[TCML] capacitors

[bartb]

Douglas,

I should have also included the oscillation frequency of the Tesla Coil. 
The pulse cap also needs to handle the RF without heating. Thus, the 
dielectric is important in your decision.

Take care,
Bart

bartb wrote:
> Hi Douglas,
>
> douglas smith wrote:
>> i was wondering 2 things
>>   first, i have recenty run accross a 35 kv .03 uf pulse capacitor 
>> for 99.00
>>   would it be better to use one like this or to use mmc combination ?
>>   not sure but looks to me that it will cost about the same.please 
>> correct me if i'm wrong.
>>   target cap .03uf
>>   
>
> If the pulse cap is rated for the pulse rate of the gap, then it may 
> be fine. You might want to let the list know about any specs you can 
> find out about. My opinion is both pulse and mmc's are equivalent if 
> both are rated for the pulse rate (I use both). One thing about MMC's 
> is if a cap fails, replacement costs is low. Not so with a pulse cap. 
> For a .03uF cap size (nice and large), I personally would go after a 
> pulse cap string (like three .01uF in parallel). But, $99 is hard to 
> beat and a heck of a price if it's worthy of Tesla duty.
>
>>     secondly, as for spark length on javatc i get the same results 
>> with a nst 7.5/60 as i do
>>   with a 15/30
>>   please explain
>>   
> Spark length is based on John Freau's power equation which is 1.7 x 
> sqrt(input power). Because the power for both transformers is 450W, 
> the spark length comes out the same. Also, this spark length is based 
> on 120 bps and considered optimum. This is the spark length listed in 
> the Transformer Power Section. There are two other spark length values 
> (one in the static section and one in the rsg section). These spark 
> length values are similar and based on power, but also includes bps, 
> power across the gap, etc.. In some cases it's less than the JF 
> equation and in some cases greater. I usually look at these 
> personally. The main thing to remember is that all do not account for 
> variations in gap efficiency. Those losses can be huge and directly 
> affects actual spark length.
>
> Take care,
> Bart
>
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