Re: Primary coil configuration

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

I didn't think pupman.com allowed attachments? I would
think .jpg attachments are fairly low risk.

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Dr. Resonance,
>
> I am building my first coil.  It has a 4" secondary.
>  Just this
> afternoon I wound a flat primary for it and then
> read your
> email.  Will a flat primary not work with 4" coils?
> I plan on
> powering it with 15KV, 90mA.
>
> []
>
>
> Hal in Tucson
>
>
>
> ----- Original Message -----
> From: "Tesla list"
> <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
> To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
> Sent: Wednesday, April 19, 2006 4:44 PM
> Subject: Re: Primary coil configuration
>
>  > Original poster: "D.C. Cox"
> <<mailto:resonance@xxxxxxxxxx>resonance@xxxxxxxxxx>
>  >
>  >
>  > If you run a 4 inch dia. sec coilform use a 15 or
> 20 degree inverted
>  > cone primary.  If running a 6 inch dia. sec
> coilform use a flat
>  > Archemedian (expanding) spiral.  Overcoupling is
> a big problem for
>  > most beginning coil builders and it generates
> multiple headaches like
>  > racing sparks, etc.  Keep it simple and it will
> work right the first time.
>  >
>  > Use 1.3 to 1.5 x Cres for your MMC cap value and
> you will have a nice
>  > performer.  The 6 inch dia. coil will give you
> better performance.  V
>  > = -L x dI/dt.  Inductance, L, is proportional to
> the square of the
>  > radius of the coil so bigger is better.  Use #26
> AWG for a 6 inch
>  > coilform and #28 AWG for a 4 inch coilform.
>  >
>  > With a reasonably large toroid, ie, 20 x 5 or
> equiv. modern
>  > transmission line theory doesn't apply much to TC
> building.
>  >
>  > Dr. Resonance
>  >
>  > >Hi All,
>  > >    I'm in the process of designing my first
> coil.  I'm a junior in
>  > > EE and it just caught my intrest while I was
> researching HV
>  > > transmission lines. I have a 15kV 60mA NST and
> I'm reading as much
>  > > as I can about the rest of the design before I
> actually
> buy/build anything.
>  > >    My question is what is the difference
> between making the primary
>  > > wind outward away from the secondary opposed to
> winding vertically
>  > > keeping the windings all the same distance from
> the
>  > > secondary.  Also what does primary placement
> around the secondary
>  > > effect.  If I move the primary up to the middle
> of the secondary
>  > > what will that effect?
>  > >
>  > >~Farmer
>  >
>  >
>  >
>  >
>
>


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