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Power supplies circuit diagrams

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.

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.
[View Simple Adjustable Voltage Source circuit diagram]

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 established with a resistor placed in series with the 317 input and a resistor placed in series with the emitter of the pass transistor.
[View LM317T Voltage Regulator with Pass Transistor circuit diagram]

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 also has built in current limiting and thermal shutdown which makes it essentially blow-out proof.
[View LM317T Variable Voltage Regulator circuit diagram]

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 simply say that they are bad.
[View Flyback Transformer Driver circuit diagram]

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.
[View 2500W Phase Control circuit diagram]

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 like fridge and air conditioners. If a fridge is operated on low voltage, excessive current flows through the motor, which heats up, and get damaged.
[View High And Low Voltage Cut Off With Time Delay circuit diagram]

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 cycle can be varied from 0 to 100 per cent by R4 potentiometer.
[View Solid State Power Controller circuit diagram]

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 components of this circuit are REGULATORS.
[View Dual Voltage Power Supply circuit diagram]

NiCd - NiMH Charger

The charger is build around a LM317 adjustable regulator.
[View NiCd - NiMH Charger circuit diagram]

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. When a battery is improperly charged or allowed to self-discharge as occurs during non-use, sulphate crystals build up on the battery's plates.
[View Pulse Charger for reviving Lead Acid batteries circuit diagram]

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 of over-voltage that can destroy TTL chips is much too brief to trigger any conventional fuse, so that only other semiconductor circuits can play any useful part in protecting a circuit against the type of failure of a stabilizer that leads to excessive voltage.
[View TTL Power Supply with Crowbar protection circuit diagram]

500W low cost 12V to 220V inverter

Using this circuit you can convert the 12V dc in to the 220V Ac.
[View 500W low cost 12V to 220V inverter circuit diagram]

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 panel has been replaced by a FET-comparator combination. The charger will stop charging once a pre-set voltage (temperature compensated) has been reached, and recommence charging when the voltage has dropped off sufficiently.
[View Solar charger for lead-acid batteries circuit diagram]

0-50V 2A Bench power supply

Variable voltage power supply for laboratories. With two ICs can take different output voltage and amperage.
[View 0-50V 2A Bench power supply circuit diagram]

Voltage Inverter II

This simple and inexpensive circuit can produce a dual voltage from a single supply input.
[View Voltage Inverter II circuit diagram]

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 inverts it. It uses only one 555 timer and a few other passive components, so it doesn't add much in the way of size and cost to a project.
[View Voltage Inverter circuit diagram]

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 the laser tubes are often more expensive then the tubes themselves.
[View LASER Power Supply circuit diagram]


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.
[View Inverter circuit diagram]

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 it outputs is dependant only on the regulator and transformer you choose. The maximum output current is 1.5A.
[View Fixed Voltage Power Supply circuit diagram]

Variable DC Power Supply

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


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. It's ideal for just about any application.
[View LM317 VARIABLE POWER SUPPLY circuit diagram]

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, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA. This circuit is also known as an amplified zener circuit.
[View Regulated 12 Volt Supply circuit diagram]

Nicad Battery Charger

This simple charger uses a single transistor as a constant current source.
[View Nicad Battery Charger circuit diagram]

Dual Regulated Power Supply

In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply.
[View Dual Regulated Power Supply circuit diagram]

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.
[View Basic UPS Power Supply circuit diagram]

Ni -Cd Batteries Charger

The NiCd charger takes approximately 12-15 hours of charge at 50mA (For AA-batteries).
[View Ni -Cd Batteries Charger circuit diagram]

Fuse Monitor - Alarm

This device monitors a fuses in your circuits. LED turns on when fuse is blown.
[View Fuse Monitor - Alarm circuit diagram]

Rectification using a Gyrator Circuit

Current rectifier for large loads without large capacitors. It uses transistor 2N3055 as an active component.
[View Rectification using a Gyrator Circuit circuit diagram]

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.
[View Variable Power Supply circuit diagram]

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 designed to operate on 230V. threshold current is adjustable.
[View Fast Electronic Fuse circuit diagram]

Soft Start PSU

Two soft start power supply.
[View Soft Start PSU circuit diagram]

12 Volt 30 Amp PSU

12 Volt 30 Amp power supply unit circuit diagram
[View 12 Volt 30 Amp PSU circuit diagram]

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
[View 13 Volt 20 Amp PSU circuit diagram]

High Current Power Supply

High current power supply circuit diagram with 2n3055. Voltage is stabilised.
[View High Current Power Supply circuit diagram]

Dual Polarity Power Supply

This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts.
[View Dual Polarity Power Supply circuit diagram]

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.
[View Portable CD Player Adapter For Car circuit diagram]

6V to 12V Converter

This inverter circuit can provide up to 800mA of 12V power from a 6V supply
[View 6V to 12V Converter circuit diagram]

Transformerless Power Supply

This supply uses no heavy step down transformer and has an extremely low parts count.
[View Transformerless Power Supply circuit diagram]

..:: Important ::..

Read disclamer, please!


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