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Power supplies electronic circuits

You need a power supply for your laboratory? Here are some electric diagrams of several types of power supply: high power, stabile voltage, battery charger, variable voltage etc.

0-50V 2A Bench power supply

Variable voltage power supply for laboratories. With two ICs can take different output voltage and amperage.... [read]

12 Volt 30 Amp PSU

12 Volt 30 Amp power supply unit circuit diagram... [read]

13 Volt 20 Amp PSU

This is a Regulated DC power supply with short circuit protection and with current limiter. It delivers safely around 20Amps at 13.8V... [read]

2500W Phase Control

This circuit controls resistive and inductive loads up to 2,500W. Its main functional device is an integrated phase control circuit - Siemens TLE3103.... [read]

500W low cost 12V to 220V inverter

Using this circuit you can convert the 12V dc in to the 220V Ac.... [read]

6V to 12V Converter

This inverter circuit can provide up to 800mA of 12V power from a 6V supply... [read]

Basic UPS Power Supply

This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply.... [read]

Dual Polarity Power Supply

This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts.... [read]

Dual Regulated Power Supply

In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply.... [read]

Dual Voltage Power Supply

The following circuit Diagram of (DUAL VOLTAGE POWER SUPPLY ) can be used for Misc.. application. It requires a few components to built. The most important... [read]

Fast Electronic Fuse

This circuit is based on simple Ohms law. It uses voltage drop on a resistor to determine current strength and turns device off if it's to high. Circuit is... [read]

Fixed Voltage Power Supply

The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage... [read]

Flyback Transformer Driver

This is an efficient flyback driver for modern cylindrical rectified television flybacks. Many sites doesn't provide circuits driving these transformers, they... [read]

Fuse Monitor - Alarm

This device monitors a fuses in your circuits. LED turns on when fuse is blown.... [read]

High And Low Voltage Cut Off With Time Delay

The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances... [read]

High Current Power Supply

High current power supply circuit diagram with 2n3055. Voltage is stabilised.... [read]


Have you ever wanted to run a TV, stereo or other appliance while on the road or camping? Well, this inverter should solve that problem.... [read]

LASER Power Supply

If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be. The high voltage power supplies for... [read]


A truly timeless circuit. LM317 is a versatile and highly efficient 1.2-37V voltage regulator that can provide up to 1.5A of current with a large heat sink.... [read]

LM317T Variable Voltage Regulator

The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device... [read]

LM317T Voltage Regulator with Pass Transistor

The LM317T output current can be increased by using an additional power transistor to share a portion of the total current. The amount of current sharing is... [read]

Negative Supply from single positive Supply

Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in fields where a dual... [read]

Ni -Cd Batteries Charger

The NiCd charger takes approximately 12-15 hours of charge at 50mA (For AA-batteries).... [read]

Nicad Battery Charger

This simple charger uses a single transistor as a constant current source.... [read]

NiCd - NiMH Charger

The charger is build around a LM317 adjustable regulator.... [read]

Portable CD Player Adapter For Car

Portable CD Player Adapter For Car. Changes 12V voltage from your car, to 9 or less volts for cd player or some other device.... [read]

Pulse Charger for reviving Lead Acid batteries

If you own a motorcycle, a motor home, a caravan, a lawn mover, a day cruiser or maybe a vintage car you must at some point had to write off a lead acid battery.... [read]

Rectification using a Gyrator Circuit

Current rectifier for large loads without large capacitors. It uses transistor 2N3055 as an active component.... [read]

Regulated 12 Volt Supply

This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Aprroximately 0.7 Volts are dropped across the transistors b-e junction,... [read]

Simple Adjustable Voltage Source

A simple but less efficient method of controlling a DC voltage is to use a voltage divider and transistor emitter follower configuration.... [read]

Soft Start PSU

Two soft start power supply.... [read]

Solar charger for lead-acid batteries

This circuit is intended for charging lead-acid batteries with a solar panel. The customary diode that prevents the battery from discharging through the solar... [read]

Solid State Power Controller

The ckt is built around two 555 timer ICs. U1 and U2. U1 is wired as a variable duty cycle oscillator with a constant time period of around 0.1 second. Duty... [read]

Transformerless Power Supply

This supply uses no heavy step down transformer and has an extremely low parts count.... [read]

TTL Power Supply with Crowbar protection

Power supplies that are intended to be used with TTL logic circuitry must guard against over-voltage, which can destroy TTL chips very rapidly. The duration... [read]

Variable DC Power Supply

A Variable DC Power Supply is one of the most useful tools on the electronics hobbyist's workbench.... [read]

Variable Power Supply

Using the versatile L200 voltage regulator, this power supply has independent voltage and current limits. Voltage output from about 3 to 15 volts.... [read]

Voltage Inverter

This simple circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and... [read]

Voltage Inverter II

This simple and inexpensive circuit can produce a dual voltage from a single supply input.... [read]