I bought these for my son who likes to tinker around with a soldering gun and pieces of electronics he's salvaged from other electronic items. He says they're exactly what he was looking for and work great.
Topping D30 High-Resolution Audio Decoder With DSD Support, USB, Coaxial, And Optical Inputs, Xmos Technology, And CS4398 DAC Chip For 24Bit/192Khz Playback
10 Review
Douk Audio U2 PRO XMOS XU208 Digital Interface - USB To TOSLINK/Coaxial/Optical/HDMI IIS Adapter For DAC, Preamp & Amplifier | PCM & DSD256 Support
21 Review
Friencity Digital To Analog Audio Converter, Optical To RCA Converter, SPDIF(Toslink) Coaxial To Stereo L/R AUX Adapter W/Optical Cable For TV Amps Blu-Ray Player PS4 Home Cinema, Plug N Play
6 Review
10-Pack Double-Sided Copper Clad Laminate PCB Circuit Boards - Perfect For DIY Prototyping!
8 Review