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bike power supply

2007-02-10 01:00:56.094319+00 by Dan Lyke 4 comments

Just helped a friend who's into randonneurring hook up a bridge rectifier, a 7805 voltage regulator and a capacitor to a USB plug so that they could run their GPS bike computer off of the hub generator on their tandem, so the computer would actually run long enough to log a full bike ride. 7805s take all the fun out of circuit design, I tell ya.

[ related topics: Graphic Design Maps and Mapping Bicycling Bicycling - Tandem ]

comments in ascending chronological order (reverse):

#Comment Re: made: 2007-02-10 13:30:06.344724+00 by: meuon

7805 -No crowbar circuits, adjustments pots, zenier diodes... nice little voltage regulator. - They must be taking -long- bike rides.

#Comment Re: made: 2007-02-10 17:53:43.302421+00 by: Dan Lyke

The P-B-P must be finished in 90 hours to count, the Furnace Creek 508 has to be completed in under 48.

Normally they're just knockin' down 200 milers, which at 12 hours or so is on the outside of what a Garmin Edge 305 will do in theory, and in practice appears to be quite a bit more than it'll manage.

#Comment Re: made: 2007-02-11 14:00:32.895797+00 by: meuon

Those are way above of my range/speed. It's been too cold for me to ride much, but I do get out some mid-day for a quick 5-10 miles some. I'm still considering a lightweight solar repowered geek survival pack and taking some long, slow trips. I'll remember the 7805's. Might be handy.

#Comment Re: made: 2007-02-12 02:53:11.588414+00 by: meuon

Poking around more, found: Randonneurs USA and liked what I saw. Then I found Audax Atlanta - 130 miles in 13 hours. That's probably at the limit of what I can get my ankles to do.. but that's a do-able day, just barely. I need to start riding 15-30 miles per day again.