Add this to the list of cool things you can do with your Legos. The hand crank Lego charger lets you juice up any USB-based gadget the old fashioned way, by cranking it up. It seems fairly simple to build as it uses a Lego motor to generate current which then passes through a voltage regulator and onto the USB port. Hit the jump for a video of the charger in action.
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I think this is cool! Granted, I wonder how long it would take to crank-charge my phone.
Someone, mod this so that it attaches to a hamster wheel, or something?