Re: Three coils DRSSTC

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

Original poster: "Liviu Vasiliu" <teslina-at-yahoo-dot-com> 

Hi Malcolm
I thought that this configuration would work in a
disruptive system too, though I think that the results
looks better for SSTCs types.
  I realise that the classic DRSSTC is better. This
approach was proposed as an alternative for the no
bricks people..))

teslina
 >
 >
--- Tesla list <tesla-at-pupman-dot-com> wrote:

 > Original poster: "Malcolm Watts"
 > <m.j.watts-at-massey.ac.nz>
 >
 > Hi Liviu,
 >             My second working Tesla coil was built
 > exactly like the
 > one described below (except that it was disruptive).
 > The extra tank
 > circuit was built on a cardboard former the same
 > diameter as the
 > single turn primary, Tesla-style and was tuned using
 > a ceramic
 > transmitter cap (which succumbed to the stress after
 > several years).
 > The reason I did it was to get around the abysmal Q
 > of the primary
 > which was pegged by the secondary design which
 > obviously couldn't be
 > altered. The scheme worked very well but the overall
 > result was still
 > pathetic compared with the later results I got from
 > the same
 > transformer and a half-decent coil design (5 feet as
 > opposed to 20 or
 > so inches).
 >       According to the CSN, Tesla spent some time
 > investigating this
 > configuration. My take on its operation with regard
 > to my coil at the
 > time was that it boosted k between the primary and
 > secondary
 > considerably. That may not have been the whole story
 > since the
 > configuration is roughly equivalent to a standard
 > magnifier and
 > therefore had more resonance modes present.
 >
 > Malcolm
 >
 > On 27 Sep 2004, at 11:13, Tesla list wrote:
 >
 >  > Original poster: "Liviu Vasiliu"
 > <teslina-at-yahoo-dot-com>
 >  >
 >  > Hi
 >  > Sometime ago, on tesla list, we discussed about
 > some
 >  > special HV transformers with 3 windings (primary,
 >  > secondary and a third coil which forms a resonant
 >  > circuit with a cap connected to its ends). This
 > made
 >  > me think if this approach would not be usefull in
 > a
 >  > dual resonant coil. The benefits would be:
 >  >
 >  > - free ringing at low resistence in the resonant
 >  > circuit, feeding the streamer with more energy,
 > after
 >  > the primary (driven by an interrupted SSTC) stops
 >  > conducting.
 >  >
 >  > - overcurrent protection for the bridge
 > components,
 >  > which would not be stressed by the high currents
 >  > circulating in the resonant winding.
 >  >
 >  > So, I built a messy prototype TC which gave some
 > good
 >  > results ( +40% spark lenght increase with the
 > resonant
 >  > coil versus simply interrupted SSTC).
 >  >
 >  > The schematics and pics are here:
 >  >
 >  > http://www.geocities-dot-com/teslina/3cdrsstc.html
 >  >
 >  > The project was a result of the "necessity"
 > because
 >  > the high current IGBTs dont live on this land..
 >  > Maibe this approach is a way to go..
 >  >
 >  > teslina
 >  >
 >  >
 >  >