IC carryout

Discussion in 'The Projects Forum' started by afree1, May 29, 2008.

  1. afree1

    Thread Starter New Member

    May 29, 2008
    Hi im building a counter using a cmos 4026 and a monostable 555 timer to debounce the switch. The counter will be used for a scoreboard and I dont want to pay for a large 7seg led....so i built one with spare led's I have. My question is this.

    I want to use the carry out pin on the 4026 to drive a string of leds in parallel (through a transistor of course) to create a 10's digit, but the carry out is high from counts 0-4 and low from counts 5-9. How do i go about creating a sort of trigger to light these up after the 4026 goes from 9-0.


    ps. i know i could just use another 4026 but id like to avoid that...im thinking somewhere along the lines of logic gates, or maybe a flip flop.
  2. SgtWookie


    Jul 17, 2007
    I'm wondering why you'd want to add several more gates and flip-flops which would be in more than one IC, rather than simply adding a single 4026 IC that's the perfect solution for the problem?