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https://blog.podkalicki.com/attiny13-8bit-mono-class-d-amplifier
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http://www.georgegardner.info/electronics/class-d-avr.html
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https://github.com/audiyofan/jx12-project
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http://www.musikding.de/index.php/cat/c138_Sheet-metal-enclosures.html
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http://www.angelfire.com/electronic/funwithtubes/Amp-Phase.html
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http://en.wikipedia.org/wiki/Valve_audio_amplifier_-_technical
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http://www.diyaudioprojects.com/Chip/AMP6-DIY-T-Amp-Kit
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http://www.troelsgravesen.dk/Diy_Loudspeaker_Projects.htm
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http://www.subatomicglue.com/mintymic/#protoboard
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http://www.avrfreaks.net/index.php?mo...t×tamp=2007-08-10%2015:10:40