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Back in October 2010 Ben Heckendorn discovered that a hand-cranked LED flashlight had enough juice to recharge his smartphone. He recently revisited this idea on his show and updated the hack by adding a simple voltage regulating circuit using a Zener diode and a 100hm resister. He also added a USB port to plug in a microUSB recharging cable. (via electronista)

Hand powered smartphone charger from an LED flashlight

Adam Flaherty

I make cool stuff and write about other people making cool stuff on makezine.com. If you have something you think I should see, send me a tip.


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