Properly wired up, the guts look like yeh...

... and after a belly flop, a 16-pin Transient module like hey.

Finally the XMOS-based USB transceiver board with twin clocks; and the Asahi Kasei AKM AK4114VF digital receiver chip adjacent on the main board.

The S/PDIF inputs are transformer-coupled, the 22'000µF caps proper Epcos issue and a 115/230V switch on the small power board makes for universal AC happiness.