PCM2706 High Fidelity USB Soundcard / USB Headphones
The STM32 Makes For A Cheap DIY USB Soundcard | Hackaday
Amazon.com: Sound Module, Icstation Programmable Sound Chip for Greeting Card 8M USB Charging Sound Board for DIY Creative Gifts for Father's Day, Compatible with Windows and Mac Computer : Electronics
DIY: USB Sound Card - Make:
USB soundcard with PCM2902
Make a Sound Card with PCM2704
Make a simple USB soundcard with the PCM2704 - YouTube
Gainstrong 3.5mm USB 2.0 Audio Interface Sound Card Support USB External Sound Card and DIY USB Sound Card - China Sound Cards and Sound Card Studio Recording price | Made-in-China.com
Adapting a USB sound card to work with a studio condenser mic
JEDAC - yet another take on a DIY high-end USB Audio DAC