LM317 LM337 Adjustable Positive And Negative Voltage Regulated Power Supply

This is in addition to our previous LM317 LM337 power supply.. minor change in removing one of the resistors and substituting it for a 5k trimpot.

You will need a centre tapped transformer to get the negative voltage to regulate eg 15v-0v-15v etc

Etch at Home Files available HERE

C1 & C2 1000uf 50v

R1 & R3 5k 25 turn trimpot

All Diodes 1n4004

Rectifier KBP01

All other capacitors rated at 25v – use larger voltage if you are going to regulate 18-24v or higher.

Schematic for psu
Tested and working layout.
Assembled Board