Variable Voltage Power Supply
The LM317 is a three-pin regulator chip capable of using a standard potentiometer to vary voltage from 1.2VDC to 34VDC. The circuit is very simple to build and delivers very clean power at up to 1.5A.
** CHIP MUST BE HEATSUNK **
Silk screen / part layout:
Chip MUST be Heatsunk
Connect a positive DC voltage to pad 1 and the ground to pad 2. Pad 3 is the postive output and pad 4 is the negative output..