I will also add to this. Depending upon the ATX power supply itself as well, some of them actually need a load (I use a 10w 10ohm resistor) on the 5v and 12v circuits. That is, so the power supply see's a load, and retains "latch".
Originally Posted by WB2WIK
On SOME of the power supplies, they may even need one on each "rail". As some power supplies actually have 2 12v circuits. Even more power supplies have 2 5v circuits now, and some are 2+ 12v circuits. This drasticly complicates repurposing the power supply for other then "PC" use.
The good news is, most 400w power supplies can output 10+ amps @ 12v, and maintain excellent voltage regulation.
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