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Re: DRSSTC Magnifier Mark 1

Original poster: Steve Ward <steve.ward@xxxxxxxxx>


Thats an excellent tip about the 1:2 ratio for driver to resonator
inductance.  A quick calc in JavaTC says ive got a ~1:3.2 ratio at the
moment, with 7.4mH to 23.7mH.  Maybe i will try some other driver
coils, something more in the 11-12mH range.  Im imagining that the
voltage on the driver coil will be quite a bit higher, thus making
insulation problems worse, but maybe the higher voltage outweighs the
loss in coupling possible.

I redesigned my primary just a little.  The original primary is
constructed around a 3" length of 6" PVC.  I replaced the short 3"
length with an 8" long piece.  This allows the primary to slide up and
down to get greater coupling, and somewhat keeps it from arcing
between the coil.  And since im still using the same primary winding,
when i want to revert to a 2-coil system, i just slide the thing down!

I got the maggy up to 40" measured strikes!  Interestingly, the IGBTs
are running cooler, but the primary hotter!  The driver coil also gets
pretty warm.  This thing looks like a miniature version of Ed Wingates
popular magnifier ;-).  I will have to snap some pics when it gets
dark so that they turn out better than the last bunch.

Steve W

On 4/16/05, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "colin heath" <colin.heath4@xxxxxxxxxxxx>
> hi steve,
>             website doesnt work for me although 4hv isnt working at all for
> me. on the note of magnifier reading i learned that to get maximum energy
> transfer go for a 2/1 ratio between driver and extra coil so if extra 50mH
> then driver secondary 25mH. this seems to be what all the really successful
> maginifiers have in common.
> also with the solid state version this massive problem of quenching a
> tightly coupled sytems gap goes away also and this seemed to be one of the
> biggest challenges in magnifier design
> cheers
> colin
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Saturday, April 16, 2005 6:47 PM
> Subject: Re: DRSSTC Magnifier Mark 1
> >Original poster: Steve Ward <steve.ward@xxxxxxxxx>
> >
> >Hi Colin,
> >
> >The feedback is still primary feedback, thats the only way i could see
> >it working and being stable.  I remember trying simulations of using
> >feedback on the ground of the secondary coil but it wouldnt lock to
> >the right frequency... though this was awhile ago and ive learned so
> >many things that the sim might have been "flawed".
> >
> >Is my website not working for people?  Still works here, if not a bit
> >slow.  Maybe i need to go complain to my host :-).
> >
> >Steve
> >
> >On 4/16/05, Tesla list <tesla@xxxxxxxxxx> wrote:
> > > Original poster: "colin heath" <colin.heath4@xxxxxxxxxxxx>
> > >
> > > steve,
> > >         doh! i was talking about this on the tcbouk list a couple of >
> > months
> > > back but as usual talking about it is as far as i got.
> > > congrats on getting it working. what feedback did you use?
> > > im interested wether base current feedback would work as all the current
> > > has to flow through here right?
> > > although im sure if i remember correct (as website down)
> > > you use primary current feedback correct?
> > > well done on yet another breakthrough
> > > cheers
> > > colin heath
> >
> >