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On 6/11/18 2:09 PM, David Speck wrote:
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.
Dave
On 6/11/2018 1:50 PM, James Janota wrote:
I had an idea. After I get successful at my coil building, how hard
would it be to change it to a bipolar TC?
Or, if this one works, wind a second secondary of the same size. Either
way, you'll have plenty of work to figure out to support the
secondary(ies) and primaries, etc.
I can see taking the existing secondary, putting a second topload on it
on the other end, then mounting it horizontally.
A pancake primary in the middle - if you have enough clearance.
Tuning and mechanical support will be "interesting" - one thing is that
it's harder to control the coupling - with a conventional flat primary
and secondary above it, you can raise and lower the secondary to
decrease/increase the coupling.