Old ATX computer power supplies are cheap-to-free, and make great lab supplies if you’re willing to add a resistor and short a few wires. Sjaak whipped up an ATX breakout board as an easier way tap and control an ATX supply without any messy hacks.
3.3, 5, 12, and -12 volts are routed from the ATX connector to screw terminals on the breakout board. Each rail has a 1.25 amp resettable polyfuse to protect projects from the full 30amps+ some power supplies output. This workshop video is about the breakout design and 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)
Available for $13.80 at Seeed Studio.