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 PD controller on-board the STM32 MCU performs as a UCSI platform policy manager (PPM). The necessary USB Type-C and Power Delivery (UCPD) peripheral is available in various STM32 MCUs. The ...

If you need a cheap, simple USB sound card that you can hack away on, this might be the one for you. If you need something more suitable for a vintage PC, however, consider this instead.