A touch switch is a switch that is turned on and off by touching a wire contact, instead of flicking a lever like a regular switch. Touch switches have no mechanical parts to wear out, so they last a lot longer than regular switches. Touch switches can be used in places where regular switches would not last, such as wet or very dusty areas.
Parts List:
C1 - 10uF 16V Electrolytic Capacitor
R1, R2 2 - 100K 1/4 Watt Resistor
R3 - 10 Meg 1/4 Watt Resistor
U1 - 4011 CMOS NAND Gate IC
MISC - Board, Wire, Socket For U1
Notes:
1. The contacts can be made with just two loops of wire close together, or two squares etched close together on a PC board.
2. 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.
3. You can vary the length of the output pulse by using a smaller or larger capacito for C1.
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