Paul Burridge wrote:
Why not just copy a suitable proprietory schematic? What's the problem
with that?

Yes, that's a good idea, however it is not always possible to decipher
values of the elements, number of turns, type of magnetic material and so
on. You cannot determine board layout, either. I believe it is relevant to
the circuit not to start oscillating.

--
Pawel Stobinski SQ9NRY
Republic