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Re: First Light for 10" Coil.
Original poster: tesla <tesla-at-paradise-dot-net.nz>
Hi Ben
I see Peter has explained the wiring of the MOT's . This is the normal
method that most use. There are some sche,es using multiple MOT's to improve
isolation but I've not experienced any problems with secondary to core
breakdown. I personally earth the core to put a barrier between the mains
and the HV side, I believe some float the core.
Thanks to Peter for description of ballst system
Rgds
Ted L in NZ
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, December 25, 2003 6:00 AM
Subject: Re: First Light for 10" Coil.
> Original poster: Ben Haylett <bhaylett-at-shaw.ca>
>
> Congratulations on an impressive looking coil, Peter.
>
> How do you (and presumably Ted as well) have your 6 MOTs configured? In
> other words, what sort of series/parallel arrangement are you using, and
> what would the output voltage be?
>
> Ben
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Tuesday, December 23, 2003 10:46 PM
> Subject: Re: First Light for 10" Coil.
>
>
> > Original poster: tesla <tesla-at-paradise-dot-net.nz>
> >
> > Greetings Peter
> >
> > A most interesting coil and quite similar to my own
> >
> > Very interested in the way you have done things
> >
> > The differences
> > Mine has 90nF of the 1600v 0.33uF caps (like Robin Copini)
> > SRSG is currently 300bps and all electrodes are near the 90deg and
270deg
> > points. This needs fixing, How did you decide on the location for your
> > rotating electrodes to set timing
> >
> > I use PFC of over 100uF and up to 6 MOT's. The MOTs I have are in oil
and
> > phased about ground. I use 900watt xfrmrs. I run fixed ballasting of
> 22mHy.
> > I was intrigued by your ballast and would be interested in the short
form
> > specs on that.
> >
> > I have just purchased the bits to put a dedicated outlet at the house
so
> > should be able to run the thing flat out.
> >
> > My operating freq, toroids and so forth are pretty similar, I can maker
> the
> > beast do 2 metre O/P but I know it will do better when I get SRSG
timing
> > better and a dedicated mains. It will run > than 40amps if I let it so
> need
> > to keep it at that level or things start to go wrong, like fuses start
to
> > blow.
> >
> > Hope to hear more from your expts
> >
> > Rgds
> > Ted L in NZ
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Wednesday, December 24, 2003 8:54 AM
> > Subject: First Light for 10" Coil.
> >
> >
> > > Original poster: "Peter Reid" <peter-at-reidconsulting-dot-com.au>
> > >
> > > Hello Everyone on the Tesla Coil Mailing List.
> > >
> > > I have just finished building my new MOT powered 10" Coil and
managed
> to
> > > tune it somewhat. I am quite happy with the results so far, however
I
> am
> > > wondering if anybody could shed some light onto areas I should work
on
> In
> > > order to improve the spark length and power handling capabilities of
> this
> > > coil. So far I have managed occasional 8.5ft Power Arcs to a
grounded
> rod.
> > > However I feel that the coil is still capable of a lot more.
Initially
> the
> > > spark output was quite poor until I increased the coupling between
the
> > > primary and secondary. (I don't think I've gone too far).
> > >
> > > I will list the specifications below. With the current setup I am
> getting
> > > quite powerful arcs to the strike rail and ground with-in about a
3ft
> > > radius around the coil.
> > >
> > > I have posted some photos on my website for anyone that's
interested. I
> > > also have some pretty good video footage, but that isn't on the
> > > webpage.
> > >
<http://tesla.reidconsulting-dot-com.au/>http://tesla.reidconsulting-dot-com.au
> > > Any input / help with improving the current setup would be greatly
> > > appreciated, I am just a little worried about burning up my
secondary
> if I
> > > try and pump any more power though it.
> > >
> > >
> > >
> > > Coil Specs are as follows..
> > >
> > > Primary
> > > Flat Spiral, Wound with ½ In Copper tubing, spaced but ½ inch.
> > > ID = 12.7in
> > > OD = 32.5in
> > > Turns = 10.25, tapped at about turn 6.15
> > > Primary sits 1.5ft above the ground on a specially made wooden
> platform.
> > > Strike Rail = 1/2copper tube raised by ½ inch around outside of
> primary.
> > >
> > > Secondary
> > > Wound on a 10" PVC pipe, which has been baked and sealed with many
> coats
> > of
> > > polyurethane.
> > > Winding length = 41in
> > > Wire Diameter = 0.9mm B&S Gauge 19
> > > The bottom turn of the secondary is elevated 1 inch above the top of
> the
> > > primary winding.
> > >
> > > Toroid
> > > 12" x 42.5" (Tube Diameter x Outside Diameter of Toroid)
> > > Mounted 12in above the top winding on the secondary.
> > >
> > > Measured Res Frequency of Secondary is 84.8kHz, and primary has been
> tuned
> > > to exactly that. (Can someone please tell me if its worth trying to
> detune
> > > it by 1/3 of a turn to account for streamer loading etc?.)
> > >
> > > Capacitor
> > > 0.15uF MMC Cap Bank made up of 144, 942C20P15K caps.
> > >
> > > Power Supply
> > > 6 MOT Supply, Currently Ballasted to 40A -at- 240V (Using
a
> > > Sliding Choke Balast)
> > > Maximum line draw current of 80A -at- 220v when the
ballast
> is
> > > removed. That's 17.6kVA J
> > > Approx 12kV output.
> > >
> > > Spark Gap.
> > > 200bps Sync Gap, with a Remote Phase Adjuster.
> > > Single Gap, Tungsten static electrodes, and 4 x 8mm
brass
> > > threaded rod (moving electrodes) Spinning on a 12in
> > > G-10 disc (3000 rpm) Gap spacing is about 1-2mm total.
> > >
> > >
> > > BTW, Thanks to everybody who has contributed to the mailing list,
the
> help
> > > I have received from you guys has been invaluable.
> > >
> > >
> > > Regards
> > >
> > > Peter Reid.
> > >
> > >
> > >
> >
> >
>
>
>