Re: PlasmaSonic SSTC II

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

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
 > > >
 > > >
 > > >
 >
 >
 >