USB-player-dat
https://www.instructables.com/External-USB-audio-card-with-optical-SPDIF-POF-in/
- PCM2906-dat -> DOUT -> TX -> FT300T-dat ->
- FT300T-dat -> RX -> OPA2308-dat -> DIN -> PCM2906-dat
https://www.instructables.com/External-USB-audio-card-with-optical-SPDIF-POF-in/