In article ,
"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

Only two ideas from me, and they seem weak.

A half turn means the current goes in and out on separate sides. That
makes one turn of inductance perpendicular to the rest of the turns that
would skew the magnetic field.

If it is a powdered iron core, the volts per turn could be high enough
that it conducts electricity.
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