RE: [TCML] Trans-cap uf matching, over/under?

["Lau, Gary" <Gary.Lau@xxxxxx>]

I'm not sure there is any consistent optimal multiplier from Mains-Resonant to optimal LTR cap value.  It's been my experience that 2X the MR value is best with a static gap.  This may vary with the particular NST used.  I think your choice of a .011 uF cap is fine.  I think that would be far superior to using the .0033uF cap, as bang-size is strongly correlated with spark length (but not brightness).

Yes, you can treat two 15/30's the same as a 15/60 for all calculations.  For my 15/60, I used .02uF with a static gap, and .04uF with a sync 120BPS RSG.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Brian Hall
> Sent: Tuesday, December 29, 2009 9:23 PM
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Trans-cap uf matching, over/under?
> 
> 
> 
> I have a 15kv/30ma NST so the ideal capacitance is .0053 uf, but since I don't want
> it to match impedance with the transformer and risk frying out a leg, I have read
> that 1.3 to 1.4 x that capacitance is desirable, aka LTR (larger than resonant ...
> impedance)
> 
> 
> 
> So, that would give me a range of .0068 to .0074 uf for the tank capacitor (at
> around 30 to 40 kv)
> 
> 
> 
> My question is how would the performance be affected if I were to use 0.011 uf (a
> hair over 2 x resonant impedance)?
> 
> 
> 
> And what would happen if I go a bit under it, such as .0033 uf?  What effect would
> that have on the TC circuit or even the hv transformer?  Would it hurt anyting?
> 
> 
> 
> Lastly, if I were to connect 2 NSTs of the same value in parallell, such as two 15/30
> NSTs, to basically get one 15/60 power supply, would the calculation for the
> impedance of the 2 NSTs of Z = E / I (to find the cap value) be the same as if I had
> a single 15/60 NST?  if it were, then .011 uf would be a hair above resonance with
> the transformer, but not as high as 1.3 x above it ...
> 
> 
> 
> ----------------------------------
> Brian Hall
> 
> 
> 
> 
> 
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