Building a 60 Second Stop Watch

Discussion in 'Homework Help' started by Beckinsale, Jan 2, 2012.

  1. Beckinsale

    Thread Starter New Member

    Jan 2, 2012
    I have a assignment which i need to design a 60 seconds stop watch with start/stop and reset functions.

    ICs required : 74LS93,74LS00,74LS32
    And any other standard logic gates or flipflops.

    i have successfully design a MOD60 counter by using a MOD10 and a MOD6. it does count from 00-59 and go back to 00 again.

    my next step is to include the start/stop and reset function which i have no idea what to do. My objective is to use 2 pulse switch for the start/stop and reset buttons and to use a preset clear J-K flipflop in my circuit.

    -----> <----- for my multisim file

    PS: i know this assignment have been posted many times but i still do not have an idea on what to do with my circuit. therefore i hope anyone of you can give me some suggestion or hints on what to do.
    Last edited: Jan 2, 2012
  2. thatoneguy


    Feb 19, 2009
    A simple way would be to use one button that toggles a flip flop to start/stop the counting.

    Use a Buffer with Enable to block or allow the clock to be passed to your counter section via the flip flop output controlling the enable line.