Touch Switch


Home > Circuits > Other > Touch Switch
Author Views Views Today Rank Comments
220,074 3 51
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.

Related Circuits

Air Flow Detector, Wire Loop Alarm, Simple Two Speed Contactor DC Motor Controller , 7 Segment LED Counter, Simple Lie Detector, Low Voltage Alarm, Video Stabilizer/MacroVision Removal, Pulse Width Modulation DC Motor Control, Simple Polarity Tester, Pine Racecar Victory Judge, Rain Detector, Time Delay Relay, Time Delay Relay II, Stepper Motor Controller, Touch Switch, Video Activated Relay, Digital Keypad Combination Lock, AC Motor Speed Controller, Simple Servo Controller, Water Detector With Sump/Bilge Pump Controller, Simple Touch Switch

Comments

Add A Comment

Dave
Touch Switch
Sunday, March 17, 2013 1:10:05 PM
The touch plate works great but it turn something on for as long as you hold it, so it is not a switch.
anonymous
Touch Switch
Friday, July 06, 2012 12:53:04 PM
Is there a way to make the switch work with a 40 volt power supply. I have LED's that are installed in series and they require around 40 volts.
jay
Touch Switch
Tuesday, March 09, 2010 8:00:02 AM
i need help!!!!!! how will be the out put taken and how will be the in put given their is only one out put terminal if i want connect a led how can i connect and a switch needs a input supply where should i give in put can i use ic7400 for nand gate please help me its urgent thank u
anonymous
Touch Switch
Saturday, February 06, 2010 10:28:44 PM
I need this to work with batteries... 3.7v, 6v, and 7.2v... all pushing up to 2amps. How can I configure this to work with all three situations?
Godofredo Gregorio Jr.
Touch Switch
Monday, June 15, 2009 11:27:16 PM
It's so useful. We can use it in many different way. It can be a touch switch to a 220volt lamp with a 220volt, 5amp relay connected at the output of the circiut. It's great in everyday use.... JonjonGregorio-Philippines
anonymous
Touch Switch
Monday, February 16, 2009 11:21:20 AM
what the output is going to be?? can i put an led to know if the circuit is working or not?? does the circuit working by touching wires by fingers or what?? any one knows the answers, please tell me cuz i am doing this device at the moment. thnks alot.
cuan
Touch Switch
Monday, February 16, 2009 11:08:33 AM
can i make a touch switch using two scr??? if can then how does it work. and the circuit only power by dc voltage so i have a hard time to turn off the scr.. only one touch switch is needed and the touch switch use to turn and off the bulb
anonymous
Touch Switch
Tuesday, December 23, 2008 10:02:21 AM
What am i going to do inorder to make the touch switch just like any other ordinary switches which "on" state is permanent unless it is turned off???
gardenyu
Touch Switch
Friday, November 07, 2008 5:17:59 PM
I wonder where can I buy a fairly big touch switch? ( about 1 to 2 inch diameter)?
anonymous
Touch Switch
Monday, October 27, 2008 3:59:51 AM
i was thinking about adding one of these touch switches to my shaved door handles, so all you do isun lock the car and hit the touch switch . probally mount it behind a window or where the door handle used to be.
The last 10 comments are currently shown. Show All Comments. Add A Comment

Back To Circuits Page | Mail Me | Search