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Re: Spark gap not firing
Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Parpp807-at-aol-dot-com>
In a message dated 2/4/01 1:45:26 PM Central Standard Time, tesla-at-pupman-dot-com
<< Original poster: "Barton B. Anderson by way of Terry Fritz
Hi Bart, Michael, All,
Gentlemen, Gentlemen, please:
We have here a prime example of the frailties of ASCII...it sucks!
A simple diagram is all that is needed.
I refer my myself and all interested to page 5-4 of John Couture's,
Tesla Coil Construction Guide, and page 14 of Brent Turner's, Tesla Coil Book
which has the same schematic.
The capacitor is in parallel with the NST. One side of the capacitor goes to
the SG and to one side of the NST. The other side of the SG is connected to
one side of the primary. The other side of the primary returns to the common
side of the capacitor and the NST.
Again: One side of the NST is connected to the capacitor and one side of the
primary. The other side of the NST goes to the other side of the capacitor,
end of the SG. The other end of the SG goes to the other side of the primary.
Bart, perhaps you are referring to the safety gap which is shown in John
diagram. Perhaps Michael was referring to a safety gap, in which case I am
the one who is confused...a not-at-all infrequent happening. I have never used
a RSG. Is it connected any differently than a static SG?
> Hi Ralph, Michael, All,
>Tesla list wrote:
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> In a message dated 2/2/01 10:44:55 PM Central Standard Time,
> << I now have it wired in series with the primary coil, which is made
> from 1/4" refrigerator tubing and consits of 6 turns at 1/2" spacing with
> inner diameter. I have a calculated inductance of 10 - 11 microhenries I
> believe (dont recall the exact number) It is also wired in series with
> capacitor. The transf >>
> Hi Michael,
> It sounds here as if you have the coil wired wrong. connect the capacitor
> with the NST.
This is not right. The RSG should be in parallel with the NST. The cap should
be in series with the primary. It will work as you suggested, but you will
the transformer at risk. Having the cap parallel with the transformer will
cause the transformer to feel the full RF of each bang. By placing the RSG
parallel with the transformer, the RF seen at the transfomer is greatly
reduced. I beleive Greg L. stated the a reduction by a factor of 10:1.
As far as Michael's problem, it may possibly be on which side of the cap the
RSG is connected. If the RSG is connected between the primary and cap then he
will get nothing. The RSG should be connected between the cap and NST. (this
just a possibility).
> Then connect one side of the cap to one side of the primary.
> the other side of the capacitor goes to the SG, and the other side of the
> goes to the other side of the primary. Again: the cap is in parallel with
> NST, and the SG is in series with the primary.
> The 0.0056 uF calculation sounds about right and should give you something
> you connect things correctly. I would want to try something
> a little larger than 0.01uF. Since you built the cap are you sure you have
> Try to get a MMC as soon as you can. There is a lot of info in the Tesla
> archives and on the various Tesla links. Study the books by John Couture.
> Stay safe.
> Ralph Zekelman