Re: [TCML] Hello again

[Karl Lindheimer <karl.lindheimer@xxxxxxxxx>]

Mark Dunn's web site can be found here: http://www.teslaboys.com/

Hope that helps

Karl

On Tue, Oct 20, 2009 at 9:34 PM, Paul Brodie <pbbrodie@xxxxxxxxxxxxx> wrote:

> I checked and it was Mark Dunn who was using the 4 MOT transformers to
> power his coil, using DC resonant charging. He used to have a fabulous web
> site documenting all of the work he put into developing his MOT power supply
> and his Tesla Coils. I feel sure that he can answer all of your questions,
> if he is still active and if you can still access his web site. I can't seem
> to locate it. When I Google, I get all sorts of hits for some author of the
> same name but nothing for the Mark Dunn I am looking for. Does anyone know
> anything about Mark and whether or not he is still active? It has been about
> 3 or 4 years since I had to stop my activities and I lost contact with
> everyone.
>
> I do remember that he had 2 MOT's on each side of center ground, with the
> primaries wired anti-series and the secondaries in series. He had his
> submerged in oil in a plastic container, IIRC. Hope this helps and you can
> locate Mark.
> Paul,
> Think Positive
>
> ----- Original Message ----- From: Aric R
> To: tesla@xxxxxxxxxx
> Sent: Tuesday, October 20, 2009 12:11
> Subject: [TCML] Hello again
>
>
>
> I've been an on again off again member of the Tesla list for over a decade.
> Just want to say hello to my friends old and new, and ask a question.
>
> I'm constructing a pair of transformer assemblies, each consisting of two
> microwave oven transformers with the primaries wired together anti-series,
> and the secondaries in series, thus allowing for about 4200VAC out of each
> unit, for 240VAC in.  One leg from each MOT secondary is grounded to the
> MOT
> chassis, and both MOTs in each assembly are bolted to an aluminum plate,
> such that the plate floats like a center tap for the secondaries.  The
> plate
> is electrically isolated from the housing, a .223 ammo can, using nylon
> spacers which clamp around the Al plate.  My intention is to immerse the
> transformers in oil, Vaseline, or wax, as one of the transformers in each
> assembly will be subjected to twice their designed dielectric stress when
> the lumped secondaries of each assembly are wired in series, and I'd also
> like to entertain the possibility of adding two more such modules to the
> series chain in the future.
>
> I wanted to know if anyone has constructed a similar device, using
> ammunition canisters.  They are equipped with substantial-looking seals,
> but
> I don't know if they are oil-proof.  It would make sense that they should
> be, as oil is often used to deactivate ammunition, but I'd like to learn
> for
> another's experience if this has been attempted.  Also, I'd like opinions
> on
> whether canning wax would be sufficient in this application, as I'd just as
> soon not have to deal with leaking transformer oil.
>
> I've hi-pot tested one of the assemblies, and in air, the floating Al plate
> shorts to the grounded ammo can at around 7KV.  This is before deburring
> the
> edges of the plate, and rounding the corners (the discharge point was
> always
> the same plate corner).
>
> Electrical connections will be realized through the use of ceramic
> feedthrough insulators for the secondary terminals, and homemade plastic
> feedthrough insulators for the primary.
>
> Aric Rothman
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla