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GitHub - kiffie/rpi-i2s-spdif: Software S/PDIF audio output for Raspberry Pi using the I2S interface
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PIHI HiFi Digi+ Digital Audio Sound Card I2S SPDIF Optical Fiber Expansion Board for Raspberry pi 2 Model B/B+ / A+ : Amazon.ca: Electronics
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GitHub - kiffie/rpi-i2s-spdif: Software S/PDIF audio output for Raspberry Pi using the I2S interface
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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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