Re: [TCML] Spark gap assembly, acrylic?? and toroid size

["John Matok" <jmatoknoon@xxxxxxxxx>]

Scot,

You said that Lexan is good for low temperature applications, but is it
suitable to use in a spark gap?  On the website that I provided, the plans
said to use Lexan.  How hot can the Lexan get if it's not in direct contact
with the copper?  How hot do spark gaps get in general?

Nicholas Goble


On Wed, Jul 16, 2008 at 7:56 AM, bunnykiller <bunnikillr@xxxxxxx> wrote:

> 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
>
>
>
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