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long on or off delay timer

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Jurgen

Joined Nov 8, 2010
1
I need to build a long delay timer from power on preferably using a 555. I need a timer that will activate a 12VDC (low power) relay up to 30 minutes after power-on. Accuracy can be low (+/- 5 min.) It will be used to time fuel useage from various fuel tanks. The timer should trigger automatically with power-on. Vcc will be 12VDC.

Thanks, Jurgen Amtmann
 
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