Re: frequency

• To: tesla-at-pupman-dot-com
• Subject: Re: frequency
• From: "Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Wed, 07 Apr 1999 18:08:50 -0600
• Approved: twf-at-verinet-dot-com

> Original Poster: "Ian S" <ian115-at-hotmail-dot-com> 
> 
> Is there a simple formula for figuring out the frequency of the output 
> of the secondary. 

Approximate frequency is = 1/(2*pi*sqrt(Lsec * Csec))

Lsec is easily calculated using Wheeler's formula (accurate to 5%). Csec is
a bit trickier, since you have to allow for the self capacitance of the
windings of the secondary, as well as the top load, as well as the
capacitance of any streamers that are emerging from the top load.

There are several spreadsheets available (take a look at www.pupman-dot-com )
that simplify the process and use empirically determined formulae to
approximate some of the above.

In any case, it all an approximation. Build it and measure it is the best
bet.
> 
> Does the frequency depend on the spark gap? 
Not really... The frequency is more determined by the resonant frequency of
the primary LC circuit and the secondary LC circuit (which aren't
necessarily the same, and change during operation anyway).

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