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Electric scheme for quiz

Discussion in 'Electrical Engineering' started by Giovanni Noppe, Nov 26, 2004.

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  1. Hello,

    I 'm looking for an electric scheme on how I can make a kind of a 'quiz
    Every man (say 4 men) have a switch or a button and a lamp. The quizmaster
    also have a switch or a button. The quizmaster asks his question and then
    the first one who presses his button, his lamp lightens up. If someone else
    now presses his button, then the lamp doesn't lighten up. When the
    quizmaster presses his button, then the 'quiz board' is resetted.
    I hope I get some solutions, not electronical but electrical, in such a
    cheap way possible.

    Thanks in advance,

  2. A tiny bit of "electronical" can make this very simple and
    very cheap- just by using a thyristor and a few simple
    components for each contestant. Very fast too and able to
    resolve the teeniest time difference between players. With a
    DC supply, the thyristor automatically acts as a memory -
    remembering that it was activated even though the button has
    been pressed only momentarily. The circuit is trivial and
    needs no setting up - it just works.

    You can do the same thing if you have latching buttons and
    say use neon lamps. The battery operated push-lamps, used in
    cupboards and under stairs can give you a good start as the
    switches - as they latch and are big and round and cheap and
    llok the part. Basically, you replace the low voltage lamps
    in the units with neon lamps. Then you arrange things with
    the neons fed from a common supply via a common resistor -
    when one neon fires and lights, it drops the voltage across
    the others to too low a voltage to allow them to fire. As
    this is a high voltage solution, you need to know what you
    are doing - so please don't try to make this up unless you
    do. I just mention it because it is cheap and isn't
    "electronical" in that it doesn't use semiconductors - and
    it does work. No reset button is needed - the switch just
    needs to be operated again to reset it.

    You can do the same thing with relays - especially latching
    relays. Again, you use the first relay to activate to remove
    power from the circuits of the others - so they can't
    operate. This can be more difficult than it sounds and high
    speed latching relays (often reed-relay based) cost far more
    than the cheap thyristors needed with the first solution. I
    wouldn't recommend this approach as it can give very
    unsatisfactory results.

    So, quite honestly, in spite of your reservations about
    electronics - I would suggest going for the thyristor
    solution. They are often/ mostly used by electrical
    engineers and not "electronicals", after all. Any thyristor
    cookbook will have the circuit you need but, otherwise,
    email me (without the invalid bit) and I will send you one.
  3. tbone

    tbone Guest

    wow, thryristor cook book?

    what other neat uses does it have?
  4. Get the recipe wrong and it also does nicely as a local
    entertainment guide - fire engines and ambulances normally
    attract a crowd. Unlike CMOS cookbooks, which are better for
    those with more conservative tastes.

    Of course, those experienced with the ingredients don't need
    cookbooks, they can invent their own recipies - but no
    practical cook can get far without a breadboard.

    Who says electronics engineers need to get a life? All the
    ones I know are keen on athletics, such as endless practice
    with hops, steps and jumps. However, after the hops
    practice, the steps and the jumps are mostly ICE*.
  5. tbone

    tbone Guest

    um, what?

    i was just looking for some interesting circuits to build, possibly with
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