Tact switch circuit composed of 555

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

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

One-piece inductor

As shown in the figure, the position and reset characteristics of the trigger terminal 2 and the threshold control terminal of the 555 time base circuit are obtained. Press switch AN2 to make 5553 pin low level, relay J pulls in, closes its normally open electric shock, and the circuit power is turned on; press AN1, 6 pin potential is higher than its threshold level, 555 flips, 3 feet Low level, J release, circuit power off.