Re: How to make a homemade inductor?

Rich Grise wrote:

OK, here's one: Is there a discontinuity from 0 to >0? Or is that impossible to determine, because an actually zero gap can't be made
with separate Es and Is? 

Maybe what would appear as a discontinuity could be accounted for by
their interleaving in the other case. Hmmm... :-)

Interleaved E's and I's get pretty close to a zero gap core. Tape wound toroids d a bit better, approaching the effective permeability of the metal. Alternate stacks of two or three E's and I's act like a bit more gap. Stacking all the E's and putting the I's on top act like more gap. Then you add more by putting spacers under the I's. But once the spacer is more than a few mils, it dominates the total gap and the approximate proportionality I mentioned takes over.
.

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