Re: [TCML] VTTC-tuning. John got me started ;-)

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

Very interesting paper.
But what do you think of formula:

0.5*L*di/dt < V < L*di/dt

Note that this gives good agreement with Dr. Resonance's  max voltage formula of a typical coil:

V=0.7*SQRT(Ls/Lp)

The factor 0.7 is somewhere between 0.5 and 1 so we have:

V=0.7*L*di/dt

Dex




  
--- bartb@xxxxxxxxxxxxxxxx wrote:

From: bartb <bartb@xxxxxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Cc:
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
Date: Mon, 06 Apr 2009 18:14:33 -0700

Hi Dex,

Let me point you to Paul Nicholson's TSSP site. There have been numerous 
measurements made regarding current distribution, base current 
measurements, etc.  There is a link on the front page to pn2511. Read 
through this document (it's right down your path of interest). This may 
give you a better understanding of what is happening in the background 
of Javatc which is accounting for the distribution along the secondary.
http://abelian.org/tssp/

Take care,
Bart

Dex Dexter wrote:
> Yes ,you understand me now.
> The problem with this can be that current distribution prior and after spark breakout across secondary isn't the same.
> That's the capacitance  spark loading effect.
> That will affect more tesla coils with small toroids but big sparks.
> We can measure bottom current and make the estimation  only.
>
> Dex
>    
>
> --- bartb@xxxxxxxxxxxxxxxx wrote:
>
> From: bartb@xxxxxxxxxxxxxxxx
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Cc:
> Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
> Date: Fri, 3 Apr 2009 18:59:48 -0700 (PDT)
>
> Hi Dex,
>
> (hope you get this ok. My server has a problem and I'm using a backup web
> mail thing to write this).
>
> Are you talking about capturing base current waveforms and looking at the
> data just before breakout? If that is the case, then yes, I agree with
> you. This will eliminate everything after breakout.
>
> Excellent! I think I understand where you are going with this. As long as
> you store the data and differentiate the time at which breakout occurs
> (ignoring anything after breakout), then yes, you will get a good look at
> top volts in a one-shot mode of operation. Continuous operation will prove
> difficult of course.
>
> Take care,
> Bart
>
>
>
>   
>> Hi Bart,
>> No I don't think so.
>> It doesn't depend on the temperature of the day,humidity,radius of
>> curvature etc.
>> If you consider it more it is not the formula for the prediction.
>> It is formula for calculation if you know secondary base current (or given
>> the current).
>> That's the voltage developed across inductor.
>> The only unknown thing is "L" which varies from design to design and size
>> of topload.
>>
>> Dex
>>     
>
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