Based on a Jensen #75 steam engine, which is used to drive a Lego Technic motor. The clever inventor, Thomas uses the motor in this project, to feed into a voltage regulator circuit, providing a continuous 5V charge to what ever gadget or device is plugged into the USB end, in this case an iPod.
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This latest tiny USB battery charger for your cell phone from Brando is so small that it can fit right into your pocket like a key chain, its handy and convenient to have when you’re out and about with a low battery in your mobile. What’s unique about it is that it can charge batteries of most sizes and it works as you can see in the pictures by clipping on the battery as you plug in its other end into a PC’s USB port.