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555 delay off circuit 90-200 sec

1/13/2013

1 Comment

 
Picture
555 off delay 90-200 sec
This is a delay off circuit based on the 555 timer. You can adjust the output time via the 10k trimmer.
When you push the button and release it timer counts backwords and keep high its output until timer go zero.

1 Comment
Daniel
2/8/2016 04:41:12 pm

RV1 isn't a 10k trimmer but a 1M one.

Also, it would have been nice to indicate how your get your timing values. I know, t=ln(3)*R1*C3 as per your schematic, but for the newbie, that would have been a nice to have, no ?

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