I have a circuit that operates at 3 VDC and less than 10 mA. I need to control power to the circuit in reverse. That is, the circuit is powered up when a switch opens and powered down when the switch closes. To conserve battery life the power control circuit must draw 1 uA or less when power to my circuit is shut off. Can anyone show me a way, perhaps using MOSFET switches, to do this?