7 segment & 4-bit counter

Discussion in 'Homework Help' started by starskyinn, Apr 26, 2007.

  1. starskyinn

    Thread Starter New Member

    Apr 26, 2007
    I need to help about this.it should counts 1,3,5,7,9,1,3,5,.... like this.How can make this circuit? (with JK Flip Flop)

    sorry for my terrible english:(

  2. recca02

    Senior Member

    Apr 2, 2007
    its obvious u'll need 4 - J K ff.
    now the connections will be little bit similar like normal counter.
    what u'll have to do here is make the truth table for each j k ff
    which takes into account the previous and next state of
    the flip flops depending on which u'll get 4 k map to solve.
    thus u'll get the required inputs for the j k inputs of each ff.

    one more thing for j k ff and s r ff as well as t and d ff
    there is a truth table that tells abt the input needed for a certain change of o/p frm previous state to next state.
    your problem needs this information,it can be found in any good book i believe.

    i can only help u this much because my knowledge of electronics is rusty
    also a good book on k map will have a similar problem solved in it,
    try referring to it.

    if u read my other posts u'll see similar answers :)
    which only implies that k map and Quinn McCluskey methods shud be learned by everyone
    who pursues electronics it makes life lot easier.
  3. zongo

    New Member

    Mar 17, 2009
    hi.can i get functions for seven segment display from which i can draw circuits,please...
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    Take the output from the flip flops as the BCD input to a 7 segment driver. Look up a 7447 or a 4511 for examples.