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Counter circuit

Discussion in 'General Electronics Discussion' started by atollp, May 25, 2012.

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  1. atollp

    atollp

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    Feb 11, 2012
    Hi forum,

    I'm having an issue with a counter circuit I'm attempting to build. I have followed the attached schematic in an attempt to build a 0-59 counter with NOT and AND gates.

    I have constructed the schematic as shown however when I power on the circuit, the units will count up correctly, but when I try to get it to count down, the units will count down from 9 until 7, and at 7 the tens will count down one digit, and the units will continue to count down until it gets back to 7, at which point the tens will decrease again.

    I would like, if possible, to have it count down until the units reaches 0, and then the tens will decrease a number. Is this possible?

    What have I missed? Thanks for the help.

    (to get to schematic scroll all the way to bottom of page and then scroll up until you get to the first two schematics, that is what I'm trying to build) http://www.doctronics.co.uk/4510.htm
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,191
    2,558
    Nov 17, 2011
  3. atollp

    atollp

    33
    0
    Feb 11, 2012
    Thanks Harald, I figured it out using a simple AND gate, but this website is really helpful
     
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