Parts:C1 1 10uF 16V Electrolytic Capacitor
R1, R2 2 100K 1/4 Watt Resistor
R3 1 10 Meg 1/4 Watt Resistor
U1 1 4011 CMOS NAND Gate IC
MISC 1 Board, Wire, Socket For U1
Notes:The contacts an be made with just two loops of wire close together, or two squares etched close together on a PC board.
When activated, the output of the circuit goes high for about one second. This pulse can be used to drive a relay, transistor, other logic, etc.
You can vary the length of the output pulse by using a smaller or larger capacitor for C1.