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.
It has 3 pin terminals:- ADJ, Vout, Vin.
- Transformer 12v-15v 1Amp to 2Amp
- (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
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I have added this video below please watch it for more ing=fo and reffre=nce to make and check the working.