Now you can’t just hook up the 22 ohm resistor to a 5V power supply for the sake ... [Paul] suspects the switching power supply inside battery pack probably draws more than that!

The plan was to use the always-on 5V standby rail to drive a pair of relays. One relay senses the computer’s on/off switch and triggers the ATX power supply to turn on. The problem is the ...

A computer power supply converts AC ... while 3.3v and 5v are used by the chips and other motherboard components. Power supplies known as "switching" power supplies are commonly used.

DER-1045Q – 16W four-output power supply – one 14V EPS output and three gate-drive outputs with split with +18V/-5V rails.