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Re: Capacitor Help



Original poster: "MalcolmTesla" <tesla@xxxxxxxxxxxxx>

Bart,

I got to thinking some more about what you said below about the arcing
across the primary.  I'm certainly not questioning your experience and know
how but wouldn't it be a shorter path for the current in the primary to just
flow around the coil than arc across it?  Obviously not since arcing occurs
and is an issue.  I'm just not sure how.

Anyway I got to thinking what if I can't find some thick plexiglass
tomorrow.  Could I just use plastic wire holders?  Do all the metal screws
used in such a setup pose a problem?  Perhaps affecting the magnetic field?
See these two pics for what I'm talking about.  I quickly just mocked up a
piece of my idea.
http://www.v8-ranger.com/temp/tesla/8.jpg
http://www.v8-ranger.com/temp/tesla/9.jpg

This would insulate the primary from the wood.  Not by much but I think
enough to stop carbon traces from forming.

Let me know what you think

Thanks again
Malcolm - KC

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, December 13, 2005 10:31 PM
Subject: Re: Capacitor Help


> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi Malcolm
>
> Thanks for taking all the pictures. They are certainly a great help.
> The primary is my #1 concern. Don't lay the primary tubing into those
> wooden runner notches, not even with varnish on the form. You "will"
> eventually, and soon, arc into the runners and carbon track a
> distance through the wood. I use wooden forms myself, but, I
> "learned" to add a distance between the wood and the tubing to
> prevent just this problem. Wood is great for cost and machinability,
> as long as you adhere to high voltage physics. I use plexiglas
> runners between my wooden runners and the actual coil. On some other
> primary's, I've used an actual plastic cylindrical standoff (approx.
> 1/4 inch from primary to wood).
>
> Your runners look "prepared" for the tubing to just lay down and set
> inside the notches. I would recommend letting the notches serve as
> the "position point" for the tubing, but find a pliable insulator to
> cut to width and length of the runners which you can keep between the
> windings and runners (at least 1/8 inch thickness).
>
> Just for reference, I've caused a 4 inch length carbon track in G10
> disc material (everything is conductive when conditions are right).
> And for some reason, we coilers always seem to find those conditions.
>
> Best of luck,
> Bart
>
> PS. If you need any explanation of Javatc, just contact me offlist.
>
> Tesla list wrote:
>
> >Original poster: "MalcolmTesla" <tesla@xxxxxxxxxxxxx>
> >
> >----- Original Message -----
> >From: "Tesla list" <tesla@xxxxxxxxxx>
> >To: <tesla@xxxxxxxxxx>
> >Sent: Tuesday, December 13, 2005 7:29 PM
> >
> >
> > > Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > Hi,
> > >
> > > You should start thinking about "tuning".  The frequency of the
> > > primary circuit needs to be tuned to the same frequency as the
> > > secondary circuit.  Now is a good time to get a rough idea of the
> > > tuning to be sure you won't end up with a coil that will not
> > > tune.  So it is time to do the math or let Bart's program do it for
you...
> > >
> > > We know that primary capacitance is 8.33nF.  From the details you
> > > give below, we can calculate the maximum inductance of the primary
coil.
> > >
> > > Lf = (N x R)^2 / (8 x R + 11 x W)
> > > Lf = (7.5 x 6)^2 / (8 x 6 +11 x 6) = 17.8uH
> > >
> > > The frequency is:
> > >
> > > Fo = 1 / (2 x pi x SQRT(L x C))
> >msnip....
>
>
>
>