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Re: Terry's DRSSTC - First light ;-))

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>

I presume you are using some type of grounded strike rail?

We make up 3 stands that terminate on top with a 1/2 dia metal cabinet knob.
The stands have a 5 x 5 inch x 1/4 inch thick base.  Each vertical brass rod
is adjustable from 12 inches up to 3 ft.

The three are joined together with standard "bananna" plugs and receptacles
for fast setup.

We place them 3-4" away from the edge of the upper base support --- just
outside of the primary.  We made the vertical brass piece adjustable with a
small hose clamp.  This allows vertical adjustment for different coils such
that the small terminal ball is approx 3-4 inches above the primary coil and
3-4" outside of it.  In essence, a portable strike rail!

It's very easy to set up and makes the mounting of a fixed ring on the pri a
thing of the past.  Allows placement around different coils as you build
different designs.

The main ground is attached to the main ref ground --- same one as the
bottom of the sec coil.

Dr. Resonance

> > >Could a DC blocking capacitor be added in series with the ground connection > >to the tesla coil secondary? In the event of a strike to the primary the DC > >bus caps cannot then discharge through the IGBT into the ground via the > >secondary. Just an idea, maybe there is greater problems than this to worry > >about or this just adds further problems. > > > >Cheers, > > > >Paul. > > > I have been thinking real hard on this %:-) > > I blew two more IGBTs Sunday when a streamer either hit the primary again > or the DRSSTCs case at 41 inches!!! They guy closest said it hit the case > where others though the primary got hit (no cam this time). Happily, it > just blows pairs of IGBTs which is not bad to fix at all! > > A DC block all by itself still lets bad RF through, but simply adding an > inductor forms a bandpass filter that may indeed do the trick!! I wrote up > the details here: > > http://drsstc.com/~terrell/notes/DRSSTCprotec.pdf > > Thanks for the starting idea!! > > Cheers, > > Terry > > >