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Solar Spinners for Your Windowsill!

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This is an easy-to-build simple solar engine, also known as a Trimmet. We will construct a direct-drive type (as opposed to a voltage-triggered) spinner that will really go nowhere fast in direct sunlight. Perfect for windowsills and desktops that get a lot of old Sol’s rays. Many different styles are... Read more »

Battery-Heated Poncho

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What is better, heating a room or heating yourself? When you are thinking on the last option, I have a very simple method. You can use a 12-volt electric blanket. The only thing you need to do is to make a slit in the center of the blanket to put... Read more »

Hand-Crank USB Charger

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I wanted to be able to charge my cell phone, MP3 player, and other USB devices while not having plug-in power available. This hand-crank generator, originally designed by Ben Heck, ended up working the best. Read more »