555 monostable multi vabrator

Discussion in 'The Projects Forum' started by mbasile35, Jan 21, 2013.

  1. mbasile35

    Thread Starter New Member

    Nov 2, 2011
    23
    0
    Hey everyone

    Im desinging a ciruit that will control twp relays when power is applied to the circuit. I've done a little research and I think a monostable multivibrator circuit should work for me. If I understand corretly as soon as the circuit sees an input voltage, the 555 can turn on a relay that would hold for a certain amount of time? Even if my input stays contantly on?


    Thanks
    Mike
     
    Last edited: Jan 21, 2013
  2. wayneh

    Expert

    Sep 9, 2010
    12,103
    3,038
    Yes, that's true. But I recommend sketching out your idea into a schematic for review. Worth a thousand words.
     
  3. mbasile35

    Thread Starter New Member

    Nov 2, 2011
    23
    0
    Ok here's the schematic. I through it together pretty quick but here it goes. The input is tied directly to ground because i want the trigger to be the board actually getting power.

    [​IMG]

    I based the circuit on this page I selected the values of C4 and R1 based on the equation on that site so get a 1 second timing period.

    Does this seem like its going to work?

    Thanks again
    Mike
     
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