MOD-60 start/stop and reset! Need help please:(

Discussion in 'Homework Help' started by HelloCircuits, Nov 11, 2010.

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  1. HelloCircuits

    Thread Starter New Member

    Nov 11, 2010
    I am given an assignment by my lecture. We are using two 74LS93N(4 bit binary counter) ICs to build a 60 seconds stopwatch. I have no problem building MOD-60 counter from 00 - 59 and it will reset to 00 when it hits 60. I have connect the these two 74LS93N to two 7 segment LED common Anode. I use MOD-6 and MOD-10 to come up with the MOD-60 counter.

    However, I do not know how to add in stop/start and reset buttons. The reset button switch will clear or reset the mod-60 counter to 00 when activated. ie, 00 until it is started again through the use of the start/stop switch.

    If the mod-60 value is running , activating the start/stop switch will stop the counter at its current count value, ie, 40, which indicates a time lapse of 40 seconds from the start. Reactivating this same switch will cause the mod-60 counter to resume from this previously stopped value.

    We are given one 74LS00 and one 74LS32 as well.

    If possible please upload a picture of it thanks! :D
  2. bertus


    Apr 5, 2008

    As this is an assignment, I moved it to the homework help section.
    Can you show us what you have upto now?
    (post your schematic)

  3. beenthere

    Retired Moderator

    Apr 20, 2004
    This also is in addition to the post you made as a hijack in another thread.
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