AC TO DC /Rectifier Power supply

Variable Power Supply using LM317 1.5 – 15v dc

Introduction to variable voltage regulator :

A variable power supply unit is a very useful tool that provides the constant derived voltage output with constant current rated by the unit. A variable power output tool is a necessity for electrical and electronics hobbyists and professional work.These are circuits built using active and passive components(diodes,transistor,capacitors,resistors,ICs,etc.

HOW TO USE LM317 the variable voltage regulator 

Here I will tell you how to make a simple variable power supply using an LM317 variable voltage regulator. This is a variable voltage regulator with TO-220 PCB packaging.

variable power supply
this image credit goes to google

It has 3 pin terminals:- ADJ, Vout, Vin.


  • Transformer 12v-15v 1Amp to 2Amp
  • LM317K-1Pcs
  • (D1,D2,D3,D4) 1N4007  – 4 Pcs
  • C1 3300uf-1pcs
  • C2 330nf – pcs
  • C3 100uf – 1pcs
  • R1 10K – 1pcs
  • RV1 2K – 1pcs
  • D5 1N5400 – 1pcs

 Circuitry for LM317 Variable Power supply

variable power supply

Guys if you like it, then please comment it below and for any doubts or suggestions, you people can comment below.

I have added this video below please watch it for more ing=fo and reffre=nce to make and check the working.


Content Protection by
Aabhishek Sharma is a Computer Science Engineer and a Digital Marketing Trainer and Consultant. Aabhishek Sharma also loves working on Electronics Projects and working with microcontrollers and Designing Home automation Gadgets.

Leave a Reply

Your email address will not be published. Required fields are marked *