Nope, just raw AC, 4-ish kV. You'll have to keep your clearances really
tight in the spark gap (I doubt a static gap would work in this config at
all...) But it's been a really solid performer for me, and is my go-to
travel coil.
On Dec 23, 2016 11:14 PM, "Martin Slinning" <martinslinning@xxxxxxxxx>
wrote:
> Hi Scott.
>
> Thanks for reply.
>
> No voltage dobblers or anything in your setup? About 4.5 kV AC?
>
> Bst rgs Martin
>
> 2016-12-23 16:16 GMT+01:00 Scott Bogard <sdbogard@xxxxxxxxx>:
>
> > If I could just chime in, I honestly think the best MOT design, as far as
> > something for students, is a simple twin MOT (center tap grounded). I
> get 5
> > foot arcs from mine, and it requires very little work or know-how, zero
> > expense, and has proven incredibly durable (and I've burned up literally
> > dozens of MOTs doing things wrong, so when I say durable, I mean bullet
> AND
> > fool proof). Just use no ballast, and size your cap to match your
> > breakrate so that you get 70-ish percent charge per bang (async spark
> gap).
> >
> > On Thu, Dec 22, 2016 at 2:48 PM, Martin Slinning <
> martinslinning@xxxxxxxxx
> > >
> > wrote:
> >
> > > Hi tedl in New Zeeland!
> > >
> > > Exellent! Fantastic!! This is the kind of setup we are looking for. Do
> > you
> > > still have access to it? Or, do you have pictures? How did you solve
> the
> > > part with just the outer two in transformer oil? This is really
> > > interesting. I think this is the biggest setup i have heard of so far!
> > > I think we can manage from your decription, but some pictures would
> > really
> > > help..
> > >
> > > Best regards
> > > Martin
> > >
> > > 2016-12-22 9:13 GMT+01:00 TESLA <tesla@xxxxxxxxxxxxxxx>:
> > >
> > > > Hi Martin
> > > >
> > > > I built a really high power tesla from MOT s (14 in the whole
> machine)
> > > >
> > > > * That was 6 MOT's in primary centre ground 3 per side (shunts
> > removed)
> > > > input load shared by separate power to each half of the 6 MOT's
> > > > * Considerable PFC was used and NO other ballasting was needed (drew
> > 50a
> > > > or so from my 230v supply at full bore)
> > > > * Outer MOT's in xfrmr oil (no mains eths used, some like to apply
> > that
> > > I
> > > > recommend swamping capacitance between core and secondary and core
> and
> > > > primary to equalise stress if floating core
> > > > * FW bridge of 3A 1kV diodes (just lots and lots used overkill and
> no
> > > > equalising components)
> > > > * DC Pi filter of 2uF caps and 10mH MOT arrage (gapped MOT's of
> 0.3mm
> > > > array of 4 , 2 in series then parallel two of those)
> > > > * Ring up inductor another array of 4 gapped MOT's (parallel two
> sets
> > > of
> > > > 2 in series)
> > > > * DQ of about 50 1n4007
> > > > * Bleeders on ALL Caps (several independent chains in case one chain
> > > went
> > > > open)
> > > > * 90nF Cp (Used CDC 942C series 942C16P33K, for big coils these are
> > > > better value than the so called Geek group ones
> > > > * 300bps rotary SG (was sync but need not have been)
> > > > * Big secondary and large topload (8" and also a 12" at times and
> > 300mm
> > > > x1.1m top)
> > > >
> > > > That beast did well over 10kVA and over 3.5m arcs, it is perhaps a
> > little
> > > > ambitious but makes good use of very cheap components,unsafe in the
> > hands
> > > > of untrained users, I recently gave it to an enthusiast with better
> > > > location to use it. Needs a dedicated supply (spa pol in my case, all
> > > > stoves and water heaters switched off when it was running to keep
> pole
> > > fuse
> > > > intact.)
> > > >
> > > > Good luck tedl in NZ
> > > >
> > > > -----Original Message----- From: Martin Slinning
> > > > Sent: Thursday, December 22, 2016 5:15 AM
> > > > To: tesla@xxxxxxxxxx
> > > > Subject: [TCML] Tesla coil setup using MOT
> > > >
> > > > Hi.
> > > > My students and i have just finished building av flyback/zvs coil and
> > > want
> > > > to step up to a New coil using MOTs. We have seen different setups
> but
> > we
> > > > are looking for tips on how to build the most effective coil. In
> Norway
> > > we
> > > > have limited access to NST, but MOTs are no problem. We have now
> about
> > 11
> > > > mots and a bunch of MO caps and diodes.
> > > > We are planning on making av rsg using av 2800 rpm motor and an
> > inverter
> > > > to raise to 150-200 Hz to get whatever rpm we need.
> > > > Anyone who can give us tips on what to do, and not do, are greatly
> > > > appreciated.
> > > >
> > > > Best regards
> > > > Martin Slinning.
> > > > (Teacher Electric automation at Norwegian highschool.)
> > > >
> > > >
> > > > Sendt fra min iPhone
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