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This hand charges a supercapacitor to power an LED when you turn the .

Hand have a tiny little dynamo generator built in. Just the handle a few times and hit the button for a cheap, reliable, eco-friendly source of . Sure, they’re nothing new but modern models do much more than just produce .

How to Make a Wind Turbine from a Hank eBook.

In this article we discuss a simple hand- LED mechanism able to up a single white LED up to its maximum intensity. This hand incorporates a geared stepper-motor and an integrated electronic circuit…

One Minute Activities for Kids | Spaghetti Box Kids

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