Re: Variable Cap In Secondary?

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

Original poster: "Steve & Jackie Young by way of Terry Fritz <twftesla-at-uswest-dot-net>" <youngs-at-konnections-dot-com>

If anyone does this, put the cap in parallel with the primary tank cap for
fine tuning.  I don't believe there are any commercial ones which can
withstand secondary voltages.  If there are, they would be several feel long
and cost a fortune.

It's much cheaper to just have a bit of extra inductance in series with the
primary.  One could make two small external coils in series and vary the
spacing (mutual inductance) between them for interactive fine tuning.
--Steve
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, April 07, 2001 6:11 PM
Subject: Re: Variable Cap In Secondary?


> Original poster: "Bill Parn by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<parn-at-starpower-dot-net>
>
> I have seen variable tuned capacitors on E-Bay.  Think they are used for
> radio transmitting stuff, or whatever you can dream up.  If you could
build
> one of those such to with stand the high voltage it would be a pretty cool
> way
> to do some fine tuning.  Maybe even motorize it so that you could fine
tune
> on the fly.  I have never tried it, however have thought about wanting to
do
> it.
>
> Cheers,
> Bill
>
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Saturday, April 07, 2001 7:24 PM
> Subject: Variable Cap In Secondary?
>
>
> > Original poster: "Jake Draper by way of Terry Fritz
<twftesla-at-uswest-dot-net>"
> <cybermecium2-at-home-dot-com>
> >
> > I was looking around on the net for information about Tesla Coils and I
> > stumbled accross an About-dot-com Physics Dictionary definition stating that
> it is
> > a device to create high voltage at high frequency. I already knew that,
> but it
> > says something about a variable capacitor with the secondary to tune it
> with
> > the primary. Has anybody ever seen or heard of anything like this? The
URL
> is
> >
>
<http://physics.about-dot-com/science/physics/library/dict/bldefteslacoil.htm>h
> > ttp://physics.about-dot-com/science/physics/library/dict/bldefteslacoil.htm
> >
> >
> >
>
>
>
>