DIY USB sound card with PCM2702 (quite same as PCM2902)
http://www.myexposition.com/diy/usbdac/overview.html
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http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects
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http://www.diyaudioprojects.com/Chip/AMP6-DIY-T-Amp-Kit
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http://perso.orange.fr/jm.plantefeve/sche.html
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http://www.ptsoundlab.com/tubes/amplis/tubesamp.htm
spectrum analyser for cheap
http://www.domenech.org/bt878a-adc/index-e.htm
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http://www.anykits.com/catalog/index.php
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http://www.arduino.cc/blog
Cheap ARM7 board (and more)
http://www.futurlec.com/ARM2103_Controller.shtml
pleins de docs sur les mémoires,bus .. et l'électronique en général
http://perso.wanadoo.fr/arsene.perez-mas