POWER CIRCUITS and PROJECTS
Gyrator Circuit
An electronic recitification circuit. The use of large, heavy and expensive electrolytic capacitors is avoided, being replaced by an active transistor in this gyrator circuit.
L200 PSU
Power supply with voltage and current regulation built with the L200C regulator.
12 Volt 30amp Supply
Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps.
Regulated 12 Supply by Mick Devine
A basic regulated 12 Volt power supply
Fuse Blown Indicator
The idea for this project may have come to me in a flash of inspiration, and its a very simple way to check if a fuse has blown without removing it from its holder.
Unregulated Power Supply
A basic full wave rectified power supply is shown below. The transformer is chosen according to the desired load. For example, if the load requires 12V at 1amp current, then a 12V, 1 amp rated transformer would do.
Dual Regulated Power Supply
simple dual regulated power supply
Boosting Regulator Current
An outboard pass transistor used to increase the current output of a voltage regulator IC.
Variable Power Supply
A variable power supply with adjustable voltage and current outputs made with the L200 regulator.
Transformerless Power Supply by Ron J
This power supply is directly connected to line voltage source without any step down transformer.
this project requires electrical and electronic knowledge and not for beginners.
Universal DC-DC Converter
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.
Variable Regulator Output by Ron J
the output voltage of this power supply is controlled by a voltage regulator IC
LM317 Regulator Circuit by Matthew Hewson
this voltage regulator to power my two way mobile radio from the car cigarette lighter circuit. It has many other uses and the voltage can easily be adjusted by the use of a potentiometer.
Basic UPS
This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt power supply.
Alarm Power Supply
A 12 Volt power suppiled designed for Ron's Modular Burglar Alarm. However, being a popular supply voltage this circuit will have many other uses as well.
13.8V 20A Power Supply Unit by Bob
This is a Regulated DC power supply with short circuit protection and with current limiter.
Current Limiting Power Supply
This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.
Supply Voltage Indicator
A novel supply voltage monitor which uses a LED to show the status of a power supply.
Small Variable power Supply
Features: 1.3-12.2 V, 1 A, over-current protection. This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the LM723.
Soft Start power Supply by Miroslav Adzic
Two soft start power supplies. The output voltage slowly increases to the desired output.
1.3 Volt Power Source
This is a replacement power source for 1.3V mercury cells or other small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital thermometer.
Variable Power supply by David Celestin
This is a similar power supply that I used to power my FM Transmitter. After suffering long problems with mains hum, this design using a pi filtered C-L-C approach. This circuit offers excellent ripple rejection.
Adjustable Power Supply with Charger by Milardo de Guzman
This power supply has adjustable and charger output. The charger circuit can be use for cellular phone. The adjustable output serves as multipurpose power supply. It can handle a 1 ampere current. The 317 must have a heat sink.
cheap 6-12V converter
This electronic project is a 6-12V dc-dc converter that is easy to assemble.
3V Charger project
This simple charger uses 2 AA or AAA 1.5v battery.It is easy to construct and electronic componenets are very cheap .This is can be used to charge your celphones, ipod or mp3 players.
1V Charger project
This project is another version of portable travel charger that uses only a AA or AAA 1.5v battery.Electronic parts are minimal and this elctronic project is very cheap and very easy to construct.
6 to 12 Volt Converter
This circuit can provide up to 800mA of12V power from a 6V supply. The circuit is simple, about 75% efficient and quite useful.
One 9 Volt Battery gives +18, +25, +33V
This power supply circuit is based on MAX1044 is a charge pump converter
Transformerless Mains Power Supply
This power supply does not really excel in power efficiency, but it is the cheapest and most compact solution for a small power supply. Note that the low voltage output is directly connected to the mains
Transformerless Power Supply
The circuit can be built very small and can supply small currents for small projects. The major downfall of this supply is that it is not isolated from the AC line and can only supply small currents.
0 to 300 Volt Adjustable Power Supply
This is a simple circuit that can provide an adjustable voltage source of0 to330 Volts. The supply is short-circuit proof: the current is limited to about100mA.
4k Volt 5k Volt 2000VAC Power Supply
uses two microwave oven transformers
LASER Power Supply
this high voltage power supply for the laser tubes can be built with commmon parts, most of which you probably already have in your junk box.
High Voltage Adjustable Power Supplies by National Semiconductor
Low Current, High Voltage Power Supply
Super Cheap 1500 Volt Power Supply (small Laser Supply)
This little power supply uses an ordinary 120VAC to 9VAC step-down transformer to deliver 1500Vrms.
555 timer as a switch-mode power supply
The circuit shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation. The design uses two 555s
12 Volt, 10 Amp Switching Power Supply
The switching power supply, shown in the schematic, provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit.
Adjustable Power Supply
well filtered variable1.2-30 volts at5 amps using LM338K
LM317 VARIABLE POWER SUPPLY
a workbench power supply that can be varried from 1.25V to 25V