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Re: [TCML] Secondary and Primary Assistance


Be sure to get the double-build magnet wire.  It handles the higher turn to
turn voltages better --- these potentials are much higher than an electric
motor which usually uses single build wire.

You can get the best price by ordering it direct from Fay Electric in
Illinois.  Call 630-530-7500 and talk to Don Novak.  Tell him D.C. Cox sent
you and he will take good care of you.
Their wire is excellent quality for Tesla coil work.

Dr. Resonance

On 3/18/08, Mike H <mike8675309@xxxxxxxxx> wrote:
> Thanks for the image.  I hope spring is good as well.  Just got 5" of
> snow over the last two days... oh well, it'll melt.  You'd be quite
> surprised at the changes in those cities you mentioned in just 8
> years.  Take a look at http://maps.google.com and use the streetview
> to visit your old stomping grounds.  Most of the images, are within
> the last 2 years and they have fairly good coverage of our area.
> Dr. Resonance mentioned the following, which I believe I'll use as a
> starting point based off the NST that I have to work with currently:
> >Use a height/dia ratio for the sec coil of 4 or 4.5:1.  Use the largest
> dia
> >sec you can as the potential is Vsec = -L x dI/dt.  In short, keep the
> >inductance of the sec large.  Even with small NSTs a 6-8 inch coilform
> dia
> >gives excellent performance.  Most experimenters prefer around 1,000 to
> >1,200 turns for optimum performance.  Example, if you use a 6" ID PVC
> tube
> >with 6 3/8" OD, then with a 4.5:1 H/D ratio, this gives you a winding
> length
> >of approx 29 inches.  Divide this by 1,000 turns which provides a wire
> dia.
> >of .029 inches.  Use a "double build" enamel magnet wire such as
> >Polythermalize (Beldon).  Closest one for this example would be # 21 AWG.
> >You could also use 22 AWG.
> With that secondary design, I should then be able to optimize my
> primary to match it.  With the Primary design finalized I can then
> determine the physical dimensions for the base I'll be setting it on.
> On Mon, Mar 17, 2008 at 8:44 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
> > Ok Mike, I thought I read the primary was 5.5" inner diameter. Anyway,
> >  no problems really. Your coil seems to work as it should for the power.
> >  Re-applying coating to fix the damage isn't out of the question. A new
> >  coil isn't going to change a whole lot as far as sparks are concerned.
> >
> >  For primary dimensions, this is how I do it. Seems a simple thing but
> >  oddly it's not.
> >  http://www.classictesla.com/java/script/primeas.gif
> >
> >  Hope MN has a nice spring this year. I lived there 10 years and
> returned
> >  to CA 8 years ago. Lakeville, Prior Lake, Elko, and Hopkins were my
> >  residences while in the cold country (working in Eagan and Minnetonka).
> >  I love MN! I'm a die hard Purple People Eater!
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