Hey I've pretty much completed a design project building a type of quiz buzzer for a school project. It is comprised of a lockout circuit so only one person can be buzzed in at a time and a time which counts down from 9 to 0. The main problem I have now though is how to supply power to it. It is designed to operate on 3.5 amps and at least 9 volts. I do have a battery holder that can provide this but I'm worried that this thing may at some point go up in flames. Could someone take a glance at my circuit and tell me if I have anything to worry about? (and if there is any way to simplify the circuit it would be great to know as well!)
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