Bike power (Re: solar power)
joerg.twinklephone at gmx.de
Mon Feb 11 01:32:12 CET 2008
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.
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