Using a timer chip to form a touch-sensitive switch circuit

As shown, the circuit consists of a buck rectifier circuit and a 555 flip-flop. When the hand touches the metal piece A, the sensing signal causes the comparator inside 555 to be turned over, K is pulled in, and the contact K1-1 is closed; if A is triggered again, K is released and K1-1 is turned off.

Finger touch sensing switch circuit



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