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Re: [TCML] Spark gap assembly, acrylic?? and toroid size
Hey John...
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
http://members.cox.net/bunnikillr/sprk.htm
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
( Hi-Density-Poly-Eurathane).
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...
Scot D
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?
http://www.kronjaeger.com/hv-old/misc/scotsgap/index.html
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
secondary.
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.
Thanks
John Matok
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