I'm trying to design a circuit that automatically switches power to battery when mains supply (wall wart) is cut. I'd rather not use relays. I have in my head an idea of using a npn controlling a pnp but I can't make it work in practice. Someone must have done this before?

Circuit to swap to battery power

system January 21, 2010, 1:45pm 9

Sorry to disturb your conversation

ROFL

edit:

Didn't want to be rude in any way.

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