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When you say game buzzer, do you want a circuit that once button A has been pushed, and the corresponding light or buzzer sounds, pushing button B has no effect, unless the circuit has been reset.
#1. The nor gates used have too many inputs. You can do the same circuit with a 3-input NOR gate.
#2. Since there is only one buzzer, this circuit is almost unnecessary. All you need to do is put any number of keys together (depending on # of players) in parallel. Connect it to +ve and the SET pin on the 4013 chip.
Connect the SET pin to -ve through a 1K resistor.
Connect Q to the output (buzzer or LED), then to ground.
Connect the clock to ground.
Connect data to ground.
now connect RESET to a key (which turns the output off), then to +ve. Connect RESET to -ve through a 1K resistor.
i built a big game buzzer in my vo-tech class once
it ran on 120v and the output was 3 100W bulbs
used some contacks, relays, wire and push buttons
it was wired so that if everyone puched the putton (there were 3 of these buttons) the first that was triggered would light and ther others would be locked out
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