Re: Capacitor Help

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "MalcolmTesla" <tesla@xxxxxxxxxxxxx>

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


> 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


Bart, you make an excellent point about carbon traces.  I didn't know if
that would be a problem on the primary or not?  While goofing around in the
garage I made a jacob's ladder to entertain myself while working on the
tesla coil and sure enough after a short while a carbon trace formed at the
base across the wood and created a short and I had to shut it off.  I can
see how that would be a big problem on the primary if there was any arcing.
Well that blows my theory of building a new support from 1 x 2 trim board on
edge with holes drilled through it.  I guess I'll head on down to Lowes or
Home Depot tomorrow and see if I can find some 1/2" thick plexiglass strips
and build a new support for the primary.  This time I'll use more than 4
supports and drill complete holes to pass the copper through instead of
notches to lay it down on.  Maybe they will have longer than 25' spools of
copper too.  I'll take a look.

> PS. If you need any explanation of Javatc, just contact me offlist.

I'll try playing around with it first rather than just bugging you right off
the bat.

Thanks very much
Malcolm - KC


> 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....
>
>
>
>