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Cole Hersee Company's FlexMod 48636 Electronic Timer for interior vehicle lighting was designed for use on any vehicle containing a cargo compartment. The FlexMod 48636 Electronic Timer unit ...

When you first clamp your hands, mic detects the sound and triggers the 555 timer via the operational amplifier. The timer stretches the signal and applies it to the clock input of the flip-flop.

(1.1*55*1000*1000)/1000000 = 60.5 ~ 60 seconds. A variable resistor of 1M is used here and set on 55k ohm (measured by multimeter). We can easily calculate the resistor value for 5 minute, 10 minute ...