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Re: To Kevin
From: DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Monday, September 15, 1997 7:07 PM
To: Tesla List
Subject: Re: To Kevin
To: Alfred & Greg L.
Many of the later design induction coils did use a primary capacitor to
resonate the primary inductance with the secondary inductance. Some of
them performed better than a standard turns ratio would predict because
they were actually resonance transformers with an iron core but not in the
classical sense of enclosed magnetic field as the core was straight.
We also made an experimental Tesla coil with a ferrite core. We stuck a
long ferrite rod about 50% up inside a fiberglass water tank and
pressurized the tank with nitrogen gas. It did work quite well and did not
spark over to the ferrite rod around which we wound a heavy 4 AWG welding
cable. Only problem was we had to bleed the gas each time to effect tuning
until we got it right. This was about 15 years ago so I don't have all the
details of the unit anymore. Ferrite cores don't necessarily destroy a
Tesla coil providing the design is proper.
Sincerely hoping this doesn't become another "Coulomb" post!!!!!
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: Re: To Kevin
> Date: Monday,September 15,1997 5:11 PM
>
>
> From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
> Sent: Sunday, September 14, 1997 1:28 PM
> To: Tesla List
> Subject: Re: To Kevin
>
> On Sunday, September 14, 1997 5:14 PM Malcolm Watts
> [SMTP:MALCOLM-at-directorate.wnp.ac.nz] wrote;
>
> > My opinion for what it's worth:
> >
> > > From: DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
> > > Sent: Sunday, September 14, 1997 3:29 PM
> > > To: Tesla List
> > > Subject: Re: To Kevin
> > >
> > > To: Greg
> > >
> > > I think it still counts as a TC because a lot of earlier work Tesla
did was
> > > with iron core inductor induction coils. True it doesn't have an air
core
> > > but Tesla's earlier work he used his recent developed high freq
generators
> > > to drive classic induction coils which acted in a manner similar to a
> > > flyback.
>
> I differ with DR.RESONANCE on this matter, I don't think it is
> appropriate to call all of Dr. Tesla's High frequency devices Tesla
> Coils. A Tesla coil by definition is an AIR CORE RESONANCE
> transformer that DOES NOT follow the classical turns ratio but
> instead it's output is related to the ratio of primary to secondary
> capacitance or inductance. Tesla's early work with mercury turbines
> feeding induction coils does not fit this definition by any stretch
> of the imagination.
>
> > > > From: Greg Leyh[SMTP:lod-at-pacbell-dot-net]
> > > > Sent: Saturday, September 13, 1997 5:12 AM
> > > > To: Tesla List
> > > > Subject: Re: To Kevin
> > > >
> > > > DR.RESONANCE wrote:
> > > >
> > > > > > [Aperiodic wrote]
> > > > > > One last thing. I'm a senior in high school and last year, for
the
> > > > > > first time, a science fair sponsored by IBM was opened up to
the
> > > > > > highschool level. (I did research on chaos thoery and won
first place
> > > > > > in the math catagory :-) ). Anyway, I was hoping I could
enter my coil
> > > > > > in the competition. There's just one thing, and it seems to
bother me.
> > > > > > The judges that they have aren't the brightest people in the
world and
> > > > > > for most of them the first thing they'll ask is, "what
practical
> > > > > > purposes does this serve?"
> > > > >
> > > > > Common TC application is the computer & TV set. The CRT's use a
small high
> > > > > frequency transformer called a "flyback" that generates the high
voltage to
> > > > > accelerate electrons down the tube to strike the screen.
Flybacks usually
> > > > > run around 30 KHZ and are, in effect, small Tesla coils. Tesla's
main
> > > > > contribution with the TC was the concept of tuned circuits, ie,
the tuned
> > > > > LC tank circuit in the primary and sec systems. This formed the
basic
> > > > > building block of all radio transmitters and receivers from his
time
> > > > > forward. He actually received the patent for radio in 1946, 3
years after
> > > > > his death. Hope this helps to enlighten the "bright people".
> > > >
> > > > Is a TV flyback really a classic, loosely coupled Tesla Coil, or is
it just
> > > > a flyback transformer?
> > > > This use has probably been mentioned already, but my Miller TiG
welder has
> > > > a nice Tesla Coil inside of it, to initiate the arc with greater
ease.
> > > >
> > > > -GL
> >
> > I think the flyback is fundamentally an induction coil. It works by
> > storing energy in the core, then releasing it from core to the load.
> > The TC we know and love on the other had is a cap discharge device
> > and is tuned to boot.
>
> I fundamentaly agree with Malcolm, a flyback transformer CAN NOT
> function without its ferrite core, by contrast a ferrite core would
> destroy a Tesla coils operation. I do differ with Malcom though on
> the issue of "tuned", typicaly flyback transformers are also tuned,
> in fact they are designed to resonate at about twice the horizontal
> oscillator's frequency roughly 30 KHz.
>
>
> Sincerely
>
> \\\|///
> \\ ~ ~ //
> ( -at- -at- )
> -----o00o-(_)-o00o-----
> Alfred A. Skrocki
> Alfred.Skrocki-at-CyberNetworking-dot-com
> .ooo0 0ooo.
> -----( )---( )-----
> \ ( ) /
> \_) (_/
>
>