Re: [TCML] Choosing a Secondary Diameter

["DC Cox" <resonance@xxxxxxxxxxxx>]

I have used #28 AWG heavy build on a 4" coil and achieved great results.
Especially with an nst that has been unpotted, 12 kV, 180 mA running in
oil.  I used a .05 uF MMC type cap bank.

4 ft plus sparks.

Dr. Resonance






On Thu, Jul 17, 2008 at 3:28 PM, David Rieben <drieben@xxxxxxxxxxx> wrote:

> Hi Mike,
>
> Although I don't have a wire guage turns per inch table in front
> of me at this time, I'd guess something like 24 to 26 guage wire on
> a 4" diamter secondary form should work just fine for your trans-
> former's size. As a rule of thumd, the aspect ratio (length vs dia-
> meter) should generally fall between 4 and 5 to 1, so a 4" diameter
> secondary coil that is 16" to 20" long should work fine. And
> generally around 1000 turns is what's desired. So just figure
> out what wire guage will near the 1000 turn mark within the
> 16" to 20" long range and that should be the wire guage that
> you should wrap your secondary form in.
>
> --
> David Rieben
>
> -------------- Original message --------------
> From: "Mike H" <mike8675309@xxxxxxxxx>
>
> > Very new to coiling and I'm working on getting the basic plans in
> > shape for a new coil built from some parts I have from my first coil.
> >
> > I will be winding a new secondary, and would like to size it such that
> > it is optimized for my transformer, or at least not improperly sized
> > for my transformer.
> >
> > It appears that I have easy access to Acrylic tubing from local
> > manufacturers. Thus the plan is to use Acrylic for the secondary.
> >
> > This leaves the question. For my transformer, which outside diameter
> > would be better? 4inch?, 6inch?, 8inch? bigger?
> > Does the magnet wire chosen change for different coil form diameters?
> > (or only as much as necessary to hit number of turns vs total
> > secondary height)
> >
> > My Transformer is:
> > Franceformer 12030P
> > 120v NST 12000v 30mA, 360VA
> >
> > Thanks
> > Mike
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