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Re: [TCML] Why 1000 Turns?
Thomas Schmit wrote:
I was just wondering how the 1000 turn rule of thumb was developed. Is this a purely "practical" consideration - i.e. larger number of turns results in corona discharge and insulation failure at the top of the secondary or is there a theoretical reason behind it? Or something else entirely?
I think it's just how things come out. If you were to wind a BIG coil
with really fine wire (and get thousands and thousands of turns), you'd
have a lot of inductance, and you'd have trouble getting resonance with
a practical sized top load (e.g. the fRes would be really low) Not only
that, but winding a big thing with small fragile wire would be hard.
Going the other way, using relatively few turns of big wire on a small
form runs the inductance to low.
It also has to do with the typical form length and the ease of close
Some folks have experimented with secondaries wound with a spacer, and
got good results. halving the number of turns cuts the inductance by a
factor of 4, so you need a substantially larger topload to keep the
resonant frequency the same.
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