Re: Primary coil configuration

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Krohns" <2halice@xxxxxxx>

Thanks Dr. Res,

I figured that is what you would say.  I'm going to experiment with the flat
primary first before I cut out my conical Lexan stand-offs.  It will be
interesting to see the difference.

Sincerely, Hal in Tucson



----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, April 20, 2006 1:19 PM
Subject: Re: Primary coil configuration


> Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>
>
> Yes it will work but you will get more current in the secondary with
> this dia coilform if you run a slight 15 to 20 degree inverted cone
> primary. Brighter spark output.
>
> 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
> > >
> > >
> > >
> > >
> >
>
>
>
>