Maybe a shot in the dark, but have you tried running near the 'center' of
the primary? I am just wondering about harmonics.. But could be out of my
league here :)
On Aug 31, 2016 5:24 PM, "Adam Merchant" <megavolttx@xxxxxxxxx> wrote:
> Thanks to you guys that have checked out my post & photos.... Gary, Brian,
> Matthew, and Deano. I appreciate it. Brian you are absolutely right! It's
> very exhilarating to have success after all the planning and construction
> of this project.
>
> Question- On my 15 turn primary coil, I'm tapped to the maximum of
> the length of the coil. Would it be worth a try to remove some turns from
> my secondary coil (de-tune?) to achieve a better output. Assuming this
> would hopefully achieve a closer match in resonance....
> I have shortened the secondary coil from 23" to 20" now and haven't
> observed a noticeable difference, but it seems that most of the other
> coilers have their primary tapped somewhere closer towards the middle. The
> end just seems to be the best place to tap. I just don't want to keep
> shortening my secondary if it's not changing much.
> Thanks again!
> - Adam
>
> Here is some video of some of my first runs.... Hope u enjoy
>
> https://youtu.be/W04DvEe8c5k
>
> https://youtu.be/ke4lWN4o2xY
> Sent from my iPhone
>
> > On Aug 28, 2016, at 7:35 PM, Brian Hall <brianh4242@xxxxxxxxxxx> wrote:
> >
> > This brings up a general question I have, given what I've read here over
> the years on this list vs. what I have learned about LC resonance in a
> recent college circuit theory class.
> >
> > If the resonant frequency F = 1/(2pi(sqrt(LC))) then why does the
> capacitance of the primary circuit need to be matched to the transformer?
> >
> >
> > Or is it that the primary capacitor has two attributes: voltage and
> capacitance. The capacitor voltage needs to handle what the transformer
> voltage can deliver, (or 1.5 to 2x the transformer max out volts) and the
> primary coil L and primary capacitance C need inductive and capacitivie
> values such that F = 1/(2pi(sqrt(LC))) holds true, and match with the
> same resonant frequency F of the secondary LC circuit? Is that all we
> need to change when we swap out a transformer in the primary circuit, just
> the voltage max on the capacitor?
> >
> > And Adam, yes I too would like to see a link to the video of your coil,
> always fun to demonstrate your first one! So satisfying to see those
> sparks fly.
> > ----------------------------------
> > Brian Hall
> >
> >
> >
> > ________________________________
> > From: Tesla <tesla-bounces@xxxxxxxxxx> on behalf of Jonathan Peakall <
> jpeakall@xxxxxxxxxxxx>
> > Sent: Sunday, August 28, 2016 11:15 AM
> > To: Tesla Coil Mailing List
> > Subject: Re: [TCML] Show and tell first SGTC
> >
> > Adam, Not too surprising that you saw little improvement. The extra
> > voltage isn't as helpful as more current would be. Try getting a match
> > to any of the transformers you have and run them in parallel. You need
> > to phase the outputs, plenty of info about that out there. Then of
> > course you will need to change your tank cap value.
> >
> > Hope you have a safety gap set low enough that it dings your
> > performance. And if you don't have a Terry filter I would recommend
> > making one. NST's are pretty easy to fry.
> >
> > Jonathan
> >
> >
> >> My name is Adam. I'm elated to be a new member. I was really captivated
> by the Tesla Coil by the you tube community and researching Nikola Tesla
> sparked my interest even more.
> >> Around the beginning of 2016 I decided to try and build my own spark
> gap tesla coil. Before summer in May; I finally had success!!
> >> Powered by a Transco 12,000 volt 30 mA NST into a homemade terry filter
> minus the MOVs. A tungsten rod static gap quenched with a vacuum pump and
> ceramic magnets. A homemade MMC; one string on Cornell Dubilier 942....-K
> connected in series. Primary coil is 1/4" soft copper tubing starting 5 &
> 1/2" inner diameter in a conical rise of 15-20 degrees approximately....
> 50' of copper 15 turns tapped at the very end of the inner and outer turns.
> My secondary is a 4" PVC pipe 22" tall and the windings take 20" of the
> pipe. I used 28 AWG magnet wire and for a toroid I used the housing out of
> a ceiling fan which I sanded free of paint. It's about 14" in diameter and
> about 2 & 1/2" tall. It works well, but gets a lot of streamers due to the
> edge facing the bottom.
> >> I've recently swapped to a 15,000 volt 30 mA NST. France brand.
> Also added 3 more caps to my MMC for a new total of 18 in series. It has
> improved slightly from the 12kV NST, but only slightly. I will soon have
> another 15kV 30 mA NST; Transco brand. I anticipate a big improvement in
> output.... Anyway, just wanted to share with the community and ask for
> anybody willing to share thoughts/tips/advice etc... Any constructive
> criticism is welcome and I appreciate all feedback. Trust that I will take
> it in with an open mind. Here are some pics and video... Hope u enjoy:
> >>
> >>
> >>
> >>
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