Re: [TCML] Caps

["jhowson4@xxxxxxxxxxx" <jhowson4@xxxxxxxxxxx>]

So, resonant rise is in its most basic form when the capacitor becomes fully charged at the peak of the line wave form. So it is dependent on how much power your transformer is sourcing.  A small nst will have a small resonant cap size, while a large will be larger.  And even larger for pole transformer etc. 

If you are using an nst I am pretty sure someone has a list of various types and the resonant tank cap size. Meaning you don't need to figure out the inductance part.  Infact if you look for the list of mmc caps for various transformer powers I think it has the lower, resonant and larger values listed. 

Some one else can speak more in detail of when you should choose a lower value or a larger value.  I would not use resonant unless you have a sync rotary gap. 

I usually do larger than reasonance  for my coils.  If I recall I think having larger than reasonance helps prevent the cap from being overvolted. 



John "Jay" Howson IV

Sent from a tiny phone with a tiny keyboard. 

----- Reply message -----
From: "Christian Hill" <monolegal@xxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Subject: [TCML] Caps
Date: Wed, Aug 29, 2012 2:22 am


Hello. I am building my first coil and have a few questions. I read that
you should stay away from using a resonate sized capacitor as it can cause
a "condition called resonate rise." Multiple sources say to use a "larger
that resonate" capacitor to keep this from happening. I've read that you
can also use a multiple of the LTR capacitance value as well. Let's say
that the optimum LTR capacitance is 10nF. Since I can double it and use
20nF would I also be able to half it and use 5nF? (Assuming that my voltage
needs were met, of course).

I would assume that the closer I get to the resonate capacitance value, the
better chances of resonate rise I have. So I should stay as close as
possible to a multiple of the LTR capacitance, correct? Or should I just
meet my voltage needs, tune the coil accordingly, and make use of safety
gaps?

I am asking all of these capacitor questions because I want to get the most
out of my money. Those Cornell-Dubillier 942C20P15K-F's can really add up
when you're on a budget. I tried searching through the archives and have
poured over dozens of tesla coil guides but found nothing that really
answered my questions. Thank you very much for your help.
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