Convert an old ATX Power Supply into a Bench Power Supply with (or without) 3D Printed Parts

You may own one or more old computer towers with an ATX power supply that just gather dust, but since the ATX connector provides +12V, -12V, 5V, 3.3V and GND signal it could be converted into an bench power supply. People have been doing this for a while, but elliotboney’s solution looks neater than most with a 3D printed part that’s attached on top of the power supply.

Once you have printed the part, which may need to be adapted to to your power supply, you just need a few banana jacks, and a power switch before connecting with the cables:

I basically kept 3 wires of each voltage, a 3 black wires for each ground. So 3 yellow for 12V, 3 Red for 5V and 3 Orange for 3V. Any extra wires I cut as close to the board as possible and put a little piece of heat shrink over the cut wires just to prevent shorts.

For the switch, you’ll use the green wire and a ground. Internally, you’ll want to connect the gray wire and an extra 5V (red) wire. This is the power_ok to let the PSU know it’s outputting the correct voltage.

That post clearly explains ATX to bench power supply conversion in details, and provides a ATX connector pinout diagram.


Once all the connections are done, the back of the 3D printed part looks like that:

Via Adafruit Blog.

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