Deciding to go for a full digital design for the circuitry, the peripheral is based off of a MEMS microphone and an STM32 microcontroller doing the heavy lifting between it and a USB connection.

The coils are driven by a TBD62783A 8-channel driver chip, while an STM32 takes care of USB duties. The mechanical design of this multiplexer is just as slick as the electrical. [Petteri] designed ...