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JEDAC - yet another take on a DIY high-end USB Audio DAC
Mini Free Drive USB Sound Card Chip DAC Decoder Board for PC Laptop Power Amplify Circuit for PC Computer Sound System Speaker USB Powered - Newegg.com
Make a Sound Card with PCM2704
Make a Sound Card with PCM2704
USB soundcard with PCM2902
MINI USB DAC Supports Mobile Phone OTG USB Sound Card With MIC Amp DIY | eBay
PCM2706 High Fidelity USB Soundcard / USB Headphones
Amazon.com: HW-406 Bluetooth Stereo Module, Wireless Audio Module, for Bluetooth Audio Reception Audio DIY Modification USB Sound Card : Electronics
DIY USB sound card with Motherboard's chip | Electronics Forum (Circuits, Projects and Microcontrollers)