HEP CB Zero: Variable Power Supply Basics

 Heres the basics of Adjustable Power Supply, Not the Best but potentionally great. LM317 doesn't work easily nowadays and no formula derivation...

Notice: Burning due to Power of Potentiometer, try rheostat...Add Transistor will help, any Current for the Load, ANY.

Vb = Vin R2/(R1+R2)

HOPE THIS HELPS!!!