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Important note: Each bot only listens to one frequency so each bot will be tuned for just one frequency.
To be a little more descriptive, my initial method would basically convert amplitude of a filtered frequency to voltage. I wanted to try and keep everything made up of cheap passive components since the audio quality doesn't matter
Idea: Could I not connect a mic to a crystal that's tuned to the frequency I want to listen for? When the mic picks up that frequency the crystal would resonate and generate an output that can be amplified. This would eliminate the need for filters.
The 567 would work if it had a variable output. I need the output to be proportional to the inconing signal's amplitude.
[...] I'm trying to figure out a cheaper solution than an electret mic.
Perhaps someone can help me calculate just how long a 1F capacitor would run a circuit at 2V regulated, I=3mah? I can charge the cap >2V to keep voltage high enough for the regulator if necessary.