Jeopardy style push buttons

Thread Starter

hurtado_roberto

Joined Oct 3, 2008
1
Does anyone know how to build a circuit like the one used on the Jeopardy game show... the light of the fasted person to push the button turns on.

I designed a circuit with 3 DPDT mechanical relays, 3 push buttons, and 3 1A @ 24VAC incandescent bulbs. The schematic works but the mechanical relays are a bit slow. They're rated at 10A but the light bulbs only use about 1A. The problem right now is that if I press two button within less than 2/10ths of a second, both lights turn on.

I'm thinking of using solid state relays but I'm unable to find cheap NC relays.

Is there a solid state relay that has one NC and one NO circuit on it. It's for an old friend, a high school teacher, who wants to use it in his class.
 
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