A PDM (Pulse Density Microphone) and a Raspberry Pi Pico. It appears on the computer as an audio input (I changed the name from the original).
All credit for this project to Sandeep Mistry here.
A recording of how it sounds (pretty good) is here. There's a bit of mic popping - perhaps a pop filter would help.
Applications of this technology are swirling in my mind...
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