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.
|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|
- 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
- You can vary the length of the output pulse by using a smaller or larger capacitor for C1.