Game Show Circuit 2014-06-26

My sister and wife are in education, and the kids play a "Jeopardy" like game in the classroom. I wanted to make a circuit for them to use. After seeing several threads regarding game show circuits and attempting (unsuccessfully) to simulate many of them. I decided to attempt my own.

My circuit is for four players, and once anyone had pressed his/her button, their LED will illuminate and the circuit will lockout from any other inputs.

I used a 4013 D-type flip flop with the clock connected to...

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