Breeze Audio USB SPDIF converter (optical transmitter swap) | Digital Sources, DACs, and Computer Audio
Douk Audio U2 XMOS XU208 Digital Interface, USB to TOSLINK Coaxial/Optical Audio Adapter, for DAC/Preamp/Amplifier, Support PCM & DSD64 (Upgrade Version): Amazon.com: Industrial & Scientific
Nobsound XMOS U8 Async USB to Coaxial Optical Digital Interface I2S PCM/DSD 0.1PPM TCXO - Price history & Review | AliExpress Seller - Nobsound Official Store | Alitools.io
USB to SPDIF Converter Toslink Coaxial DTS AC3 PCM 3.5mm Jack + 1.5m Optic Cable | eBay