24 Hour clock design

Discussion in 'The Projects Forum' started by krogerson2, Feb 17, 2009.

  1. krogerson2

    Thread Starter Member

    Jan 8, 2009
    24
    0
    I am building a clock that switches between 24hr and 12hr time i have everything built but i am having trouble making the 1's part of both hours on the 24hr and 12hr truncate at seperate numbers depending what the 10's part is doing for instance if the 12 hour clock is at 12:59 i need it to go back to 01:00 or if the 24hr clock is at 23:59 it needs to go back to 00:00 i am just not sure how to go about doing this but everything els works fine i am using 7490's for the counters and 157's to multiplex the displays

    Kevin
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
  3. krogerson2

    Thread Starter Member

    Jan 8, 2009
    24
    0
    Here is my schematic let me know if you have any ideas on what to do i am thinking OR gates to make this function
     
Loading...