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http://ec2-122-248-210-243.ap-southea...aws.com/mediawiki/index.php/SPDIF_out
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http://www.pmillett.com/tecnical_books_online.htm
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http://www.epanorama.net/documents/audio/spdif.html
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http://mcnally.cc/amps.htm
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http://www.pavouk.org/hw/usbdac/en_index.html
DIY Sound Card
http://www.electronics-lab.com/projects/pc/026/index.html