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 updated
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.
View more articles by Adam Flaherty
