How to make 12 Volt dc variable power supply || Power supply by using LM7812 IC

Introduction

In this blog, I will tell about the 12-volt DC power supply. How its work circuit diagram and the final result of power supply.

I designed a 220 AC to 12-volt variable filtered power supply by using the LM7812 Voltage regulator

Components

Transformer 220 to 12 volt Ac Stepdown

4X 1N4001 diodes

1xLM7812

1x1k ohm Resistor

1000uf Capacitor

220 volt Ac supply

Circuit Diagram



 Working Principle

The working principle of this circuit is that the input you apply to this circuit is 220 volt Ac in step down Transformer 220 to 12 volt then make a bridge of 1N4001 diodes Diode is an Active component that converts AC source into Dc source. Then place a voltage regulator LM7812. 



This voltage regulator is used for filtration and for fixed output. LM7812 is a three-terminal device. The first pin is for input, the second pin is grounded and the third pin is an output pin. For variable supply, we use a 50k potentiometer.



The potentiometer is a Three terminal device The two pins are used for input voltage and ground pin and the center pin is used for variable output.

On the output pin of the potentiometer connect a 1k Ohm resistor and for filtration, we connect the 1000uf capacitor.

The 12-volt dc power supply is ready now you can take the output from the capacitor.

Application

Arduino project

Universal Trainer

Electronics Circuit projects

Waveform



Output



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