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Divide by two counter

Discussion in 'Electronic Design' started by Tanty, Feb 24, 2004.

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  1. Tanty

    Tanty Guest

    Iv'e heard you can build a divide by two counter using a 555 timer (for
    toggling the state of a relay with a push button) . I build one using a dual
    j-k flip flop but the debouncing gets messy. If such a circuit exists does
    it include debouncing or would I need to use a shcmidtt trigger?
    Any ideas?
    thanx
    Tanty
     
  2. CFoley1064

    CFoley1064 Guest

    Subject: Divide by two counter
    You might want to try something like this -- it will give you what you want
    with just two inverter gates, two resistors and a cap (view in fixed font or M$
    Notepad):

    Debounced Alternate Action Pushbutton
    ___
    .-------------|___|--------------.
    | |
    | 10K |
    | |
    | | Output to Relay
    | |\ |\ |
    o-----| >O------o--------| >O----o------------o
    | |/ | |/
    | .-.
    | | |100K
    | | |
    | T '-' 0.1uF
    | --- | ||
    '-----o o-------o------||------.
    || |
    |
    ===
    GND

    This will work "as-is" with any standard CMOS output inverter gate at any
    voltage. I believe there's something like this in Don Lancaster's CMOS
    Cookbook. It's available through bookstores or at his website:

    http://www.tinaja.com/

    It's a good intro to using logic gates to get where you want to go.

    Good luck
    Chris
     
  3. Bill Bowden

    Bill Bowden Guest

    If you use a double pole relay, you can toggle it with a
    push button using one transistor, one cap, and 4 resistors.
    No debouncing necessary, and it always powers up with the
    relay de-energized. Example is here:

    http://ourworld.compuserve.com/homepages/bill_bowden/page9.htm#toggle3.gif

    -Bill
     
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