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WM8804G HIFI DiGi+ Digital Sound Card I2S SPDIF Optical Fiber RCA I2S Interface FOR Raspberry Pi 3 /2 B B+ A+ volumio|Replacement Parts & Accessories| - AliExpress
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Archimago's Musings: MEASUREMENTS: JustBoom Digi S/PDIF HAT for Raspberry Pi. (Plus "Why isn't digital audio 'just ones and zeroes'?" anxiety...)
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