4001 sr latch / latch problem

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  • harp
    Badcaps Veteran
    • Jun 2022
    • 609
    • Planet Earth
    #1

    4001 sr latch / latch problem

    I have simple circuit with cd4001, first is sr latch, which set is inputing from comparator, and reset is inputing from clock. Sr latch output is connected to hard latch I guess, but I do something wrong here... led 2 is flashing just as inverting clock... I want to led2 stay permanently on ance it lock signal, not to be interferencing with invalid state of sr latch. What I doing wrong?
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    • harp
      Badcaps Veteran
      • Jun 2022
      • 609
      • Planet Earth
      #2
      Ok, according to ben eater rs latch video, I think that there must be OR gate, dont know if can be used any other type of gate to work like one shoot latch? https://m.youtube.com/watch?v=KM0DdEaY5sY

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        • truclacicr
          Badcaps Veteran
          • Apr 2019
          • 327
          • australia
          #3
          If the third IC is an OR gate, then its output would be indeterminate when its external input is low. It would make some sense if it was a unity gain voltage follower op amp, but then there would be no purpose for two LEDs, as they would be displaying the same state.

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