Re: PlasmaSonic SSTC II

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

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

Hi Malcolm,

I always use a breakout for higher powers.  I did do some tests with a low 
coupled primary and no breakout point, and they were successful, yet sparks 
were short since i needed the low coupling to prevent flashover.  But, when 
using large toroids and even a large breakout point, i would get flashing 
between the coils due to the very high couplings i use (about .5 usually).
Im my opinion the toroid will usually look small compared to the secondary.
And yes, very tall coils could perhaps use larger toroids without breakout 
points (perhaps i will experiment with this as well ;D ).  Its times like 
this when i wish i had a large collection of secondary coils (though i do 
have quite a few!)

Steve


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: PlasmaSonic SSTC II
>Date: Wed, 01 Oct 2003 08:14:43 -0600
>
>Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz>
>
>Hi Steve,
>
>On 30 Sep 2003, at 20:52, Tesla list wrote:
>
> > Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
> >
> >
> > Note that SSTCs often use SMALL toroids!!!  Whenever i tried a large SGTC
> > toroid, my SSTC driver did not like it at all!!  And, the larger toroids
> > seem to promote flashover between a tightly coupled primary and secondary.
> > I like to use small toroids using 1.5" diameter tubing and diameters
> > ranging from 6"od to 12"od.  I know dan uses slightly larger toroids,but
> > his secondary coils are also much taller than mine.  Just something to keep
> > in mind!
>
>Is that with or without a breakout point? If a larger terminal is
>used and causes the breakout voltage to elevate to the point where a
>flashover occurs it may be time to think about building a taller
>coil.
>
>?
>Malcolm
>
> > Steve Ward
> >
> > >From: "Tesla list" <tesla-at-pupman-dot-com>
> > >To: tesla-at-pupman-dot-com
> > >Subject: Re: PlasmaSonic SSTC II
> > >Date: Tue, 30 Sep 2003 13:02:59 -0600
> > >
> > >Original poster: dhmccauley-at-spacecatlighting-dot-com
> > >
> > >
> > >You'll need a different primary winding.  Spark gap tesla coils 
> utilize very
> > >loosely coupled primary coils.  SSTC coils on the other hand require very
> > >tight coupling.
> > >The secondary and toroid can remain.  All you need to do is get a slightly
> > >larger diameter PVC pipe, put about 12-15 turns (no tuning required) 
> around
> > >this pipe, and slide over your
> > >exisitng secondary.  Thats it!
> > >
> > >For voltage, if you are planning on running half-rectified (no audio
> > >modulation), then 240VAC should work great and that is what i'm specifying
> > >the maximum "tested" limit on the boards.
> > >You can try other voltages, but other voltages have not been verified 
> by me.
> > >That doesn't say they won't work though.
> > >
> > >For audio modulation, i would specify 140VAC tops for input to your
> > >bridge-rectifier filtered DC supply.  This will yield about 170-200VDC
> > >depending on your input voltage.
> > >
> > >Dan
> > >
> > >
> > > > I just ordered one of these boards and I'm looking foward to 
> experimenting
> > > > with it.
> > > >
> > > > Can we run the SSTC circuit board with an existing spark gap tesla 
> coil,
> > >or
> > > > does it need a differnent primary winding.  I was thinking of
> > >disconnecting
> > > > the primary capacitor, filter, power source and connecting the driver
> > >board
> > > > up to the primary copper tubing spiral.  This would make things so 
> easy.
> > >Is
> > > > it this simple??
> > > >
> > > > The other thought I had was to get more voltage to the board.  I have a
> > >120
> > > > volt isolation transfomer, actually it will do 120V to 140V.  If I 
> connect
> > > > the one secondary lead to the neutral power wire and take the 
> output off
> > >the
> > > > hot power wire and the other secondary connection, I will get 220 
> to 250
> > > > volts(assuming I get the phasing right).  Then I connect this to a 
> variac
> > >to
> > > > control the voltage.
> > > >
> > > > Has anyone tried these ideas before?
> > > >
> > > > thanks,
> > > >
> > > > Shaun Epp
> > > >
> > > >
> > > >
> >
> >