S/PDIF connectors and making your own MB S/PDIF connector - VideoHelp Forum
Motherboard: Is this a 5v 3pin aRGB header? : r/techsupport
Add S/PDIF Coaxial output to your motherboard simply and cheaply | Super Best Audio Friends
What Is S/PDIF? A Basic Definition | Tom's Hardware
Soekris dam1021 S/PDIF & USB Board | Dimdim's Blog
Amazon.com: StarTech.com USB Sound Card w/ SPDIF Digital Audio & Stereo Mic – External Sound Card for Laptop or PC – SPDIF Output (ICUSBAUDIO2D),Black 0.6" x 1.8" : Electronics