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Open Source Hardware
Other cool open source projects from around the net.
theutis.com - Open-Source MP3 player to listen to your MidiBox music on.
Yampp - yet another Open-Source MP3 player.(this one has USB capabilities)
Arduino - An open-source physical computing platform very cool programmable I/O board.
Ronja - Ronja is a free technology project for reliable optical data links with a current range of 1.4km and a communication speed of 10Mbps full duplex.
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Circuits
Circuit designs that can be incorporated into projects.
RIAA Compensated Stereo Preamp - A turntable preamp board and circuit design. usefull if you want to make a Traktor mixer/Controler with an optional turntable input.