Quiz Circuit

Discussion in 'Homework Help' started by hitonian, Dec 11, 2010.

  1. hitonian

    Thread Starter New Member

    Dec 11, 2010
    3
    0
    Hey Friend..
    I have got a problem..
    i am doing my project.. so i have to make tha Quiz Circuit which is like this
    [​IMG]
    [​IMG]

    The Desription of project is given here..
    http://www.zen22142.zen.co.uk/Circuits/Misc/quiz.htm

    When i simulated the circuit on Multisim
    The Output was not as i wanted..
    plz help mee

    Regards
    Waitng 4 reply....
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    Can you say what you need to make?
    This is not very informative.
     
  3. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    What output did you want?
     
  4. hitonian

    Thread Starter New Member

    Dec 11, 2010
    3
    0
    oOoOppSss.... i 4gOT... :S

    The OutPut i wAnt is wHeN Key A is Pressed The Corresponding Led Glows and all the other switches are at logic 0.

    then By pressing reset all come to logic 0. hope now you got the idea
     
  5. Georacer

    Moderator

    Nov 25, 2009
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    Try replacing the 1k resistances at the leds with 100Ω and tell us if there's a difference.
     
  6. hitonian

    Thread Starter New Member

    Dec 11, 2010
    3
    0
    nO eFfEct Lolx
     
  7. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    Did you tie the unused inouts of the 4082 to 0V as stated in the picture?
    Did you mount decoupling capacitors at each IC?
    See this thread for more info:
    http://forum.allaboutcircuits.com/showthread.php?t=45583

    Bertus

    PS stop playing with the caps-key, this makes the raeding more difficult.
     
  8. Georacer

    Moderator

    Nov 25, 2009
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    Typically the untied inputs shouldn't be a problem. The datasheet says the Reset and Clear are independant of the clock, but can't be too carefull.

    It might sound trivial to most of us, but did you add a digital voltage source somewhere in your workspace? Those IC's don't run on thin air...
     
  9. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    What is your Vcc?

    If your Vcc is 5V, make the resistor in series with the diodes 180 ohms.

    The circuit as drawn will simulate. If your Vcc is too low, the LEDs won't energize in the simulation.
     
  10. Georacer

    Moderator

    Nov 25, 2009
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    I arleady recommended 100Ω and the OP said it didn't help.
     
  11. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,164
    Maybe the OP can do some voltage tests and say if the Q output changes when pressing the "A" button.

    Or better yet ... do a print screen of his multisim screen so we can see how they wired it.
     
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