Touch relay switch circuit diagram

Published:2011/8/4 21:11:00 Author:Sophia | Keyword: Touch relay switch | From:SeekIC

Touch delay switch circuit formed by the time base NE555 chip. IC1 is a 555 timer circuit, which also becomes monostablecircuit. Usually because P-side of touching film doesn't have induced voltage, which make capacitor C1 discharge through the 7th foot of 555 , 3-pin output is low level. The relay KS is released, and light does not shine. When you need to turn on the lights, we just touch the metal P with the hands. The noise signal voltage of the human sense is added from C2 to the trigger terminal of 555, which makes the output of 555 become high from low output, relay KS pull and light lightened. Meanwhile, the first 7 pin interior of 555 within is stoped, then the power charge to C1 through R1, and this is the beginning of time.



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