Proud of this one:

Super-tight case for esp32, targeted to use for squeezelite

ESP32-DevKitC-VE (https://www.amazon.com/gp/product/B087TNPQCV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)

Squeezelite: https://github.com/sle118/squeezelite-esp32

And I used the diagram there for the GPIO driven SPDIF

It works!  Microcontroller logitech media server renderer, plugged into stereo receiver SPDIF input, and looks goooood in clear petg…hehe

Case would work for many applications…

100nF GPIO ----210ohm-----------||---- coax S/PDIF signal out | 110ohm | Ground -------------------------- coax signal ground