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Em 11/06/2018 18:09, David Speck escreveu:
James,
A coil that is suitable for single ended drive "could" be used in a
bipolar arrangement. The old Cenco bipolar coils were built this way.
However, I think that you would be better off with a secondary with a
gap in the center where the windings are in the "shadow" of the primary.
Secondary windings that fall within the windings of a typical
cylindrical primary would not add any useful voltage to the output of
the coil.
If you used a flat pancake primary, this effect would be minimized,
but I can't ever recall seeing a bipolar coil with this sort of
primary arrangement.
There is no problem with windings of the secondary coil inside the area
covered by the primary coil. If there are more turns in the secondary
than in the primary there is certainly a transformer action. Flat
primaries are used just because they result in a better range of
coupling coefficients and better insulation. I think that all the
bipolar coils that I have seen use a cylindric primary coil and a
continuous secondary coil. Tuning is different because the capacitive
loading of the secondary coil is usually different, but this is a
question of adjusting the sizes of the two terminals.