On Wed, 25 Aug 2010 11:09:35 -0500, "amdx" wrote:

Several years ago while making inductors for tuning a class E amplifier we
end up with a 4-1/2 turn inductor. The inductor used a 3F3 potcore, gapped I
think,
but it has been awhile. The inductor was driven hard but below saturation.
The problem; the 1/2 turn got HOT. Four turns or five turns were ok.
My physicist friend had an EE verify the problem 2000 miles away.

So, can anyone tell me why 1/2 turn would make such a difference in the
heating?

Thanks, MikeK


I think it's forcing a substantial portion of the flux to pass through
half of the core and thus increasing the core losses.

There's a half turn technique used in transformer design that ends up
with two half turns in parallel IIRC. Maybe you could use that.