D FLIP FLOP w/reset???

Discussion in 'General Electronics Chat' started by theeld, Apr 23, 2007.

  1. theeld

    Thread Starter Member

    Oct 5, 2006
    12
    0
    Does anyone know how to make a clocked D flip flop with reset made out of only NOR gates??
     
  2. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    the answer to this is simple but first, have u attempted it urself'if so please share your progress.
     
  3. theeld

    Thread Starter Member

    Oct 5, 2006
    12
    0
    Yes I have tried it by myself..... My schematic is attached...I have a problem though, I would like to use Q' also in my logic realization, but as it is when reset is high, Q resets to 0 but Q not does not necessarily stay at 1, sometimes it toggles....hmmmm.... I think it works fine without the reset, but need a reset in my design
     
  4. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    sorry theeld,
    had some problem so cudnt get to u earlier.
    i have little experience of making ff's with gates in practice since my curriculum always kept me away from electronics :(

    are u sure the ckt works fine without a preset or clear.
    i dont see the data input to ff get inverted for the other signal.
    i have done this on paper once but dont recall it now.
    i did it with the help of kernaugh and de morgan .
    also from dia it seems that though reset (clear?) causes Q to go low,
    the o/p of the Q' is somewhat dependent on the other inputs meaning it does not necessarily go high. this is what i inferred from the dia (didnt solve it on paper)
    hope someone more experienced wud guide you.
     
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