- on Power Supplies
- Published in issue 7/2011 on page 39
USB Charger using Pedal Power
Keen cyclists will no doubt have sometimes thought that it would be nice to have some kind of on-board power supply to charge a mobile device such as a phone or a satnav while on the road. The circuit described here shows to how this can be achieved quite simply, using power from the bicycle’s dynamo and a switching regulator.