Re: toroid capacitace(bi-polar coil) design

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Nolan Moore by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tmoore-at-erie-dot-net>

 Hi Ed and howdy to all,

     This is Nolan, I will elaborate on my tesla coil design more.  There
are
 2 separate secondary coils. they are 3.5" in diameter and wound 17.25" with
 awg28 enamel wire.  There are 2 separate primary coils wound with 6awg
solid
 ground wire inner diameter measures 5.825" and is spaced .25" between turns
 for a total of 6.75 turns max.   The wire is mounted in plexi-glass
 supports.  What I would like to do is REMOVE the inner  turns to give more
 clearance between the coils but I need to know if I will have enough turns
 to tune the coil.  I nave 2 new toroids they measure 21" in diameter and
 4.5" in the cross section. Are those toroids to big and streamers wont
break out?
  My tank cap are 2 rated 0.03uf at 35kv for a
 total of 0.06uf at 35kv, I could add one or 2 more for 0.09uf or 0.12uf, if
 need be.  But if its close with taping the primary coil ill make smaller
 toroids.  The coils will share the tank cap and same static spark gap. the
power supply are three 7.5/60 franceformes wired in parallel they are feed
through a variac and a line filter, I also constructed one of terry's nst
protecion filters. Everything has been put in to the same box.  Is it
dangerous to have the tank circuit that close to yourself????? But its not
like its right net to each other.  Here are some pictures I just posted

http://www.hot-streamer-dot-com/nolan/minicoil/revampintotwin/

So if I remove 2
of the inner primary turns resulting in a inner diamiter of  7.75" and max
turns of 4.75 I calculate that the primary coil will be taped between 3.9
turn to 4.25 turn.  By the way I do use you tesla cal. allot I also have
added al allot of stuff and modified some of it. I love it thanks for
creating that tesla spread sheet! Thanks for your help!

Sincerely,
Nolan Moore


> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Tuesday, August 13, 2002 7:53 PM
> Subject: Re: toroid capacitace(bi-polar coil)
>
>
> > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Esondrmn-at-aol-dot-com>
> >
> > In a message dated 8/12/02 6:53:58 PM Pacific Daylight Time,
> tesla-at-pupman-dot-com
> > writes:
> >
> >
> > >
> > > Hello all,
> > >
> > >     This is Nolan I have been working on a new bi-polar tesla coil.  I
> use
> > > Ed Sonermans tesla coil spread sheet to calculate where to tune the
> primary
> > > coil.  I read before to tune a bipolar telsa coil to cut the
inductance
> of
> > > the secondary coil in 1/2 to maintain tune with the same tank
capacitor
> and
> > > that will give you the correct place to tap the primary coil. Would
the
> > > capacitance change since there will be one on each coil or will it
still
> be
> > > the same, I need to know what parameters to put in the spread sheet to
> > > figure where to tap the primary coil. Ok I have 2 new toroids each
> measures
> > > 21" outer diameter and 4.5" in the cross section for total capacitance
> of
> > > 22.75pf.  When the tesla coil is set up will the toroids be in series
> > > together cutting the capacitance in half to 11.375pf?  Or Will the
> toroids
> > > be in parallel doubling the capacitance to 25.5pf?  Or will it stay
the
> > > same? Do you have any other tips on using Ed Sonderman telsa coil
spread
> > > sheet to calculate for a bi-polar telsa coil. Thanks a bunch help is
> greatly
> > > appreciated!
> > >
> > > Sincerely,
> > > Nolan Moore
> >
> >
> >
> > Nolan,
> >
> > If you are building a coil that is mounted horizontaly, with a toroid on
> each
> > end and the primary in the center, then we have one primary coil and one
> > primary capacitor - correct?  You would enter the dimensions for one
half
> of
> > the secondary along with the capacitance for just one toroid.  The
> spreadsheet
> > is easy to find different component values once you get used to it.  I
> input
> > the secondary coil and toroid capacitance info.  Then the primary
> information
> > (using all turns of the primary i.e. 14 for a 14 turn primary), and
check
> what
> > the required primary capacitance would be.  It might come out to .0169
ufd
> for
> > instance.  You know that you need a capacitor at least this large, with
> the
> > primary tapped out at the last turn, allowing no room for tuning.  Then
> you go
> > back to the primary input information and change it to say a 10 turn
> primary.
> > Now it will show that a larger capacitor is required, say .0192 ufd.  So
> you
> > would select ! a capacitor that falls in that range.
> >
> > Ed Sonderman
> >
> >
> >
>
>
>
>