Yes, the volt-age is too low, and the uF-age is too high for any TC
application that I can think of, although the 10,000HZ 2000ARMS is
intriguing!
BTW, in the future, please start a new subject/thread if your post has
nothing to do with the parent post.
Regards, Gary Lau
TCML co-moderator
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On Thu, Nov 9, 2017 at 9:45 AM, Steve White <steve.white1@xxxxxxxxx> wrote:
> They look like PFC capacitors to me. No good for TC use.
>
> ----- Original Message -----
> From: "Rafal Pisula via Tesla" <tesla@xxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Thursday, November 9, 2017 3:47:28 AM
> Subject: Re: [TCML] First coil
>
> Hi folks,
>
> My first post - I just saw these caps listed on industrial auction site -
> not sure if of any use here, but just in case they are:
>
> http://www.go-dove.com/en/auction/view?id=12580057
>
> If anyone is interested, but is hesitant due to collection reasons etc -
> let me know, (PM me) as I can bid / collect on your behalf etc as I am
> interested in other items there, plus not too far for me
>
> Cheers
>
> Rafal
>
>
> On 30 October 2017 at 01:16, Terry Oxandale <toxandale@xxxxxxxxxxxxx>
> wrote:
>
> > Hi Gary,
> > I'm using a 6" x 30" secondary with an 8" x 34" toroid (plans are to use
> > this with a larger coil in the future, and these are very expensive so I
> > chose a single purchase of the larger between the two sizes considered).
> > 10Kva pig that is current and voltage adjustable, flat primary with
> .045uF
> > caps using an asynchronous rotary spark gap.
> > Per Bert's input (thanks Bert), tuning with the barb has been
> > accomplished, which brings me to a question about increasing bang size:
> Can
> > bang size also be increased by decreasing the rpms of the spark gap, by
> > allowing a larger charge to take place (using 8-point RSG on a variable
> DC
> > motor)? Interesting thought on the decreased barb length. The current one
> > is 1" long, I may go for 1/2" or perhaps 1/4" to see about increasing the
> > breakout voltage.
> > Anyway, I do have a smaller toroid I'll try (5" by 30" - a large
> > cast-aluminum corona ring with an aluminum plate welded in the middle, so
> > yes, it is odd, but it appeared to be effective) to get some perspective
> on
> > that.
> > Cheers,
> > Terry
> >
> > From: Gary Lau <glau1024@xxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Sunday, October 29, 2017 1:52 PM
> > Subject: Re: [TCML] First coil
> >
> > Hi Terry,
> >
> > I'm thinking that if the toroid size is too big, it won't break out
> without
> > the barb. Perhaps a few more details of your coil will make for a
> clearer
> > picture. Power source, gap details, cap size, and most importantly,
> toroid
> > size? With toroids, bigger is usually better, at least as far as getting
> > the longest possible streamer from a breakout point, but if you're
> shooting
> > for sparks without a breakout point, a smaller toroid may be necessary.
> >
> > Regards, Gary Lau
> > MA, USA
> >
> > <http://www.avg.com/email-signature?utm_medium=email&;
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> > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> >
> > On Sun, Oct 29, 2017 at 12:25 AM, Bert Hickman <
> bert@xxxxxxxxxxxxxxxxxxxxx
> > >
> > wrote:
> >
> > > Hi Terry,
> > >
> > > Racing sparks typically occur when energy is being injected into the
> > > secondary too quickly. Although this is _usually_ caused by
> > > excessively-high coupling, it can also occur when the bang size is too
> > > large for the size of your secondary, or if your system is
> significantly
> > > out of tune. To solve the problem(s), you'll need to first insure that
> > your
> > > system is in tune, that P:S coupling is not excessive, and that your
> > toroid
> > > is appropriately sized for your system's peak output voltage.
> > >
> > > 1. Tuning:
> > > I'd suggest initially running the system with a breakout point (or
> barb)
> > > during this phase. Reduce the primary spark gap length to reduce
> maximum
> > > bang size. Experiment with primary tap point until you get the maximum
> > > secondary spark length at a given variac setting. The system should be
> > > smooth running with consistent spark length under continued operation.
> > >
> > > 2. Coupling:
> > > If you don't see any racing sparks, slowly increase the "bang size" by
> > > widening the main gap slightly. Don't increase gap length beyond the
> > point
> > > where the safety gaps begins firing or if you start to see racing
> sparks.
> > > If you see racing sparks, reduce coupling slightly and continue the
> > process
> > > of increasing the main gap length until you can run at full power with
> no
> > > evidence of racing sparks. You may need to retune the primary a bit by
> > > increasing primary inductance slightly (i.e., moving the primary tap
> > > outwards 1/8 - 1/4 turn) to compensate for capacitive loading of longer
> > > secondary streamers. Any signs of racing sparks mean that you need to
> > > further decrease coupling.
> > >
> > > 3. Final tweaking:
> > > Reduce the length of the breakout point/bump to see if the coil can
> > > self-break from the toroid as you approach full power without
> introducing
> > > any racing sparks. Further decrease coupling if you see any evidence of
> > > racing sparks. Ideally, an appropriately-sized toroid will
> self-breakout
> > > before you reach full power. Failure to self-breakout can occur if the
> > > minor toroid diameter is too large (requiring excessively-high breakout
> > > voltage) or if the major toroid diameter (and capacitance) is too
> large,
> > > which reduces maximum topload voltage below the point of self-breakout.
> > For
> > > this case you may need to operate your system with a breakout bump or
> > point
> > > to insure breakout. Even with an optimal setup, you may still need to
> > use a
> > > breakout point during humid weather when it's significantly more
> > difficult
> > > to initiate breakout.
> > >
> > > Good luck,
> > >
> > > Bert
> > > --
> > > Bert Hickman
> > > Stoneridge Engineering LLC
> > > http://www.capturedlightning.com
> > > +1 630-964-2699
> > > ************************************************************
> ***********
> > > World's source for "Captured Lightning" Lichtenberg Figure sculptures,
> > > magnetically "shrunken" coins, and scarce/out of print technical books
> > > ************************************************************
> ***********
> > >
> > >
> > > Terry Oxandale wrote:
> > >
> > >>
> > >> It's been a long time since I was more active on this list. I never
> was
> > a
> > >> "technical" enthusiast, so being I've had the coil in storage for
> > probably
> > >> 10 years, and have forgotten more than I remember about coiling. I'd
> > like
> > >> to
> > >> tap the group for some help or advice please.
> > >>
> > >> My coil appears to operate as I remember it did, as long as I've got a
> > >> sharp
> > >> pointed barb sticking out the side of the toroid to promote a
> discharge.
> > >> When I remove the barb to get a normal toroial discharge, I get racing
> > >> sparks along the secondary, and nothing out of the toroid, all for the
> > >> same
> > >> power setting as the "barbed" setup (2kva). Thus I separated the
> > secondary
> > >> from the primary in terms of vertical distance to lower any excessive
> > >> coupling (shooting in the dark here), but still racing arcs along the
> > >> secondary.
> > >>
> > >> Any ideas on the huge difference (or lack of performance) between
> > "barbed"
> > >> and "non-barbed? No component changes have been made since a decade
> ago
> > >> when
> > >> it all worked great, and both configurations performing equally well.
> > >>
> > >> Terry
> > >>
> > >> _______________________________________________
> > >> Tesla mailing list
> > >> Tesla@xxxxxxxxxxxxxxxxxx
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> > >>
> > >>
> > >>
> > >>
> > >
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