Touch Switch


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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.

Schematic

Schematic for Touch Switch

Parts

Part
Total Qty.
Description
Substitutions
C1110uF 16V Electrolytic Capacitor
R1, R22100K 1/4 Watt Resistor
R3110 Meg 1/4 Watt Resistor
U114011 CMOS NAND Gate IC
MISC1Board, 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.

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Comments

anonymous
Touch Switch
Tuesday, May 06, 2008 11:20:58 AM
great job.....can i put a led in the output so that the led turns on when i touch the circuit???? thankss
istiak
Pin configuration of NAND gate
Tuesday, April 01, 2008 2:41:23 PM
Very nice design. But i need to know the pin-configuration of NAND gate IC. Help me please...
kartik
Touch Switch
Tuesday, March 18, 2008 10:35:29 AM
very usefull
anonymous
Touch Switch
Friday, March 07, 2008 4:10:39 AM
nice work!!! well i'm trying to make a touch alarm using 16f84,, but i got confused on its code... could anyone show me where to find such codes for my pic.... the output is only a siren and 1ed,,,thanks....!
Alan
Touch Switch to earth !!!!!
Monday, February 25, 2008 4:30:15 AM
Hi does anyone out there know how to make the output of this device switch to ground instead of a voltage out ?? I just need a circuit that is momentary switched to earth while touched by a finger. a touch momentary close and reset. I just cant find a simple circuit to do this one and its driving me nuts. Thanks Alan
Nate Bailey
Touch Switch
Monday, February 11, 2008 9:57:43 PM
i have a model L-500A touch lamp control and i clearly have a resistor that has had the smoke let out of it, i need one that has the smoke in it. the problem is, is that its burnt and i cant make out the color markings on the resistor. i know its R4 but thats it. everything else cheked out ok.
eric
Touch Switch
Friday, January 04, 2008 8:34:42 PM
great job!!!im looking for touch switch conect to relay that trigger on/off. regards, eric
Alex
Touch Switch
Monday, December 31, 2007 7:37:31 AM
I am not familiar with 4011 CMOS NAND Gate IC, could you make the actual drawing of this IC showing all the pins in your diagram.
Lee lor
electronic circuits
Tuesday, December 18, 2007 4:32:02 PM
Hi, do you have all of these parts for the Touch Switch circuits, and if you do, how would I order it from you or where can I get these parts.
Fery
all project
Sunday, December 16, 2007 7:55:03 AM
Let me introduce my self, my name is fery Irawan, i'm from indonesian great job man!!!very cool, keep your project move to the next way. thank's for the schematic man,it's very simple but usefull&powerfull than other complex schematic.it's very intrested.
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