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RE: dual mot tc (fwd)

To: tesla@xxxxxxxxxx
Subject: RE: dual mot tc (fwd)
From: "Tesla list" <tesla@xxxxxxxxxx>
Date: Mon, 8 Oct 2007 21:29:43 -0600 (MDT)
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Resent-date: Mon, 8 Oct 2007 21:29:44 -0600 (MDT)
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---------- Forwarded message ----------
Date: Mon, 8 Oct 2007 11:05:15 -0400
From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: dual mot tc (fwd)


Clive,
     Bottle caps should work fine with an NST, I used them with my OBIT
stack, which is similar to an NST in most respects.  If you are concerned
about voltage breakdown, remember that glass has a dielectric strength of
about 200-300 V/mill, so a piece of glass an eighth of an inch thick will
withstand about 25000 volts.  Most jars are a little thicker that that, so
you should be fine with any NST.  An NST is also better because of the
higher working voltage of the spark gap makes it easier to construct, and
you will have less problems with power arcing due to the lower current.  
If you have not already procured an NST, check out OBITs (oil burner
ignition transformer) as well, you may be able to get them for free from a
furnace repair place, they are generally less hardy, but if treated well,
they will due nicely (I've never lost an OBIT in TC service yet, excluding
the ones that were already damaged).  You may want to pick up a few, and
stack them for more current.  Good luck.

Scott Bogard.


> Date: Mon, 8 Oct 2007 07:51:03 -0600
> From: tesla@xxxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: dual mot tc (fwd)
> 
> 
> ---------- Forwarded message ----------
> Date: Sun, 7 Oct 2007 13:40:06 -0700
> From: Clive Hansen <mrclivehansen@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: dual mot tc (fwd)
> 
> I think I have decided to possibly steer away from the mots and instead use
> an nst because of the lower output current for safety. Does anyone see this
> causing problems with the previously mentioned capacitor setup?
> 
> On 10/7/07, Clive Hansen <mrclivehansen@xxxxxxxxx> wrote:
> >
> > Okay, from what I can gather several glass bottles filled with brine with
> > copper tubes inside them sitting a container filled with brine would
> > probably work the best for what I have access to. That is probably what I
> > will go with then.
> >
> > On 10/6/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> > >
> > >
> > > ---------- Forwarded message ----------
> > > Date: Sat, 6 Oct 2007 16:49:04 +1000
> > > From: A. Wang 2007 T476202 <tangara_02@xxxxxxxxxxx>
> > > To: Tesla list < tesla@xxxxxxxxxx>
> > > Subject: RE: dual mot tc (fwd)
> > >
> > >
> > > Sounds fine to me, though you might need a few for a decent tank
> > > capacitance value. That's something I need to try making meself. If you
> > > can, it is slightly more preferable to try to get a commercial pulse
> > > capacitor, MMC, or doorknobs. But otherwise bottle capacitors work
> > > better
> > > than some other commercial capacitors.
> > >
> > > Good luck with your coil,
> > >
> > > A.Wang 2007
> > > _____________________________________________________________
> > >
> > > "If you do nothing, nothing will go wrong"
> > >
> > > Bean- The Ultimate Disaster Movie
> > >
> > > > Date: Fri, 5 Oct 2007 11:17:38 -0600
> > > > From: tesla@xxxxxxxxxx
> > > > To: tesla@xxxxxxxxxx
> > > > Subject: Re: dual mot tc (fwd)
> > > >
> > > >
> > > > ---------- Forwarded message ----------
> > > > Date: Fri, 5 Oct 2007 07:37:05 -0700
> > > > From: Clive Hansen < mrclivehansen@xxxxxxxxx>
> > > > To: Tesla list <tesla@xxxxxxxxxx>
> > > > Subject: Re: dual mot tc (fwd)
> > > >
> > > > I think I will be using caps made from a 2 liter plastic bottle filled
> > > with
> > > > salt water with a copper pipe suspended in it and tin foil covering
> > > the
> > > > outside of the bottle. Does anyone think that this would work
> > > acceptably?
> > > >
> > > > On 10/4/07, Tesla list < tesla@xxxxxxxxxx> wrote:
> > > > >
> > > > >
> > > > > ---------- Forwarded message ----------
> > > > > Date: Fri, 5 Oct 2007 15:12:30 +1000
> > > > > From: A. Wang 2007 T476202 < tangara_02@xxxxxxxxxxx>
> > > > > To: Tesla list <tesla@xxxxxxxxxx>
> > > > > Subject: RE: dual mot tc (fwd)
> > > > >
> > > > >
> > > > > Don't even bother thinking about the MO caps. They have high losses
> > > at
> > > > > 500Hz-ish, let alone RF. If you can, get some tinfoil and projector
> > > > > slides, and you can build a plate capacitor. Otherwise, your plan is
> > > > > pretty much fine as i see it. I went with a MOT coil myself.
> > > > >
> > > > > A.Wang 2007
> > > > > _____________________________________________________________
> > > > >
> > > > > "If you do nothing, nothing will go wrong"
> > > > >
> > > > > Bean- The Ultimate Disaster Movie
> > > > >
> > > > > > Date: Thu, 4 Oct 2007 22:43:27 -0600
> > > > > > From: tesla@xxxxxxxxxx
> > > > > > To: tesla@xxxxxxxxxx
> > > > > > Subject: RE: dual mot tc (fwd)
> > > > > >
> > > > > >
> > > > > > ---------- Forwarded message ----------
> > > > > > Date: Fri, 5 Oct 2007 00:32:40 -0400
> > > > > > From: Scott Bogard < teslas-intern@xxxxxxxxxxx>
> > > > > > To: Tesla list <tesla@xxxxxxxxxx>
> > > > > > Subject: RE: dual mot tc (fwd)
> > > > > >
> > > > > >
> > > > > > Clive,
> > > > > >      A few suggestions, wire your MOTs in series/anti-parallel
> > > > > > configuration, this means have the two MOT cores wired together
> > > with a
> > > > > > ground (like a center tap grounded NST) and wire the primaries in
> > > > > > parallel.  If you cannot draw any arcs between the two HV outs,
> > > then
> > > > > > reverse polarity of only one of MOT primaries.  1/4 cu tubing is
> > > fine.
> > > > > > The advantage of this is that the MOTs are working at their
> > > ordinary
> > > > > > voltage ratings, and oil is not necessary (they also run quieter
> > > this
> > > > > way,
> > > > > > as their noise cancels each other out, kind of cool).  18AWG wire
> > > is
> > > > > kind
> > > > > > of big, unless you plan on building a big secondary, like 12-in
> > > > > diameter,
> > > > > > (I assume you plan on using 18 AWG "magnet wire" correct?).  Three
> > > > > segment
> > > > > > spark gap should be fine if designed properly, I cannot help you
> > > there,
> > > > > > never had good luck with multi-segment gaps, I went strait to a
> > > rotary
> > > > > > gap.  You cannot use MO caps for a tank cap, they will be terribly
> > >
> > > > > > inefficient, and I've read about them blowing up in TC use (you
> > > cannot
> > > > > > believe everything you read however, perhaps someone on the list
> > > can
> > > > > > verify or discredit this).  Your best bet would be a proper MMC
> > > with CD
> > > > > > caps, or if you are really strapped for funds (like me), you could
> > > build
> > > > > a
> > > > > > cap the old fashioned way, check the archives if you are
> > > interested.  I
> > > > > > hope this helps, good luck. Scott Bogard.
> > > > > >
> > > > > > > Date: Thu, 4 Oct 2007 20:39:01 -0600
> > > > > > > From: tesla@xxxxxxxxxx
> > > > > > > To: tesla@xxxxxxxxxx
> > > > > > > Subject: dual mot tc (fwd)
> > > > > > >
> > > > > > >
> > > > > > > ---------- Forwarded message ----------
> > > > > > > Date: Thu, 4 Oct 2007 17:13:47 -0700
> > > > > > > From: Clive Hansen <mrclivehansen@xxxxxxxxx>
> > > > > > > To: Tesla list <tesla@xxxxxxxxxx>
> > > > > > > Subject: dual mot tc
> > > > > > >
> > > > > > > Hello,
> > > > > > >      I am thinking of building a coil using two mots in series
> > > under
> > > > > oil
> > > > > > > with an inductive ballast to limit current. For a tank cap, I
> > > want to
> > > > > use
> > > > > > > two or three microwave oven caps in series. My spark gap will be
> > > a
> > > > > three
> > > > > > > segment gap quenched by a leaf blower. I want to use 1/4in
> > > copper
> > > > > piping for
> > > > > > > the primary and 18 gauge wire for the secondary. I must use
> > > microwave
> > > > > oven
> > > > > > > parts because they are very cheap. If anyone sees any problems
> > > with
> > > > > this
> > > > > > > setup please let me know.
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Clive
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > _________________________________________________________________
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> > > > > >
> > > > >
> > > > > _________________________________________________________________
> > > > > Live Earth '07 updates, artist info & concert streams!
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> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > > _________________________________________________________________
> > > Live Earth '07 updates, artist info & concert streams!
> > >
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> > >
> >
> 
> 

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