Adjustable intermittent switch circuit schematic

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

Adjustable capacitor Murata genuine original

TZC3Z030A110R00 MURATA Murata adjustable capacitor original spot

The switch circuit is used for motor speed control, and the intermittent cycle and the intermittent time can be independently adjusted without affecting each other, and can also be used as other controller oscillation signal generators.
As shown in the figure, the set period is 1.5~3s, and the duty cycle of relay J is 0.2~0.333 continuously adjustable. 555 constitutes a multivibrator. W1 adjusts the output pulse duty cycle, R1 constitutes the feedback circuit of the 5th pin of the control terminal, and W2 can adjust the oscillation period without affecting the duty cycle.