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Re: To Kevin


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

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			   Alfred A. Skrocki
		  Alfred.Skrocki-at-CyberNetworking-dot-com
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