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bell/buzzer board

Discussion in 'Electronic Basics' started by Firefighterwatts, Nov 29, 2004.

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  1. hi i need help in making a bell /buuzzer board, the kind of thing that is used
    on t.v panel games where the quickest on the bell/buzzer lights their light and
    gets to answer the question. i hope someone out there can help
  2. CFoley1064

    CFoley1064 Guest

    Subject: bell/buzzer board
    Try this:

    I like the first circuit, with the 12VDC power supply (2 6V lantern batteries
    in series is OK for school stuff, where you can't plug anything in) and the 6V
    lantern bulbs. It's just about the stone simplest type of indicator circuit
    for this stuff (and the parts have Digi-Key part numbers). The only addition I
    would make is to put 470 ohm 1/4 watt resistors between the gate and the
    cathode of the SCRs to help prevent false triggering.

    The addition below the first circuit is good if you want to add a buzzer. Be
    sure to use a separate 9V battery for the buzzer like it says, as it might
    trigger the SCRs.

    Good luck
  3. Bill Bowden

    Bill Bowden Guest

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