SMD aluminum electrolytic capacitor

Simple variable delay lighting self-extinguishing lamp circuit diagram

The step-down rectifier circuit has VDD=+9V and the power supply controller DC voltage. IC (555) and R1~R6, C1 form a power-on delay circuit, and the one-shot time depends on the position of the time switch K. The delay time td=1.1RC1. The delay time is up, the 555 is reset, the SCR is cut off, and the bulb H is self-extinguishing without electricity. The delay time can vary from 1 minute to 10 minutes depending on the time constant RC1.



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