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Quiz Buzzer

Discussion in 'Electronic Basics' started by senapathy, Jan 5, 2006.

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  1. senapathy

    senapathy Guest

    Hi all,

    I would like to know a simple circuit for QUIZ PROGRAM.

    Thanks in advance.
  2. JeffM

    JeffM Guest

  3. Gerhard

    Gerhard Guest

    One of the best (simple) designs I came across was published in
    the Design Ideas section of EDN Magazine June 27, 2002, by
    Vasiliy Borodai, titled 'Circuit improves further on first-event detector'.

    The circuit requires only two wires per button (three if the LEDs are
    placed at the buttons). The signal at the junction of the LED and the
    first and second gates could be buffered to drive additional indicator
    LEDs, or high power lights for an audience.

    Disconnecting one of the inputs of the second gates and wiring them all
    together in a common line to an 1M Ohm pull down (fig a) or pull up (fig b)
    resistor and a 'Reset' switch to pull this line up or down. This 'Reset'
    switch can then be used to 'clear' or 're-arm' the circuit quickly if one of
    the players 'jumped the gun'.

    If the capacitors are replaced with wire links, only the 'Reset' button will
    able to 'clear' or 're-arm' the circuit. I do however find the 'auto
    arming' of
    the circuit (after +-15 secs) to be one of its best features.

    Circuit (b) could possibly be implemented using 74HCT00 or 74HCT132 gates
    running of 5 to 6volts. The 2k5 resistor will probably have to be reduced to
    1K or even 680 ohm, to allow enough current through the LEDs.
    Red LEDs (with their low forward voltage) will be preferred.

    Gerhard van den Berg
  4. Rich Grise

    Rich Grise Guest

    What's supposed to happen if a player jumps the gun is to lock that player
    out for the round. In Jeopardy tryouts, they say, "On the last syllable of
    the last word" of the clue. If you push your clicker while Alex is giving
    the clue, you don't get to play that one.

    Plus, the ones in the article are monostables. How hard would it be to
    make them bistable, with a moderator reset button?

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