Bike power (Re: solar power)

[joerg]

Am Mo  11. Februar 2008 schrieb Schmidt András:
> Today we were talking about new generation of portable personal 
> computers (yes, that is OpenMoko :-) with friends. Our idea was to use 
> it as cyclocomputer (That idea has already appeared on the wiki or in 
> the list somewhere). We were wondering whether it would be possible to 
> charge the phone using a dynamo (http://en.wikipedia.org/wiki/Dynamo).

No problem. Rectifier and a high quality step down switched regulator will 
easily provide the 5V/0.5A USB-power to operate/charge the NEO. You might 
even get off with a low drop linear regulator (78L05). A 25V/2W Zener (or 
similar overvoltage protection) for Vin might be a good idea.

j