TOUCH SWITCH and TOUCH ON-OFF

Published:2013/8/1 22:25:00 Author:lynne | Keyword: TOUCH SWITCH and TOUCH ON-OFF | From:SeekIC

The Touch Switch circuit will detect stray voltages produced by mains voltages and electrostatic build-up in a room. In the first circuit, pin 2 must see a LOW for the circuit to activate. If sufficient static voltage is detected by the plate, the chip will change state. If not, you will need to touch the plate and the 0v rail. In the second circuit, two touch plates are provided and the resistance of your finger changes the voltage on pin 2 or 6 to toggle the 555. The circuit can be made 100 times more sensitive by adding a transistor to the front-end as shown in the diagram below:



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