long on or off delay timer

Discussion in 'The Projects Forum' started by Jurgen, Nov 8, 2010.

  1. Jurgen

    Thread Starter New Member

    Nov 8, 2010
    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