Let's say I had a board running on 3.3v and I wanted to sample analog voltages from an electret or dynamic mic.
From what I've read they output at most a few tens of mv. Obviously if I just attached one of these to an analog pin I would not have much success reading them. And typically one might use a mic preamp to allow them to be read.
But let's say that I don't have or can't use one of those.
Is it possible to stick a voltage divider on AREF to bring Vcc down from 3.3v to say, 50mv, and then get 8 or 12 bits of analog precision reading that mic directly?
(I guess the mic would output +- mv, so that would have to be offset to stay positive too.)
