Re: Tesla Software

• To: tesla-at-pupman-dot-com
• Subject: Re: Tesla Software
• From: Richard Hull <hullr-at-whitlock-dot-com>
• Date: Tue, 09 Jul 1996 09:15:15 -0700

Tesla List wrote:
> 
> >From 100624.504-at-CompuServe.COMWed Jul  3 22:18:22 1996
> Date: 03 Jul 96 08:43:04 EDT
> From: Alan Sharp <100624.504-at-CompuServe.COM>
> To: Tesla List <tesla-at-poodle.pupman-dot-com>
> Subject: Re: Tesla Software
> 
> Graham,
> 
> I guess I'ld like to know for a give secondary and toriod
> size what the resonance frequency is going to be and
> some idea of the Q and input impedence if driven
> as a magnifier. Oh yes and I'ld like to know exactly
> how insane I am to be playing with these things :)
> 
> Doesn't have to be too accurate +/- 0.000001% will do ;)
> 
> Good luck,
> 
> Alan Sharp (UK)


Alan,

I do not know of any software which will correctly predict such values.  
The euations for toroidial capacitance are terrible.  Even an error of 5% 
in the equations can shift the resonant frequency of a combo about 
100Khz! (In small coils with largish toroids.)  The free swinging 
isolated capacitance, even if precisely measured, will change when on a 
coil (proximity effect).  The only way I know to get the values you seek 
is to build and measure the finished product!

Richard Hull, TCBOR

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