74192 clock down counter

Discussion in 'Homework Help' started by Mark Dominic Boquio, Nov 5, 2015.

  1. Mark Dominic Boquio

    Thread Starter New Member

    Oct 21, 2015
    1
    0
    Hello Sirs! I have a project but I cannot where I did go wrong. I have to build a clock timer using 74192. MM:SS clock where it should count 59:59. But when I am setting the clock, it count until 7 and goes back to 5. And at the time 00:00 it resets which should not happened. Please help!
     
  2. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,523
    1,247
    Your video is just about useless. The image is too small and fuzzy to see any detail, including pin numbers and joined connections. Please post the schematic as a PDF or image file so it can be read.

    ak
     
  3. MrCarlos

    Active Member

    Jan 2, 2010
    400
    134
    Hello Mark Dominic Boquio

    I hope that the enclosed design serves to continue your project.

    For simplicity I omitted the 74LS47 decoder and the 7-segment displays; instead I put some Display's called HEX.

    If your counter is counting down, 59-00, you should detect when it reaches 99 and at that moment reset the counters to 59. That made the gates that look at the circuit.
     
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