Re: [TCML] Jacob's Ladder

[DC Cox <resonance@xxxxxxxxxxxx>]

Yes, it will try to draw approx 35 Amps and either blow your mains fuses or
damage the MOT.  If you fuse it for a higher current it will
fry the MOT in short order.

Best to set up two identical MOTs (so no circulating currents), then connect
HV secs in series.  Use a separate power reactor on each
primary side and connect to two separate 120 VAC circuits (you have to test
to make sure you are not trying to operate both MOTs off the same
circuit or they will draw too much current and blow your fuses or breakers.

I use a separate power reactor on each one and set the current (controlled
by number of windings) to approx 15 Amps (takes 300 turns on a 1.5 x 1.5 x
14 inch long M-50 core.  Then draw is 15 Amps off each separate circuit, so
total is 30 Amps at 120 VAC for a nice 3.6 kW climbing arc that is a
very powerful flame.

Dr. Resonance




On Mon, Feb 2, 2009 at 3:59 PM, Thomas Ryckmans
<thomas.ryckmans@xxxxxxxxxx>wrote:

> What happens if you don't have current limiting on a MOT-powered Jacob's
> ladder? The current flowing through the spark keeps going up until the MOT
> fails?
>
> BTW there was some plans about a "Gabriel's electrode" here:
> http://www.repairfaq.org/sam/jacobs.htm
>
> >From Big Clive
>
> Would this help power a JL with MOTs? Clive - I hear your comments about
> MOTs loud and clear - just asking
>
> Thomas
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of bartb
> Sent: 01 February 2009 03:07
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Jacob's Ladder
>
> Could also consider a GM HEI coil trigger as was done with sparks gaps
> in 2000 and 2001 (in place of the NST).
> Bart
>
> G Hunter wrote:
> > Jeremy,
> >
> > Don't mix NSTs and MOTs.  It's a formula for failure at best, and
> destruction of your NST at worst.
> >
> > Your parallel idea, for example, will simply short out the NST output
> across the relatively low impedance MOT secondary winding.  This will
> prevent the NST from developing sufficient potential to start your JL, and
> I
> have no idea what the MOT output will do to the NST secondary.
> >
> > I understand your problem--the NST can self-start a JL, but the wimpy
> current doesn't make much of a display.  On the other hand, the MOT can
> create an impressive flaming arc, but the JL rods must be almost touching
> before the MOT will strike an arc.  With such a close spacing, the arc
> won't
> climb.
> >
> > Have you considered a 4-pack MOT stack?  Four MOTs with their secondaries
> in series will develop roughly 8kvac.  A 5th MOT can be used as a series
> reactor to limit the wallplug current.
> >
> > A simpler but more expensive solution is to parallel several NSTs for
> more
> current.
> >
> > Cheers,
> >
> > Greg
> >
> >
> >
> >
> > --- On Sat, 1/31/09, Jeremy <jeremy_runescape@xxxxxxxxxxx> wrote:
> >
> >
> >> From: Jeremy <jeremy_runescape@xxxxxxxxxxx>
> >> Subject: [TCML] Jacob's Ladder
> >> To: "TCML" <tesla@xxxxxxxxxx>
> >> Date: Saturday, January 31, 2009, 11:21 AM
> >> hey all, i just wanted to ask if it is possible to create a
> >> jacob's ladder circuit with a NST and MOT in parallel,
> >> the NST to supply the HV for improved arc initiation, and
> >> the MOT for increased amperage for larger, more sustained
> >> arcs. will the NST secondary simply fry or will it's
> >> shunting and inductance protect it? and what about the
> >> secondary insulation for the MOT? am i also right to assume
> >> that the current *should* flow through the arc and not the
> >> MOT secondary (thus sparing it's insulation) cos of the
> >> secondary's inductance?
> >>
> >> thanks,
> >> jeremy
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