Most of these power supplies use a transformer to step down the voltage to a more usable level and also to provide some galvanic isolation to the low voltage circuit. But for circuits where weight ...

A computer power supply converts AC into multiple DC voltages ... For more details, see transformer. See power adapter. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires ...

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