LM317 Variable Voltage Power Supply

Description:
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 **

Schematic:


PCB:


Silk screen / part layout:


Useage:

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..

Downloads:

Schematic - GIF - 4K
PCB - GIF - 3K
Silk Screen / Parts layout - GIF - 4K

Schematic - Eagle file - 145K
PCB Layout - Eagle file - 8K

Links:
www.national.com
www.onsemi.com
LM317 Datasheet