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Re: Anybody answering this? (Primary current and voltage effects)



In a message dated 11/11/98 7:07:12 AM Pacific Standard Time, tesla-at-pupman-dot-com
writes:

<< 
 A basic question.
 
 I have got a 4.33" diameter secondary TC, an RSG, and I want to increase
 the spark length. I am already using the RSG to benefit of the fast break
 rate technique: what I am looking for is thus higher voltage on the
 secondary toroid.
 
 I am not speaking about modifying my current TC, but about what is worth
 building as my TC number 2.
 
 Which of the following paths you would suggest me?
 
 1. Increase the primary tank voltage from the current 6.5 kV AC to, say, 8
 kV AC.
 
 2. Increase the primary tank current together with the primary capacitor
 and retune. I suppose my current tank can provide about 0.25 A and I use a
 0.05 uF capacitor.
 
 3. There is no way: I must build a bigger secondary, 6" or more.
 
 And, in general, if I am able to "pump" more current into the primary
 winding, will that translate into a higher voltage at the secondary
 terminal or only into more current in the streamers?
  >>

Marco,

If I understand this correctly, you now have a 4.33" diameter coil and use a
6.5 kv  250 ma transformer - and plan to build a larger coil and use the same
transformer.  Do I have that correct?  250 ma is quite a lot of current
already, good supply (1.6 kva).  Increasing the voltage would certainly help
the performance of the coil.  Most coilers use an AC supply of 10 kv to 15 kv.
In your case, I would guess you would do as well or better with a supply that
delivers twice the voltage at half the current - test results available from
anyone on this? 

I think you would be happy with the performance of a 6.0" diameter coil with a
.05 mfd capacitor and large toroid, 30" or 40" in diameter or larger.

As to you last question - holding the voltage constant and increasing the
current available to the primary does improve the performance of the system,
depending on its size and current power input.  For a given size coil, I am
convinced there is a point where adding more input power results in no or very
little increase in performance.  You can see the curve on this in your mind:
length of output sparks vs input power.  Based on my own experinece, for a
given system, the curve changes rapidly for a while then finally almost
flattens out - and somewhere out there on the flat part of the curve is where
the secondary burns up.

Ed Sonderman