Sunday 23 April 2017

timer - Need single-shot 1 minute delay-off LED circuit


What I would like to do is have an LED turn off 1 minute after the power is turned off. The LED would be on all the time when power is on. Thus:


Turn power on: LED comes on immediately. Turn power off: LED stays on for 1 minute and then turns off.


This is to signal when someones eyes have adequately adjusted to the dark in a darkroom.


Thanks in advance.




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