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Placed side by side, two touch pads form an "on" and an "off" pad.Īir 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 So a 2nd circuit with a normal relay can be used to cut power (use the NC contacts on the 2nd circuit). To turn off a latching relay, power must be interrupted. As mentioned, a latching relay can be used so that a momentary touch activates the relay and it remains active.

Alternatively, something like a penny glued to a plastic backing will do the job.

The touch pad can be most easily made by cutting a small square of PCB material and then soldering on a single wire.

Relay w/12V Coil, Contacts To Suit Applicationīoard, Wire, Small Metal Pad For Touch Pad Using a latching relay and two of these circuits, a simple two pad "touch on/touch off" arrangement can be made. As it uses only a few commonly available transistors and a 12V supply, it is ideal for hostile environments where mechanical switches would be damaged. It is designed to directly switch a relay to allow it to be used with large loads. Similar to the CMOS based Touch Switch also on this site, this transistor based touch switch can activate a load simply by the user touching a metal plate.