Re: [TCML] Pairing two seperate coils of different powers

[EVP <evp@xxxxxxxxxxx>]

   Interesting point, BUT!  In one of  Tesla's published comments he 
specifically mentions an interesting property of a bipolar coil setup.  
I can't remember if he shows a schematic indicating one gap and the two 
primaries in series but think he does.  Unfortunately it's in my 
bookcase at work and can't look it up but have often cited the page to 
my radar colleagues who thing that 'pulse compression is a modern 
invention'.  Anyhow, what he says is that by varying the tuning 
[relative frequency] of the two coils he can produce any spark sound he 
wants including the very sharp sound that one would expect of a 
Wimshurst machine spark.  Whether he ever ran the experiment or "just 
knew it would work" [he had remarkable intuition] he's essentially 
correct.  If there is any frequency difference between the voltage on 
the two secondaries there will be periodic times at which the voltages 
between them double.  For example, if one coil is tuned to 100 kHz and 
the other to 101 kHz the two signals would add up to double 1000 times a 
second.  One form of generating sharp pulses which is in use today 
involves adding a number of identically-spaced voltages.  For example, 
with 10 voltages the peak voltage difference is ten times that of a 
single one.  No average power gain of course.

Ed



Lau, Gary wrote:

> There's a lot more to determining the relative phase of two Tesla coils than the direction of the windings.  Even if the two gaps were completely synchronized (which will NEVER happen), consider that if the two secondary systems differ in frequency by any amount (which will ALWAYS be the case), the phase will be out of whack in just a couple of cycles.
>
> But to your question, I don't think there's any hazard to allowing them to arc to one another, and that their NST's are different doesn't enter into it at all.
>
> Regards, Gary Lau
> MA, USA


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