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http://www.edn.com/index.asp?layout=article&articleid=CA46577
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http://hackedgadgets.com/2008/03/25/plasma-tweeter-audio-with-no-speaker
DIY Sound Card
http://www.electronics-lab.com/projects/pc/026/index.html
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http://www.pavouk.org/hw/usbdac/en_index.html
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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.epanorama.net/documents/audio/spdif.html