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Re: dual mot tc (fwd)

To: tesla@xxxxxxxxxx
Subject: Re: dual mot tc (fwd)
From: "Tesla list" <tesla@xxxxxxxxxx>
Date: Tue, 9 Oct 2007 06:47:37 -0600 (MDT)
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Resent-date: Tue, 9 Oct 2007 06:47:37 -0600 (MDT)
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---------- Forwarded message ----------
Date: Tue, 9 Oct 2007 00:20:43 -0500
From: Joshua Johnson <jjohnson98@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: dual mot tc (fwd)

This site has a calculator for bottle caps near the bottom of the page.
http://www.classictesla.com/java/calculat.html
I have a sneaky suspicion if you use an NST it will be a 15kV 30mA and then
you'll want about 7.4nF for an LTR cap. 5nF puts you pretty close to
resonance for that transformer type and could cause NST failure.
Good explanation of LTR:
http://www.pupman.com/listarchives/2001/January/msg00096.html

Good luck,
Josh

On 10/8/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>
>
> ---------- Forwarded message ----------
> Date: Mon, 8 Oct 2007 20:55:51 -0700
> From: Clive Hansen <mrclivehansen@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: dual mot tc (fwd)
>
> Is there a formula for calculating the capacitance if using several wine
> bottles (I am looking for around 5nf)
>
> On 10/8/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> >
> > ---------- Forwarded message ----------
> > Date: Mon, 8 Oct 2007 11:43:02 -0700 (PDT)
> > From: G Hunter <dogbrain_39560@xxxxxxxxx>
> > To: Tesla list <tesla@xxxxxxxxxx>
> > Subject: Re: dual mot tc (fwd)
> >
> > No problem.  Glass bottles and NSTs go together well.
> > 12oz (355ml) beer bottles are good for 750-900pF each.
> > A 6-pack is worth roughly 5nF.  A 12-pack will get
> > you 10nF.  These can stand up to any NST, including
> > the 15kv units.  For a "dry" cap, try wrapping the
> > bottles in kitchen foil.  You can stick it on with
> > spray glue.  Just roll the bottle up in foil, then
> > smooth it down using the back of a big spoon.
> >
> > I've assembled caps like this as big as 80nF
> >
> > http://hot-streamer.com/greg/bottle.htm
> >
> > and gotten satisfactory performance from them.  They
> > are not in the same league as a commercial plastic
> > film pulse cap, but they are very inexpensive.
> >
> > Cheers,
> >
> > Greg
> >
> > --- Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> > >
> > > ---------- 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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> > >
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> > > > >
> > >
> > _________________________________________________________________
> > > > > Live Earth '07 updates, artist info & concert
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