12/military clock

Discussion in 'The Projects Forum' started by krogerson2, Jan 27, 2009.

  1. krogerson2

    Thread Starter Member

    Jan 8, 2009
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    I am designing a digital clock that switches between military and 12hr time and am not sure what chip to use for the DIV 10 and DIV 6 Portions of the circuit. Also i will be using a common seconds and minutes circuit but i will need a 2 to 1 mux and am not sure what chip that would be either
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    You need to start by deciding which logic family you are going to use. Any decade counter (BCD) can divide by 10. You will need an external gate to reset a counter at a count of 6.

    Not at all sure what you mean by -
    - can you expand on that?

    Do you have any schematics you can post up?
     
  3. krogerson2

    Thread Starter Member

    Jan 8, 2009
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    well the minutes and seconds can be used by both the military portion and the 12hr portion but then it would have to go into a seperated 24 hour and 12hr for the "hours" counter then in to a 2 to 1 mux to switch between the two what would be a reccomended decade counter would a 74293 work for that?
     
  4. krogerson2

    Thread Starter Member

    Jan 8, 2009
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    wont i need a enable line on the chips in order for them to switch to the next number after the one before it cycles through its process of the EG: 0-9 on the seconds then the other seconds display will turn to 1 and so on
     
  5. Wendy

    Moderator

    Mar 24, 2008
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  6. krogerson2

    Thread Starter Member

    Jan 8, 2009
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    I have been looking at the 7490 chip to use that but i don't know how to connect the chips together because don't i need a enable line to not get the next stage to count until the first stage gets to 9 for example on the seconds
     
  7. beenthere

    Retired Moderator

    Apr 20, 2004
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    Do you have any experience working with logic, and do you have a solderless breadboard to construct circuits on?
     
  8. krogerson2

    Thread Starter Member

    Jan 8, 2009
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    unfortunatley i am drawing a blank on how that works and i do have a solderless bread board i cant remember how it knows that they are not cascaded to count to like 8 bits or is that what i want just split the display into two different parts
     
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