chip TL494. Similar circuit is used in the most power supplies with output power about 200W.Device use push-pull transistor circuit with regulation of output voltage.

TL494 200W ATX PC Power Supply Circuit

Line voltage goes through input filter circuit (C1, R1, T1, C4, T5) to the bridge rectifier. When voltage is switched from 230V to 115V, then rectifier works like a doubler. Varistors Z1 and Z2 have overvoltage protect function on the line input. Thermistor NTCR1 limits input current until capacitors C5 and C6 are charged. R2 and R3 are only for discharge capacitors after disconnecting power supply. When power supply is connected to the line voltage, then at first are charged capacitors C5 and C6 together for about 300V.

Then take a run secondary power supply controlled by transistor Q12 and on his output will be voltage. Behind the voltage regulator IC3 will be voltage 5V, which goes in to the motherboard and it is necessary for turn-on logic and for "Wake on something" functions. Next unstabilized voltage goes through diode D30 to the main control chip IC1 and control transistors Q3 and Q4. When main power supply is running, then this voltage goes from +12V output through diode D.

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10 Amp 13.8 Volt Power Supply

2009-11-29T15:32:00.001-08:00

10 Amp 13.8 Volt Power Supply Circuit

10 Amp 13.8 Volt Power Supply Parts List :

R1 1.5K ¼ Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)
R2,R3 0.1 Ohm 10 Watt Resistor (Tech America 900-1002)
R4 270 Ohm ¼ Watt Resistor
R5 680 Ohm ¼ Watt Resistor
R6,R7 0.15 Ohm 10 Watt Resistor (Tech America 900-1006)
R8 2.7K ¼ Watt Resistor
R9 1K Trimmer Potentiometer (RS271-280)
R10 3.3K ¼ Watt Resistor
C1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)
C5 100 Picofarad Ceramic Disk Capacitor
C6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)
IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.
Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)
Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)
S1 Any SPST Toggle Switch
F1 3 Amp Fast Blow Fuse
D1-D4 Full Wave Bridge Rectifier (RS276-1185)
T1 18 Volt, 10 Amp Transformer Hammond #165S18 (Digi-Key HM538-ND)

6V/3W Bicycle Generator System Circuit

2009-11-29T15:21:00.000-08:00

6V/3W Bicycle Generator System Circuit

This is a regulator for a 6V/3W bicycle generator system. The purpose is to switch to rechargeable batteries when the generator is idle. In addition, the device limits the voltage across the bulbs when the generator operates at a high speed. As you can see, the circuit is purely electrical. In the presented design, the switch has been moved, compared to the original to a location where the switch better functions under different circumstances. I kept the regulator on the bike for 2 years during which the circuit operated fairly satisfactorily. Thereafter, I moved on to an electronic regulator optimized for the operation with a hub dynamo.

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3000 - 6000 MHz / 50 Watts High Power Amplifier

2009-11-29T15:17:00.000-08:00

The BBS26A8CHM ruggedized amplifier system is our latest in microwave solid-state amplifiers. This compact and lightweight system features high power output and excellent efficiency. This amplifier utilizes high power GaN devices. It fits in standard 19-inch equipment racks, weighs less than 70 lbs and is available with or without touch-screen LCD control, Ethernet connectivity and a full range of other options including 400 Hz aircraft power.

Download Datasheet..

High Voltage Generator|Solid State Tesla Coil

2009-11-29T15:12:00.000-08:00

High Voltage Generator|Solid State Tesla Coil Circuit

Notes

1. T2 is a high voltage flyback transformer salvaged from an old TV, or ordered from Fair Radio Sales (see Where To Get Parts). Look for the biggest, most intimidating transformer you can find. Old tube TV's are a good place to look. The transformer should not have a rectifier built in.

2. You will need to rewind the transformer's primary. First, remove the old primary, being careful not to damage the high voltage secondary. If the transformer is wound with all windings incased in plastic, use another transformer. Second, wind on 5 turns of 18 AWG wire, twist a loop (center tap), and then wind on 5 more turns. This becomes winding C-D. Now, wind on 2 turns of 22 AWG wire, twist a loop, and wind on 2 more turns. This becomes winding A-B.

3. Q1 and Q2 will run HOT if not used with a large heatsink. After the circuit has been running for a minute or two, you should still be able to put your finger on the transistors without being burnt. Also, R1 and R2 will run hot.

4. If you experience arcing on the exposed transformer leads, select a lower voltage for T1. If you are powering the circuit with a power supply (see Power Supply), just crank down the voltage.

5. For a real high voltage output, connect a voltage multiplier (from an old TV or computer monitor) to the output of T2.

6. If the circuit does not work, reverse connections A and B.

Parts,Total Qty,Description and Substitutions here :

R1 1 27 Ohm 5W Resistor 27 Ohm 10W Resistor
R2 1 240 Ohm 5W Resistor 240 Ohm 10W Resistor
BR1 1 50 Volt, 6 Amp Bridge Rectifier
C1 1 8000uf, 35 Volt Capacitor
Q1, Q2 2 2N3055 NPN Power Transistor
T1 1 24V 5A Transformer (See "Notes")
T2 1 TV Flyback Transformer (See "Notes")
S1 1 115V 3A SPST Switch
MISC 1 Case, Wire, Heatsinks, Line Cord

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Laser Power Supply Circuit Schematic

2009-11-29T15:11:00.001-08:00

Notes

1. T1 is an ordinary 9V 1A transformer connected backwards for step up.

2. R1 MUST be installed on a LARGE heatsink. A good heatsink is the metal case the supply is built in.

3. R2 Protects the laser tube from excess current. It should be soldered directly to the anode terminal on the tube. To find R2, start with a 500K 10W resistor and work down until the tube lights and remains stable.

4. If you have trouble with the tube not starting easily, use a longer anode lead that is wrapped around the tube.

5. Depending on the transformer you use, the circuit may or may not work. I cannot guarantee the operation of this circuit. Build at your own risk. Some transformers contain very few secondary windings which will quickly saturate the core and basically act like a direct short. The more secondary windings (that is, primary in this circuit) the better.

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Transformerless Power Supply Circuit

2009-11-29T15:07:00.001-08:00

Transformerless Power Supply Circuit

If you are not accomplished in ambidextrous with it, again leave this activity alone.Although Mains accessories can itself absorb a lot of current, the circuits we body to ascendancy it, usually alone crave a few milliamps. Yet the low voltage ability accumulation is frequently the better allotment of the architecture and a abundant allocation of the cost.

This ambit will accumulation up to about 20ma at 12 volts. It uses capacitive reactance instead of resistance; and it doesn't accomplish actual abundant heat.The ambit draws about 30ma AC. Always use a agglutinate and/or a aqueous resistor to be on the safe side. The ethics accustomed are alone a guide. There should be added than abundant ability accessible for timers, ablaze operated switches, temperature controllers etc, provided that you use an optical isolator as your circuit's achievement device. (E.g. MOC 3010/3020) If a broadcast is unavoidable, use one with a mains voltage braid and about-face the braid application the optical isolator.C1 should be of the 'suppressor type'; fabricated to be affiliated anon beyond the admission Mains Supply. They are about covered with the logos of several altered Safety Standards Authorities. If you charge added current, use a beyond amount capacitor; or put two in parallel; but be accurate of what you are accomplishing to the Watts. The low voltage 'AC' is supplied by ZD1 and ZD2.

The arch rectifier can be any of the baby 'Round', 'In-line', or 'DIL' types; or you could use four abstracted diodes. If you appetite to, you can adapt R2 and ZD3 with a 78 Series regulator. The abounding sized ones will work; but if amplitude is tight, there are some baby 100ma versions accessible in TO 92 blazon cases. They attending like a BC 547. It is additionally account acquainted that abounding baby circuits will assignment with an able supply. You can, of course, adapt any or all of the Zenner diodes in adjustment to aftermath a altered achievement voltage. As for the mains voltage, the advancement apropos the 110v adaptation is aloof that, a suggestion. I haven't congenital it, so be able to agreement a little.

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110VAC Car Inverter Circuit

2009-11-29T14:57:00.000-08:00

110VAC Car Inverter Circuit

This circuit will allow you to operate small devices like laptop computers inside your automobile without an expensive automobile power supply. The circuit takes advantage of the fact that power transformers are linear devices and can be used to step up as well as step down. This is evident by the fact that the supply drives the secondary and the output is on the primary.

Warning: this supply produces dangerous and lethal voltages. Use extreme caution when testing this circuit. In addition, make sure the assembly is enclosed in a plastic case. Do not package this circuit in a metal or aluminum case!

The design depends on the windings ratio and the value of the car battery to produce an AC waveform of approximately 95 volts RMS. No filtering is performed on the secondary since the transformer blocks most of the sharp edges from the input waveform.

All of the devices (14013, 555, 14020, and 4049) should have their supply pins connected to the +12 supply. The nice thing about CMOS logic is that it will operate over a wide range of voltages. Before connecting the center tap of the transformer, adjust R3 until the signal on U5 pin 13 is 120Hz.

The 14013's are used to produce a 60Hz square wave with an accurate 50% duty cycle and to force the FET switches operate in a break-before-mate manner. The 4049's have enough drive capability to snap the FET's off and on very quickly.

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DC Power Supply Dual-rail Variable Circuit

2009-11-27T17:50:00.000-08:00

DC Power Supply Dual-rail Variable Circuit

* The circuit can be placed into the existing Variable DC Power Supply metal cabinet.

* Q1 and Q2 must be mounted on heatsinks. Usually, bolting them to the metal case (through insulating washers etc.) proved effective.

* The full ±15V output can be achieved only if the secondary winding of the supply Transformer used in the Variable DC Power Supply is rated at 48V minimum (center tapped).

* When using this circuit, please set the Current-limit control (P1) of the Variable DC Power Supply to any value comprised in the 50mA - 1A range but not higher.

* The second Op-amp (IC1B) contained in the LM358 chip was not used, but its input pins were tied to the negative supply and the output was left open.

DC Power Supply Dual-rail Variable Part list:

R1 = 4.7K-1/2W
R1 = 4.7K-1/2W
C1 = 100nF-63V
C2 = 220µF-25V
C3 = 220µF-25V
C4 = 100nF-63V
C5 = 100nF-63V
Q1 = BD437
Q2 = BD438
IC1 = LM358

Regulator Power Supply 1A Circuit Schematic

2009-11-27T17:47:00.000-08:00

Regulator Power Supply 1A Circuit Schematic

Small power supply that provides a regulated voltage, adjustable between 1.5 and 35 volts at 1 ampere. This circuit is ready to use, you just need to add a suitable transformer. This circuit is thermal overload protected because the current limiter and thermal overload protection are included in the IC.

This is the Regulator Power Supply 1A Part List :

IC = LM317
P1 = 4.7K
R1 = 120R
C1 = 100nF - 63V
C2 = 1uF - 35V
C3 = 10uF - 35V
C4 = 2200uF - 35V
D1-D4 = 1N4007

iPod Battery Charger Circuit Diagram

2009-11-27T17:44:00.000-08:00

iPod Battery Charger Circuit Diagram

This is the iPod Battery Charger Part list:

P1 = 1K
R1 = 1R-0.5W
R2 = 1R-0.5W
R3 = 1R-0.5W
R4 = 1K
R5 = 560R
R6 = 10R-0.5W
R7 = 470R
C1 = 470uF-25V
C2 = 100nF-63V
C3 = 470pF
C4 = 100uF-25V
D1 = 1N5404
D2 = TVS1P6KE27A
D3 = 1N5819
D4 = 5.1V-1W Zener Diode
D5 = 5mm. Red LED
L1 = 220uH
S1 = USB 'A' Type Socket
SW1 = On/Off Switch
IC1 = MC34063A

Using the USB port on your computer to charge your player’s batteries is not always practical. What if you do not have a computer available at the time or if you do not want to power up a computer just for charging? Or what if you are traveling? Chargers for Mobile Phones iPods and MP3 players are available but they are expensive and you need separate models for charging at home and in the car.
This charger can be used virtually anywhere. While we call the unit a charger, it really is nothing more than a 5V supply that has a USB outlet. The actual charging circuit is incorporated within the iPOD or MP3 player itself, which only requires a 5V supply. As well as charging, this supply can run USB-powered accessories such as reading lights, fans and chargers, particularly for mobile phones.
The supply is housed in a small plastic case with a DC input socket at one end and a USB type "A" outlet at the other end, for connecting to Mobile Phone, an iPod or MP3 player when charging. A LED shows when power is available at the USB socket. Maximum current output is 660mA, more than adequate to run any USB-powered accessory.

Universal Battery Charger Circuit

2009-11-27T17:40:00.000-08:00

Universal Battery Charger Circuit Part List:

R1 = 120R-0...5W
R2 = See Diagram
C1 = 220uF-35V
D1 = 1N4007
D2 = 3mm. LED
Q1 = BD135
J1 = DC Input Socket

This is circuit diagram of a low cost universal charger for NiCD - NiMH batteries. This circuit is Ideal for car use. It has ability to transform a mains adapter in to a charger . This one can be used to charge cellular phone, toys, portables, video batteries, MP3 players, ... and has selectable charge current. An LED is located in circuit to indicate charging. Can be built on a general purpose PCB or a veroboard. I hope you really like it.

PORTABLE SOLAR CHARGER CIRCUIT DIAGRAM

2009-11-23T16:30:00.000-08:00

Here we see the front panel. The left meter reads the battery voltage, and the right reads charging current. The center switch selects which of the batteries is currently in the circuit. In this case, we see that the NiCad D-cells are in the circuit, that the voltage applied is about 2.5 volts, and the charging current is about 25 mA (from ambient indoor light)

Finally, here's a schematic of the electrical hook-up. The circuitry for charging batteries is unregulated, and depends on the operator to disconnect the battery before it gets overcharged. The circuitry for the NiCads is an especially crude regulator, but it keeps the batteries from over-charging. Here, two series silicon rectifiers limit the voltage to about 1.3- 1.4 Volts (1.43 Volts is about ideal for a NiCad to terminate charge), A planned improvement is to add real regulators so that over-charging cannot occur. A 14 Volt fixed-voltage-regulator would be ideal for the lead-acid battery, and maybe something a little more sophisticated for the NiCads.

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NE555 Voltage Controller Swiching Circuit

2009-11-23T16:22:00.000-08:00

The old and all-knowing NE555 can be actual acceptable at article it was not meant for: active relays or added endless up to 200 mA. The account shows an archetype circuit: if the ascribe akin rises over 2/3 of the accumulation voltage - it will about-face on the relay, and the broadcast will break on until the akin at the ascribe drops beneath one third of the accumulation voltage.

If the broadcast and D1 were affiliated amid pin 3 and ground, the broadcast would be activated back the ascribe voltage drops beneath one third, and deactivated back the ascribe voltage goes over two thirds of the accumulation voltage.

It is additionally a nice advantage that the ascribe requires alone about 1 uA, which is article bipolar transistors can't attempt with. (This aerial impedance ascribe charge not be larboard open.) A ample hysteresis makes the ambit allowed to noise. The achievement (pin 3) can alone be either aerial or low (voltage-wise), and it changes its accompaniment about instantenously, behindhand of the ascribe arresting shape.

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The voltage bead beyond the NE555's achievement date (at 35-100 mA) is 0.3-2.0 V, depending on the way the broadcast is affiliated and the exact accepted it draws. D1 is actually basic to the assurance of the chip circuit.

CAR POWER FILTER REGULATOR USING LM1084

2009-11-23T16:01:00.000-08:00

When you advance to comedy MP3 or laptop computer appear to administer to an automobile. Sometimes may built-in babble botheration has from electricity auto system. I thinks Power Clarify Regulated for car by LM1084-12 may advice break a botheration this get. Because of application way LC clarify and IC LM1084-12 (5A Low Dropout Positive Regulators) as a aftereffect can advice adapt voltage well. If there is beat babble 12V added although a little aloof will change this ambit has a little. And this ambit still can accord the trend alpine arrives at 5A can administer to the accessories awning very.

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RANGKAIAN CONVERTER AC 12VDC-220VAC

2009-11-23T15:58:00.000-08:00

CMOS 4047 is the capital basic of this baby voltage advocate which transforms a 12V dc into 220V ac. 4047 is acclimated as a astable mutivibrator, at pins 10 and 11 will accept a balanced ellipsoidal arresting wich is amplified b 2 Darlington transistors and assuredly ability the accessory braid of mains agent ( 2×10V / 60VA ).

At the capital braid terminals will get 220V. With the advice of P1 the achievement frequnecy can be adapted amid 50Hz to 400Hz. Although this is not allotment of any able dc ac converters it can be acclimated absolutely able on some home appliances.

RANGKAIAN INVERTER 12 VOLT UNTUK SOLDER

2009-11-23T15:56:00.000-08:00

Here is a simple 12 V inverter for application a baby soldering adamant (25W, 35W, etc) in the absence of mains supply. It uses eight transistors and a few resistors and capacitors. Transistors T1 and T2 (each BC547) anatomy an astable multivibrator that produces 50Hz signal. The commutual outputs from the collectors of transistors T1 and T2 are fed to pnp Darlington disciplinarian stages formed by transistor pairs T3-T5 and T4-T6 (utilising BC558 and BD140). The outputs from the drivers are fed to transistors T7 and T8 (each 2N3055) affiliated for push-pull operation. Use acceptable heat-sinks for transistors T5 through T8.

230V AC primary to 12V-0-12V, 4.5A accessory agent (X1) is used. The centre-tapped terminal of the accessory of the agent is affiliated to the array (12V, 7Ah), while the added two terminals of the accessory are affiliated to the collectors of ability transistors T7 and T8, respectively.

When you ability the ambit application about-face S1, agent X1 produces 230V AC at its primary terminal. This voltage can be acclimated to calefaction your soldering iron. Assemble the ambit on a accepted purpose PCB and abode in a acceptable cabinet. Connect the array and agent with acceptable current-carrying wires. On the advanced console of the box, fit ability about-face S1 and a 3-pin atrium for abutting the soldering iron.

Power Supply Adjustable 0-30V

2009-11-23T15:22:00.000-08:00

The aboriginal affair you charge accept in your workshop/lab is ability supply. In experimenting abounding new cyberbanking ambit design, it is easier if you accept a adjustable adjustable ability supply. Here is an adjustable 0-30 volts ability accumulation design. The ambit schematic diagram is apparent below.

The amount of the ambit is 723 voltage regulator chip circuit. A Darlington brace Q2 Q3 addition the accepted to accord 1A output. The minimum voltage acclimation for this regulator IC is 2 volts aloft V-. Aught volt is accomplished by bartering the V- with a voltage beneath -2V, so the achievement can be adapted to zero. The abrogating accumulation is provided by the apparatus about D3 and D4, counterbalanced by 5.1 Zener diode.

The capricious resistor R3 is acclimated to set the accepted limiter, so your ability accumulation will be save alike back you abbreviate its achievement to ground. To set the aught point, about-face the R11 potentiometer to minimum (counter clockwise) and acclimatize the R12 trimmer potentiometer until the achievement is zero. After this setting, axis the R11 potentiometer to the best will accord about 30V output. If at the best position the achievement is abate than 30V, it’s acceptable acquired by the apparatus tolerance, you can lower the R10 value. Make abiding you use beyond clue for arena affiliation on the PCB, and accommodate acceptable calefaction bore for Q3.

The parts list:

Item	Quantity	Reference	Part
1	1	C1	470uF/63V
2	1	C2	470uF/40V
3	1	C3	2200uF/63V
4	1	C4	100uF/35V
5	1	C5	1nF
6	1	D1	5V1
7	1	D2	33V
8	4	D3,D4,D5,D6	1N4001
9	1	D7	DIODE BRIDGE
10	1	D8	LED
11	1	F1	1.5A
12	1	J1	PLUG AC MALE
13	1	Q1	BC557B
14	1	Q2	BC141
15	1	Q3	Q2N3055
16	1	R1	560R
17	1	R2	2k2/1W
18	2	R3,R5	2k2
19	2	R10,R6	1k2
20	1	R8	100R
21	1	R9	0R33/1W
22	1	R11	POT 10k
23	1	R12	VR 10k
24	1	R13	VR 1k
25	1	T1	30V 1A
26	1	U1	LM723