Touch trigger bistable circuit schematic

Touch trigger bistable circuit schematic

This circuit is a 555 timer that operates in bistable mode. Touch T2 to make the output go high; D2 turns on and D1 goes out. Touch T1 to make the output low; D1 is on and D2 is off. The output of pin 3 can also be used to drive other circuits. In this case, it is useful to use these LEDs to find these touch terminals in the dark. C1 is not absolutely necessary, but it helps prevent the triggering of parasitic pulses.



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