Raspberry Pi X20 HIFI Audio Kit (X20 ES9028Q2M DAC Board,X10-PWR Power – Geekworm
Cirmech Pcm2706 Hi Usb Soundcard Diy Kit Usb Dac Spdif Android Compatible Microusb Windows Without Driver Plug And Play Wm-017 - Headphone Amplifier - AliExpress
MCHStreamer - USB Audio Swiss-Army knife - Multichannel PCM/DSD/PDM/ADAT/TDM/SPDIF interface
New DAC DIY KITS for CS4398 + CS8416 24bit / 192KHZ Decorder USB Optical Input | eBay