Regulated Dual Power Supply

Regulated Dual Power Supply

In this article, you will learn how to make a regulated dual power supply that generates regulated +12v and -12v from AC mains supply. This type of supply is very much required while we are using op-amps. Since op-amps are used in many analog circuits, this regulated power supply will help you to test and use with the op-amps circuits. Each output of this circuit is capable of delivering an output of 250mA.

Regulated Dual Power Supply Circuit:

regulated power supply

Working of Circuit:

The unregulated mains supply consists of a transformer T1 that steps down the mains AC supply to 15V AC individually across the two halves of the center tap with positive and negative polarities. Diodes D1 to D4 forms a full wave rectifier which converts the AC to DC. The Capacitors C1 and C2 are used to filter the rectified output, whereas C3 to C8 are decoupling capacitors. Here IC1 is a fixed output positive regulator and IC2 is a negative regulator.

Components Required:

Diodes

D1,D2,D3,D4  :  1N4001

ICs

IC1 : 7812

IC2 : 7912

Capacitors

C1, C2     : 1000uF,50V

C3,C4,C7,C8 : 0.1uF

C5,C6 : 10uF,50V

Other

Transformer T1 : 15-0-15 volts, 250mA mains transformer.

Fuse F1 : 500mA tubular with Holder.

Switch SW1: Mains ON/OFF Switch.

5V Regulated Dual Powe Supply

Desired Output: +5V,-5V

Transformer T1: 7.5-0-7.5,250mA.

IC1: 7805

IC2: 7905

9V Regulated Dual Powe Supply

Desired Output: +9V,-9V

Transformer T1: 12-0-12,250mA.

IC1: 7809

IC2: 7909

15V Regulated Dual Powe Supply

Desired Output: +15V,-15V

Transformer T1: 15-0-15,250mA.

IC1: 7815

IC2: 7915

18V Regulated Dual Powe Supply

Desired Output: +18V,-18V

Transformer T1: 18-0-18,250mA.

IC1: 7818

IC2: 7918

24V Regulated Dual Powe Supply

Desired Output: +24V,-24V

Transformer T1: 24-0-24,250mA.

IC1: 7824

IC2: 7924

 

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