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[HELP] Timing circuit advise

Discussion in 'General Electronics Discussion' started by eight08, Mar 4, 2012.

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  1. eight08

    eight08

    14
    0
    Apr 16, 2010
    I'm trying to build a circuit that would trigger at a certain amount of time, and then repeat.

    What is the best design plan? :D:D:D
     
  2. siggy

    siggy

    36
    3
    Mar 3, 2012
    555 astable with a duty cycle less than 50%

    R1 >= R2 iirc
     
  3. siggy

    siggy

    36
    3
    Mar 3, 2012
    Duty cycle is time on

    1% to 49% is short on longer off
    50% on off equal
    51% to 100% is longer on short off
     
  4. jackorocko

    jackorocko

    1,284
    1
    Apr 4, 2010

    What is the time period length you are interested in, mark space ratio? How accurate does the timer need to be? Have you read the sticky about timers?
     
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