Analog Mic

This week I used the rp2040 zero knockoff board because david is too cheap to buy the real thing. the circuit is rather basic it supplies my jank phantom power to the board, and then samples that into an analog out. technially speaking the data we get has no value as is it impossible to do an FFT to it without any real sample rate. I am working on making an analog amp to get better and more clear signal with a real high pass filter but that is a later issue.

To read the data we are just taking an analog signal out, but combined with this we are reading ground and subtracting that. In a perfect world ground should be zero but for some reason the RP2040 chip has its ground fluxuating ever so slightly so we take a reading of ground to stablize our signal.