9-0 Counter using J-K Flip Flop

Discussion in 'The Projects Forum' started by batoinkx, Oct 15, 2014.

  1. batoinkx

    Thread Starter New Member

    Nov 13, 2012
    6
    0
    I'm currently designing my 9-0 counter for my project.
    I simulated my design and the output is just 9,8,5,4,1,0 i think my j2 and k2 has a problem.
    Kindly check my work sir. :)
    1.jpg 2.jpg 3.jpg 4.jpg 5.jpg 6.jpg 7.jpg 8.jpg 9.jpg 10.jpg
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    Your circuit worked when I simulated it.

    Check/post your simulation.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,364
    You have J1 = Q1'. Q0' . (Q2 + Q3)

    Since this is the Q1 J-K flip-flop this becomes

    J1 = Q0'.(Q2 + Q3)
     
  4. batoinkx

    Thread Starter New Member

    Nov 13, 2012
    6
    0
    Here's my simulation sir, it didnt worked. :( 9,8,5,4,1,0 09.jpg
     
  5. batoinkx

    Thread Starter New Member

    Nov 13, 2012
    6
    0
    sir what rule did you used to simplify j1? :)
     
  6. batoinkx

    Thread Starter New Member

    Nov 13, 2012
    6
    0
    BTW this is a 9-0 counter, my thread subject is wrong my bad sir. :D

    Edit: Title corrected to show 9-0 Counter using J-K flip-flop.
     
    Last edited by a moderator: Oct 15, 2014
  7. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,364
  8. batoinkx

    Thread Starter New Member

    Nov 13, 2012
    6
    0
    oh tnx a lot sir, how about my circuit or k mapping? I simulated it using Logism, its not working. It keeps on skipping 7,6,3,2 those state has a high Q2 output.
     
  9. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,364
    Then obviously, check your J and K inputs to Q1.

    You forgot to connect Q0' to K1
     
  10. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    Yup, you missed the \overline Q_{0} to K_{1} connection...

    mod10downcoutner.png
     
  11. batoinkx

    Thread Starter New Member

    Nov 13, 2012
    6
    0
    Yay. Thank you so much sir. More I2R to this site. :)
     
  12. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,364
    Now try removing Q1' from the J1 expression.
     
Loading...