Re: Extra coil? And, why no e-mails?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:

 > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
<Beans45601-at-aol-dot-com>
 >
 > Also, What is an Extra coil and
 > what does it do for the tesla coil?

If you split the secondary coil of a Tesla transformer in two parts
and move one of them away, keeping it directly connected by a wire
to the part that still forms a transformer with the primary, you get
the extra coil.

So far, no particular advantage. The system still behaves as a
regular Tesla coil if tuned correctly (the tuning changes with the
splitting).

The things start to become interesting if you try to do this with a coil
designed for fast energy transfer, with tight coupling. By moving the
high-voltage end of the secondary away you may be able to make the
system work without "racing sparks" (not demonstrated yet) or at
least without sparks between the terminal and the other parts of the
system.

But tight coupling also means high capacitance between the primary and
secondary coils, what keeps some energy trapped in the primary-secondary
system, not available at the output terminal.

If an extra capacitor is added across the secondary coil, you have
a triple resonance system, where it is again possible to have very
efficient and fast energy transfer to the terminal.

More about this can be seen at:
http://www.coe.ufrj.br/~acmq/tesla/magnifier.html

If this results in clearly observable improvement over a regular system
with just two coils, when the objective is making sparks, was not yet
demonstrated.

Antonio Carlos M. de Queiroz