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You can do all that without the gates, just use a diode from each switch to combine their outputs and a single transistor to invert the result (if necessary) before triggering a monostable. If a 556 (like two 555s in one package) is used, the first can set the beep length and the second make the beep tone.
Brian.
Thanks, Brian. I'll try that out.
On another note, I spent two hours tonight attempting to wire one digit on a proto board, but it was a disaster. Got it all wired, but it didn't function at all.
I chalk the problem up to everything being too tiny for my inexperienced hands, and I most likely fried the 4511 at some point. Need DIP sockets for sure.
I'm going to take the time to learn the PCB Express software and have a circuit board made.
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