What defines LL on toroids? I mean, if I send a wire down the center of one, is it zero? Nothing can be zero...
If it were an air core toroid, then it would be the ratio of a few diameters, probably with a logarithm I'm guessing. And if it's a ferrite core with such and such permeability, then it's roughly that many times less leakage, right?
Additional question: can I calculate LL on, say, a dual C type core? What defines that? Ugly geometry-dependent math I'm guessing, but how about ballparks?
Reason I ask is, I tried this:
I contemplated wrapping a slab of copper sheet around the core (to short out the leakage flux), but after a few minutes operation the primary winding was too melted to try anything more. On a related subject, I now despise proximity effect. ;-)
Tim