The PC power supply has been a standard of the ... the show whose data sheets will often give you an entire ATX power supply schematic, but since their circuitries will often be very similar ...

While you can always buy one, plenty of us have old computer PSUs lying around ... a load resistor on the 5V circuit makes the power supply think it’s hooked up to a motherboard.

A computer power supply converts AC into multiple DC voltages ... Their name is derived from the type of circuit used to change the voltage. For more details, see transformer.