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http://www.mini-minty.com
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http://www.pmillett.com/tecnical_books_online.htm
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http://elm-chan.org/works/akilcd/report_e.html
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http://mcnally.cc/amps.htm
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http://wiredworld.tripod.com/tronics/audio_level.html
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http://autotrace.sourceforge.net
Plein de plan et de PCB en allemand
http://www.stefankneller.de/elektronik/nixieplan.html#bezug
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http://vivara.net.nyud.net:8090/blog/?p=24