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RE: MOT-powered coil questions
Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
Greg, Dwight,
I think starting off using "any" number of MOTs is tough for a novice to
start out.
I'd definitely suggest going the NST route for a first coil.
Dan
> OK Dwight,
>
> I stand corrected. Apparently, the lower limit for
> spark gap tesla coil supply voltage has yet to be
> established. Perhaps someday under the guidance of
> this sage group, you can dispense with the transformer
> altogether, and fire a coil directly from 120vac wall
> current. However, I'm going to go out on a limb here
> and assume that you are not interested in micro- or
> flea-power coiling for your first effort, nor are you
> interested in sub-kilovolt spark gap research. If I
> correctly understood your initial query to the list, I
> believe you are interested in building a practical,
> MOT-based Tesla coil, and that you are seeking useful
> advice to that end. If this is so, then based on my
> limited experience, I suggest that 4kvac from a pair
> of MOTs is a tough way for a novice to start out.
> Quenching a low voltage/high current arc presents
> difficult design challenges that most newbies would do
> better to avoid. Raising the voltage a bit with a
> level shifter, or by simply using 4 MOTs instead of 2,
> sidesteps many problems and greatly simplifies spark
> gap design. If you'd like to hear more of my
> half-baked ideas on MOT power supply design for tesla
> coiling, please refer to my various primers on the
> subject.
>
> http://hot-streamer-dot-com/greg/MOT_chat.htm
> http://hot-streamer-dot-com/greg/MOTDOC.htm
> http://hot-streamer-dot-com/greg/4pack.htm
>
> Best Regards,
>
> --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "Edward Wingate by way of Terry
> > Fritz <teslalist-at-qwest-dot-net>"
> > <ewing7-at-rochester.rr-dot-com>
> >
> > Tesla list wrote:
> >
> > > Original poster: "by way of Terry Fritz
> > <teslalist-at-qwest-dot-net>"
> > <dhmccauley-at-spacecatlighting-dot-com>
> > >
> > > I disagree whole heartedly. Even 3kVAC is enough
> > for a reliable spark-gap
> > > driven tesla coil. Plus many of us, Ed Wingate,
> > Steve Ward, Gary Lau, and
> > > others have built
> > > very successful tesla coils utilizing only 4kVAC
> > transformers. Theres more
> > > than enough margin for reliable operation.
> > >
> > > The Captain
> > >
> > > Dan,
> >
> > After my "test" minicoil was completed and while
> > waiting for my France
> > 4020SE transformer to arrive
> > I got 3" sparks using a 2KV/20MA transformer pulled
> > out of a HiPot tester
> > firing through 2 gaps of
> > my 21 gap fixed gap assembly. The operation of the
> > coil was stable even
> > with the flea power.
> >
> > Ed Wingate RATCB
> >
> >
>
>
>
> =====
> Gregory R. Hunter
>
> http://hot-streamer-dot-com/greg
>
> _
>
>