Rechargeable pulse counting switch circuit based on NE555

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

Crystal oscillator 5.0*3.2mm 5032 0.67M~170M OSC can be supplied at any frequency

One-piece inductor

As shown, the count switch circuit includes a pulse controlled electronic switch and a delay circuit.
When the input has a trigger pulse, after the current limit and limiting, the TWH8778 is triggered to conduct, then C1 is charged by RP1 and R2, and each pulse is charged once. Adjust RP1 so that when the specified pulse is reached, the voltage on C1 reaches 2/3 VDD, 555 resets, K pulls in, and the controlled device turns on or off to perform counting control.
Adjust RP1 to expand the number of count pulses.