ATX breakout board bench power supply

Description

Recycle an ATX computer power supply into a beefy bench tool that powers your projects. The ATX breakout board routes the -12, 3.3, 5 and 12 volt ATX outputs to screw terminals, each protected by a 1.25 amp resettable polyfuse. These four voltages cover many common electronics needs, there's even a negative voltage (-12 volts) for op amps and audio projects.

An on/off button and a control circuit are included on-board, no modifications to the ATX supply are needed.

Features

• -12, 3.3, 5, 12 volt supplies @ 1.25 amp

• 1.25 amp polyfuses with reset on each power rail

• Indicator LEDs show that each rail is working

• Power good and enabled indicator LEDs

• On-Off button and control circuit

• Optional load resistor included but NOT soldered

• Open source (CC BY-SA)

Note: A 9 Watt load resistor is included but not soldered to the board. In our experience most modern ATX supplies don't require a significant load on the 5 volt rail to start. An artificial load just wastes electricity and creates unnecessary heat. Please let us know your experience.

Some special ATX supplies provide -5volts, but the vast majority don't. We broke it out and added the fuse, but didn't populate the screw terminal.

Resources

• Documentation

• Design overview

• Discussion forum

If you encounter any problems when using this product, here is the forum from which you can get the technical support.