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On Wed, Nov 14, 2007 at 11:46:23PM -0500, Rolf wrote:
> Did you see Olin's message a little bit ago. He pointed to this project 
> of his:
> 
> http://www.embedinc.com/pic/knli/index.htm

That thing is really cool! I've actually got plans to make myself a nice
rugged caving headlamp with a Stenlight-like design. The mechanical
aspects of the project will likely be the most difficult actually, but
having a good switcher example is still very cool.

FWIW I'm very impressed by how clean and well documented the whole thing
is. Definetely a standard to aspire too.

> It appears very nice for your purposes because it will switch-mode up to 
> whatever voltage is required fro the required current.
> 
> You may want to inspect and adapt his project for your lower current 
> requirements....

I think the nessesity of having the leds in 30 or so strings will be a
problem though. I'd have to have one switcher for each string, and
that'll be a lot of parts when all is said and done.

All the same, building one to better understand switching power supplies
is on my todo list now.

- -- 
http://petertodd.org
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