Daily Archives: August 4, 2013


In this post I describe how I made a USB smartphone charger for a hub-dynamo-equipped bicycle. The idea came from multiple sources, including Mr. Howdy,  Arenddeboer.com, and Peter. But they assume the person making the charger knows how to read a circuit diagram. I cannot understand a circuit diagram. If you’re like me, […]

DIY Bicycle Dynamo USB Charger for Smartphones and Battery Packs