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From: Greegor on 3 Feb 2010 05:10
On Feb 2, 5:37 pm, mike <spam...(a)go.com> wrote:
> kiqyou_vf wrote:
> > Hello, I would like to build a simple crank powered USB charger. I
> > have very little experience in electronics, but I think this is how I
> > would do it:
> >http://docs.google.com/View?id=df4479zw_145npdcsbmj
>
> > Any guidance concerning components types/specifics and general design
> > would be greatly appreciated. Thanks a lot for reading!
>
> Some hand-crank flashlights have a cellphone charger output.
> Spend $5 and save yourself a bunch of hassle.

The $ 5 ones might be a hassle too, if they're too cheap!

Emergency gear that breaks easily because it's
too cheap would be a problem when you need it.

The Red Cross labeled ones are more like $ 30.

That camiselectronics page with the tree mount
Mortley Sprague Hand Crank generator (HD550-HD600)
is now a dead page, but I suspect that it would be way
too expensive except for military use.

Can anybody find a source/price for that unit?



Notice that the cheapie rechargers are being
promoted one Chinese outfit/trade group as a
promotional ( advertising giveaway ) item
like cheap clocks or ball point pens.
From: Archimedes' Lever on 3 Feb 2010 08:40
On Tue, 02 Feb 2010 23:08:04 -0800, "JosephKK"<quiettechblue(a)yahoo.com>
wrote:

>On Mon, 1 Feb 2010 19:07:48 -0800 (PST), kiqyou_vf <sorensong(a)gmail.com> wrote:
>
>>Hello, I would like to build a simple crank powered USB charger. I
>>have very little experience in electronics, but I think this is how I
>>would do it:
>>http://docs.google.com/View?id=df4479zw_145npdcsbmj
>>
>>Any guidance concerning components types/specifics and general design
>>would be greatly appreciated. Thanks a lot for reading!
>
>Please take this to sci.electronics.basics.


Please stop directing folks around the group(s).
From: Joel Koltner on 3 Feb 2010 12:15
"Greegor" <greegor47(a)gmail.com> wrote in message
news:89721049-50e7-49cc-81bb-ba04d52edbe5(a)19g2000yql.googlegroups.com...
> The Red Cross labeled ones are more like $ 30.

I rather wonder if they really did many tests on them, though, or just took a
large payment in exchange for a manufacturer to slap their logo on it in the
hopes of better sales.

I practice, I think that crank-powered radios are more a novelty than a true
emergency tool -- radio receivers draw so little power that you usually get
some tens of hours off of a pair of "AA" batteries, so a pack of, say, 24 "AA"
batteries will more than last you through all but the most extreme disasters
(e.g., hurricane Katrina) anyway.

Personally I'd go for a good-quality 5W solar panel and a handful of
rechrageable AAs...

---Joel

From: Greegor on 11 Feb 2010 20:33
http://www.camiselectronics.com/handdrivengenerators/handcrankgenerator.php

The above link / subpage stopped working before Feb 3.
Apparently that page was moved to the following link:

http://www.camiselectronics.com/handdriven.php

This link works for that heavy duty looking
Mortley Sprague Hand drive generator (HD550/HD600)
( As of Feb 11, 2010 )
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