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I found this great instructable about hacking dynamo keychain flashlight into a nice 5v power supply. They use a MAX756 step-up DC-DC converter and a few other parts to get it all working. This looks like a really interesting idea for remote applications where power isn’t readily available or a solar panel would be too bulky or fragile.

Now you can have a regulated power supply constantly at your fingertips with NO batteries to replace or recharge! This Instructable shows you how to modify a keychain dynamo flashlight into a lean mean supply that can replace batteries for any projects requiring quick 5 volt direct-current (5V DC) power.

More about making a Battery-free 5 volt project power

In the Maker Shed:
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MintyBoost USB Charger Kit v1.2 – Build your own MintyBoost: a small & simple (but very powerful and very MAKE-like)USB charger for your iPod (or other mp3 player), camera, cell phone, and any other gadget you can plug into a USB port to charge.

Marc de Vinck

I’m currently working full time as the Dexter F. Baker Professor of Practice in Creativity in the Masters of Engineering in Technical Entrepreneurship Program at Lehigh University. I’m also an avid product designer, kit maker, author, father, tinkerer, and member of the MAKE Technical Advisory board.


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