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Simple Solar Water Filter
Airsoft Target System
Make hobbyist PCBs with professional CAD tools by modifying "Design Rules"
Draw Electronic Schematics with CadSoft EAGLE
Understanding Motor and Gearbox Design
Building Small Robots: Making One Cubic Inch Micro-Sumo Robots and Smaller
How to reverse engineer a schematic from a circuit board
Arduino on all sorts of Atmels
Arduino Strobe / Stroboscopic Lamp