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A 3 digit Counter

Discussion in 'General Electronics' started by marwiz, Mar 3, 2005.

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  1. marwiz

    marwiz Guest

    Hey guys
    i want to make a counter that counts down from 470 to 0 whenever the
    switch is activated

    where do i start????
    i'm clueless??

    email me
  2. Lou

    Lou Guest


    You could use 3 presettable U/D counters in the down mode. You preset
    them at 470 or whatever value and you clock them at the rate you want
    as soon as the preset enable input is released. If you need to display
    the counting, you have to add decoders and a display.
    Example ICs:
    Counters: CD4510
    Decoder driver: CD4511
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