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7400 competition entry: Quiz Show Buzzer

Posted on Friday, November 2nd, 2012 in 7400 contest, contest by DP

Need a quiz show buzzer system? Check this out!

A Quiz Show Buzzer was just built only with 74XX series device. A single 74LS373 Octal D-Type Flip Flop was used instead of several AND gates. Eight DATA INPUTs serve as quizzer’s user interface and the eight DATA OUTPUTs were connected to 8-input AND gate which provide the logic HIGH or LOW to GATE INPUT of 74LS373, the purpose of this is to disable all inputs after the first output became logic HIGH. The logic signal from DATA OUTPUTs can be use to drive a 7-segment display (for displaying quizzer’s number) and SSR (for indicator).

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

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This entry was posted on Friday, November 2nd, 2012 at 1:00 am and is filed under 7400 contest, contest. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

6 Responses to “7400 competition entry: Quiz Show Buzzer”

  1. Alex says:

    I see he runs his logic at a nice standard 7.6 volts.

  2. Kiko says:

    7.6 V DC is within the minimum Vin Voltage Input for 7805 IC Volatge Regulator.

  3. Kiko says:

    Video Clips:

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