When the momentary push-button (PB) switch is closed, 12V from C3 is applied at A, causing T2 to turn on. This state grounds the Reset bus, turns on PFET T4 by putting V gs (on) on its gate through ...

The RadioShack guys, of course, didn't know.<P>As I understand it, the ATX switch is a "momentary" push button, that works like a DOORBELL switch -- i.e. push it in for a momentary connection, and ...