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HOW T0 TURN AUTO TURN OFF AN EE FLASHLIGHT Answered

The FET gate gets charged and lights the LED until R2C falls below 66%

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Toga_Dan
Toga_Dan

3 years ago

Looks like a winner.

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iceng
iceng

3 years ago

The MOSFET Gate gets charged and lights the LED until R2C_seconds discharge falls below 66%...
Pick the FET that works the current needed, (2N7000 - 100ma) or (BS170 - 500ma) and adjust the R1 value appropriately.