clock problem

Discussion in 'The Projects Forum' started by yasir_66, Jun 25, 2009.

  1. yasir_66

    Thread Starter Active Member

    Jun 25, 2009
    71
    1
    Sir i am making a BCD counter.I used HEF4543 for driving 7-segment & MC14553 decade counter.when i give pulse to pin#12 of MC14553 the display shows counting unstable or once pulse gives counting of more than 1.
    How can i do this that one pulse give only one count?
    can i use 555 for this purpose?
    also i want to use an optocoupler so that the interruption in optocoupler will give one count.
    Please help me.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,650
    2,348
    Hello,

    You will need a debouncing circuit.
    This can be done by a NE555 as a monoflop.

    Greetings,
    Bertus
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    How are you giving the pulse?

    If it is a switch or relay you need debounce.

    555 Monostable

    [​IMG]
     
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