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Re: Spark gap not firing
Original poster: "Matus-at-snet-dot-net by way of Terry Fritz <twftesla-at-uswest-dot-net>" <matus-at-snet-dot-net>
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
Sent: Saturday, February 03, 2001 12:22 PM
Subject: Re: Spark gap not firing
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> In a message dated 2/2/01 8:45:06 PM Pacific Standard Time,
> << I
> built a foil stack capacitor composed of five aluminum flashing plates
> were 5" x 7" sandwiched in between them was a rubberized adhesive
> which I do not know the exact K value for. The rubber adhesive was four
> across and covered the length of the aluminum plate, giving a capacitor
> 4" x 7". The rubber layers is about 1/64" of an inch across. >>
> I would say that your cap is shorting your NST out. You say that the
> plates are 5" x 7" but your rubber adhesive strip is only 4" wide, if I'm
> standing you correctly. The dielectric MUST must exceed all deminsions of
> the conductor plates or the HV will easily arc around the egdes of the
> tric or worse yet, the foil plates will lay on each other where they
> dielectric and completely short out the transformer.
I should have been more clear on that. The flashing that I bought was 5x7
but the rolled rubber adhesive was only 4x7. So I let one inch hang over
the edge on either side to equate one terminal of the cap. the different
plates were never directly over one another. Looked like this
The dialectric had a 1/4" over hang on the sides where the opposite plates
were close to one another, although that might not have been enough.
You need at least a 1"
> clearance of dielectric on all sides of the conductive plates, i.e.- 6" x
> tive plates need at least 8" x 8" dielectric plates between them.
> Also, you will definitely need a dielectirc thicker than 1/64" for a Tesla
> capacitor. And it will need to be oil-filled and vacuumed down or it will
> fail. In my opinion, if you can afford it, you need to buy some of Terry's
> sonic .056 uFD MMC caps and build your cap from that.
Where do I buy those?
I think this would
> save you a lot of headache in building your capacitor.
I think so as well, although I would like to get one to work so I at least
know how to do it! =)
I've successfully built
> homemade caps that would hold a charge and give a visible spark discharge,
> but I have never successfully built one that was suitable for Tesla
> Some people have, but most them had skills and facilities that are beyond
> the average hobbiest reach. And in the long run, it would probably be a
> cheaper for you to buy the MMCs than to buy the polyethylene sheets and
> alum. flashing and then it fail on you anyway :-(
> My $.02 worth,
> David Rieben