The PC power supply has been a standard of the junk box ... DC at a few tens of kHz into a ferrite-cored transformer whose output is rectified to low voltage DC. The TL494 samples the output ...

For low to medium-range PC builds, I would recommend a 500W to 750W power supply. Less capable GPUs don't draw too much power ...

A benchtop power supply is a key thing to have for any aspiring electronics hacker. While you can always buy one, plenty of us have old computer ... with all outputs appropriately fused for ...