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Continuous Logic Conversion

Discussion in 'Electronic Basics' started by Daragoth, Dec 13, 2003.

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  1. Daragoth

    Daragoth Guest

    Hi, I'm somewhat of a beginner to circuit design and have a question.
    I have a digital device that generates a logic '1' signal when a
    switch is flipped on and goes back to '0' when flipped off. I'm
    trying to figure out how to alter the circuit so that when the switch
    is flipped on for longer than 2/60th to 3/60th of a second it changes
    back to logic '0' regardless of the position of the switch. What
    would be necessary to accomplish this? I was thinking perhaps a
    counter and a clock, but I'm not too sure. I appreciate any help in
    the matter, thanks.
     
  2. Ian Stirling

    Ian Stirling Guest

    Nonretriggerable monostable.
    Search TIs website for TTL chips, and you'll find the appropriate part.
     
  3. John Fields

    John Fields Guest

    ---
    Sounds like all you need is a one-shot with a period of 50ms which is
    started when the switch goes ON. If you need to be able to have the
    output go OFF if the switch is turned OFF before the one-shot times out,
    then connect the output of the switch and the output from the oneshot to
    the inputs of a 2-input AND and take your output from the output of the
    AND.
     
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