Re: Re Secondary Coil Resonant Frequency?

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Re Secondary Coil Resonant Frequency?
From: Tesla List <tesla-at-stic-dot-net>
Date: Sun, 2 Nov 1997 22:43:17 -0600
Approved: tesla-at-stic-dot-net

From: 	Barton B. Anderson[SMTP:mopar-at-mn.uswest-dot-net]
Sent: 	Thursday, October 16, 1997 7:39 PM
To: 	Tesla List
Subject: 	Re: Re Secondary Coil Resonant Frequency?

Adam, good question!
I would also be interested in a formula, but I'm guessing there probably isn't
such a beast. It seems to me there are too many variables (wire size and type,
wire insulation types and dielectrics, spacing, coil size, outer coatings,
etc...) but maybe someone has a cheat-sheet out there based on experience? If
not, maybe we could post our measured  L's and C's and come up with one, at
least on a common wire type ( I assume is solid copper armored
polythermalese?).
Bart

Tesla List wrote:

> From:   Adam[SMTP:absmith-at-tiac-dot-net]
> Sent:   Saturday, November 01, 1997 9:15 PM
> To:     tesla list
> Subject:        Secondary Coil Resonant Frequency?
>
> Someone asked the following question a while back, and there was no
> satisfactory answer.  The question was:  How do you calculated the
> resonant freq. of a secondary, with and without the toroid?
>
> The TESLA-EQ.TXT has a formula, but just calculates the 1/4 wavelength
> frequency that corresponds to the length of wire used.  Does this number
> have any value to us at all?
>
> It seems like finding the self inductance of the coil and the
> self-capacitance and using these values to calculate the frequency by
> 1/(2pi*sqrt(LC)) would give the correct results, and such calculations
> could also be made to include the toroid.
>
> But, how do you find these two values by calculation alone (before
> building the thing)??? Do you have to resort to a messy Biot-Savart
> calculation, or is there a quick approximation?
>
> Could someone give us solved example of how it is really done??? (that's
> a challenge!)
>
> -Adam
>
> --------------------------------------------------------------------------
> Adam Smith
> absmith-at-tiac-dot-net
> Epoch, Inc. Digital Music Project
>
> www.tiac-dot-net/users/absmith/     Now with MP3!     Musik. Macht. Macintosh.
> --------------------------------------------------------------------------