> I'd say it can be done with one transistor and
> a very small coil with two windings...
> :o)
> -Roman


I tend to agree - with reservations.
Part of the reason for my doing it this way was to bring out the good ideas.
A self oscillating "ringing choke" / flyback converter is indeed one
possible solution.

Tell us how.
How many of the design requirements are met by this.


            Russell McMahon

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