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12v to USB adapter \ 12v to 5v transformer (great for cars)
Mini Peltier Air Conditioner (Plans)
Lithium Battery Solar USB/ iPhone/ Arduino Charger
Device Charging with a Multi-turbine (on faucet, wind, bike, while sporting and etc.)
DIY Portable Solar Powerbank (w/ 110v Outlets & USB Ports)
solar lens from TV
Home made PCB
Human Powered Phone charger
Burning Laser with Joule Thief
DIY Contactless magnetic induction bike dynamo
Magnetic induction safety bike lights. Nearly invisible design, cheap, waterproof and battery free!
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