>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of enkitec@gmail.com
>Sent: 12 October 2007 05:08
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE]:: Boost converter challenge.
>
>
>
>	Here is a circuit claiming 65% efficiency:
>
>	http://elm-chan.org/works/led2/report.html
>
>	Mark Jordan
>

Thats a neat little circuit. Efficiency may be improved by using smaller current sense resistors and biasing Q2 to compensate, at the cost of a few more components.  Custom magnetics may rule it out for Russells application, unles a suitable POTS component can be located.

Mike

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