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

["Tesla list" <tesla@xxxxxxxxxx>]

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
>
>
>