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Evil Mad Scientist Shop: DIY and open source hardware and software for art, education, and world domination.

The Electronic Goldmine stocks millions of unique and hard to find electronic circuits, robot kits, solar kits, flashlights, LED, LEDS, motors, switches, transformers, motors, solenoids, relays, switches, sensors, power supplies, batteries, solar pan...

Robot schematics, books, and circuits for mini-sumo, line-following, BEAM, and electronic projects. DIY instructions on making robots at home. Basic help and tips on how to build robotic sensors. Homemade autonomous bots for a hobby! By David Cook.

Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.

RobotShop, the World

Pololu is your source for robot kits, robot parts, robot electronics, and custom manufacturing services, including custom laser cutting and mylar solder paste stencils for SMT soldering.

Educational kits and gadgets for the Geek at heart.

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Devoted to providing quality robotic parts and flexible solar cells at affordable prices.

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Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.