[TCML] Spark gap assembly, acrylic?? and toroid size
bunnikillr at cox.net
Wed Jul 16 05:56:58 MDT 2008
I havent built the spark gap as shown with the aluminum holders but I
did build the one without the aluminum... I had it running on a coil
that was powered by 4 15/30 NST's in paralell and it worked quite well.
Eventually tho, I had to clean the surfaces of the tubes due to
oxidation etc. I found that adding a small fan to the unit increased its
quenching too... see link below for pictures
As far as plastics, obtain a cutting board ( white plastic 1/4"+
thickness) from places like Wal Mart etc. Usually they are made of HDPE
acrylic,polycarbonate,lexan,plexiglass are ok for low temp applications
but can be either brittle or "gummy" when machined ( altho Lexan is
great at low speeds and cuts nice) normally clear in color
Perfboard isnt really a plastic its more of a laminate/epoxy combo
MMC's are good on either HDPE, perfboard or G-10
Sparkgaps work best with G-10 due to the heat produced
Primary coil, once again HDPE
Toriod size "normally" is about the same over dia = to length of
secondary and smaller dia =to a bit less than secondary dia.
example, you have a 20X4.5 toroid would be good at 18-20 X 3-4
a second primary on a different power supply... ummm I would say no. a
bi level primary on a single supply would work... someone on the list
has done so but I dont remember who did it... I dont know if it
increased output tho, seems to me it wouldnt..
A magnifier is a "2 coil system", it has a very tight coupling
coeficient on the 1st primary/secondary coil which drives a second
secondary and toroid. Special design considerations must be made to get
this type of system to work properly. Antonio has some great literature
on this type of coil...
John Matok wrote:
>I'm nearing the end of construction (for now) and I have 4 questions.
>1) Has anyone tried to build the spark gap described on this page?
>How do you think it will work? It looks fun to build.
>2) I know I'm not supposed to mount stuff (MMC, spark gap, primary coil) on
>wood because it contains moisture (right?). So I've been told that I should
>use many different plastics such as perf board, HDPE, Lexan, PVC, plain old
>cutting board, acrylic, polycarbonate, and polypropylene. That's all a
>little overwhelming! Is there a difference, what should I use, and where
>can I find it?
>3) This has probably been discussed before, but I can't find any thing
>definitive. How big should my toroid be? I'm planning on using aluminum
>ducting and pie pans. I've got a 9/30 NST and a 20" tall 4.5" diameter
>4) Is it possible to add another primary under an already existing one and
>attach it to a different primary circuit? Would that double the output?
>Maybe I'm describing a magnifier. I'm not sure.
>Tesla mailing list
>Tesla at www.pupman.com
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