Touch triggered bistable

Posted on Sep 28, 2012    8325

This circuit uses a 555 timer in the bistable mode. Touching T2 causes the output to go high; D2 conducts and D1 extinguishes. Touching T1 causes the output to go low; D1 conducts and D2 is cut off. The output from pin 3 can also be used to operate other circuits ( a triac controlled lamp). In this case, the LEDs are useful for finding the touch terminals in the dark

Touch triggered bistable
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Cl is not absolutely necessary but helps to prevent triggering from spurious pulses.

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