Re: Formula for calculating self resonant frequency of secondary coil or helical coil?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips by way of Terry Fritz <teslalist-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
 >
 > Original poster: "Mercurus2000 by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <mercurus2000-at-cox-dot-net>
 >
 > Hello everyone, I was just curious, I know there are programs out there
 > that calculate the self resonant frequency of a secondary coil, like
 > wintesla etc. But does anyone know the actual equation the programs use? I
 > would like to know so I would be able to find the frequencies without
 > having to use a computer and the like

	Sure.  Most just use one of Wheeler's approximations for inductance and
some form of Medhurst's approximation for self capacitance; simple pen
and pencil or calculator job.  If you or any other interested person can
read BASIC code I can sent you the text source file for a BASIC program
that does exactly that.  Equations are obvious from the listing.

Ed