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ATX is the standard for PC power supplies. It has +3.3 V, +5 V, and +12 V. They share a common ground. It has a PS_ON# signal which needs to be grounded to turn it on. Don't open power supplies that run on line voltage (AC). They have dangerous voltages and currents inside
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Converting ATX PSU to bench power supply
And I just came across a video, a guy converting ATX PSU into bench power supply. And I found that all those converting PSU into bench supply are connecting a power resistor across 5V rail. …