Schematics > Security and other sensors and detectors > Touch Switch II
Touch Switch IIA 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.
Schematic
Parts
| Part |
Total Qty. |
Description |
Substitutions |
| 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:
1. The contacts an 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
capacitor for C1.
Title: Touch Switch II
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 516
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