Presettable CD4510 BCD up/down counter

Discussion in 'Electronic Basics' started by gentech.st@gmail.com, Oct 19, 2006.

  1. Guest

    Help needed on how to preset the CD4510 BCD up/down counter to any
    digits. I am looking
    for a 2 digits 7 segment count down timer circuit. Please help.
     
    , Oct 19, 2006
    #1
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  2. Fred Bloggs Guest

    wrote:
    > Help needed on how to preset the CD4510 BCD up/down counter to any
    > digits. I am looking
    > for a 2 digits 7 segment count down timer circuit. Please help.
    >


    Pulse pin 1 high????
     
    Fred Bloggs, Oct 19, 2006
    #2
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  3. default Guest

    On 18 Oct 2006 22:02:47 -0700, ""
    <> wrote:

    >Help needed on how to preset the CD4510 BCD up/down counter to any
    >digits. I am looking
    >for a 2 digits 7 segment count down timer circuit. Please help.


    You would need two of them, and some dip switches or hardwired preset
    inputs to set the "count from" digit. Or if you want to get fancy -
    there are decimal thumb wheel switches that read the digit 0-9 and
    output the BCD code - or you can just get a ten position rotary switch
    and do it yourself with steering diodes.

    The outputs have to be sent to a decoder, driver (can be in a single
    package usually including a "latch" to hold the count input
    temporarily)

    http://www.play-hookey.com/digital/experiments/counter_display.html

    Gives the basics

    Your display driver would depend on whether you want Common Cathode or
    CA display LEDs or an LCD display.

    This stuff is really easy to do - just a few data sheets and some
    think time - and it has been presented in thousands of hobby articles.
    Search.

     
    default, Oct 19, 2006
    #3
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