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How to generate 2hours pulse with 555 timer

Discussion in 'General Electronics' started by Saeed Anwar, Jul 1, 2004.

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  1. Saeed Anwar

    Saeed Anwar Guest

    i want to drive a 5V relay such that it is on for 2 hours and off for 10 seconds
    again on for 2 hours and off for 10 seconds and this process continue. how this
    can be implemented with 555 timer.
  2. Robert Baer

    Robert Baer Guest

    Use multiple timers; one to do seconds as the timebase, which triggers
    a 10 second timer (giving the 10 second timer better stability and
    accuracy), and also triggers a 30 second timer (same reasons).
    Then have the 30 second timer trigger a 15 minute timer (same
    reasons), and that one trigger the 2 hour timer (same reasons).
    This does help, but for a decent 2 hour time delay, the better way to
    go is to clock a binary divider.
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