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Build Your Own Battery Power Supply
DIY Boost Converter || How to Step Up DC Voltage Efficiently
NESBot: Arduino Powered Robot beating Super Mario Bros for the NES
Streaming video from SD card to Nokia LCD with Arduino
Dirt cheap ATtiny-85 Tv-B-Gone(switches off any TV!), plus arduino as isp
VHF-UHF RF Sniffer
Easy Android controllable, PC Interfaceable Relatively Cheap Mini Quadcopter (or Octocopter!) Drone...
Using an RGB LED to Detect Colours
Adding Custom Graphics to EAGLE PCB Layouts
Draw Electronic Schematics with CadSoft EAGLE
Turn your EAGLE schematic into a PCB