Re: Pri/Sec spacing

Subject:  Re: Pri/Sec spacing
  Date:  Mon, 9 Jun 1997 22:06:45 +0500
  From:  "Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
    To:  Tesla List <tesla-at-pupman-dot-com>

On Fri, 6 Jun 97 08:55:39 EDT Gary Lau
<lau-at-hdecad.ENET.dec-dot-com> wrote;

> I myself am still working on my first coil and was planning on
> mounting a flat 1/4" tubing primary BELOW a 1/4" x 2' x 2' sheet
> of plexiglass, and mounting the secondary above the sheet.  This
> would seem to afford some good protection against primary strikes
> and at the same time, make primary tap adjustment very
> accessable.  As I am now preparing to start on my secondary
> (4.25" x 20"), I'm wondering how close to the end to start my
> winding, and whether I might not be able to get the secondary
> close enough to the primary using this geometry.

Most people start the secondary windings a 1/2 inch to 1 inch from 
the end of the tube on a coil your size. The idea of puting the 
primary under a sheet of plexiglas is rather unique and sounds like 
it should work well.

> What kinds of pri/sec spacings to other folks use?  If the
> closest I need to come is 1 1/2", then I should have no problem.
> If it matters, I'm planning on using a pair of OBIT's to power
> things.

I would say except for micro or mini Tesla coils that you don't want 
to space the primary any closer than 1 inch from the secondary. 1 1/2 
inch space is typical of most medium to large coils.


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                           Alfred A. Skrocki
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