@Okechukwu, my completely rusted memory banks, am sure many on the list know this design as well : Black Mamba DC Dyno = 2 Amp Zener Diode in parallel with dynamo output and 10-50uF/100v capacitor = 5.2 volt regulated output @250mAmp = charge phone. Zener Diode will regulate the over voltage if the dynamo speed is producing more output while phone will not charge if underspeed.? The regulator circuit is an old one dating back to early 80s? Not to discourage the innovator, I think he/she should step up the challenge a bit more at Uni Level? :-) 

 

2009/7/28 Okechukwu okechukwu@gmail.com