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one shot circuit

Discussion in 'Beginner Electronics' started by KK, Nov 25, 2004.

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  1. KK

    KK Guest

    Hi,
    I am trying to build a one shot circuit with NE555 timer IC, my requirement
    is when the trigger pin shorted to ground, the output should provide a short
    delay switch to logic high then back to logic low. However, according to my
    experiment, it shows that if the trigger input after shorted to ground, the
    output with keep to logic high until the input (trigger) pin disconnect for
    the ground.
    Please suggest if any NE556 connection circuit or any other simple circuit
    can fulfill my requirement.

    Regards
    Victor
     
  2. Brian

    Brian Guest

    Have the switch ac coupled to the input of the 555. Or, you could use a
    one-shot, like a 74LS123.
    Brian
     
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