## RE: [hameltech] Re: Resonate Freq of a coil.

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• Hello Justin, The answer to your question depends on a few variables you have not yet mentioned pertaining to your application, such as how the coil will be
Message 1 of 6 , Oct 2, 2001
Hello Justin,

The answer to your question depends on a few variables you have
not yet mentioned pertaining to your application, such as how the
coil will be coupled in your intended circuit. There are so many
problem. What kind of bandwidth, for instance, do you want this
coil to respond to? What kind of Q do you want?

Here are a couple of quick-study refreshers to acquaint you with
some of the basics. In your typical LCR circuit (a coil with
inductance L, resistance R and capacitance C), resonance is when
the inductive reactance (X sub L) is made equal to the circuits'
capacitive reactance (X sub C). To complicate matters, these
two have opposite effects on the impedance (Z) of the circuit.
X sub L and X sub C can only be equal for one frequency, and it
is this relationship that allows resonance (and radio) to work.

Here are some links for you to look over at your convenience:
http://www.tpub.com/neets/
http://www.tpub.com/neets/book9/index.htm
http://www.tpub.com/neets/book9/34b.htm
http://www.tpub.com/neets/book9/34.htm

They discuss some basic principles that you might not have seen
on the Tesla sites you've looked through. Since the diameter of
the coil-wire and the spacing of the windings is of most concern
to you, consider the effect of increasing or decreasing these on
the reactive inductance and reactive capacitance of the whole
circuit that your coil is part of.

You can e-mail me off-list if you have more questions. I don't
have all the answers, but if I don't know the answer directly,
I can certainly tell you where to find one that works for your app.

Best Regards,

Russ Jones, Lightwave Engineer
Johnston Technical Services

> -----Original Message-----
> From: jszymanek2000@... [mailto:jszymanek2000@...]
> Sent: Tuesday, October 02, 2001 6:28 PM
> To: hameltech@yahoogroups.com
> Subject: [hameltech] Re: Resonate Freq of a coil.
>
>
> I have ~5-6 of these programs. I would like the formulas so I could
> manipulate them to solve what I need. One of the program tells the
> best wire gauge to use, but you can't input it.
> Any electrical engineers in the group ;-) ?
> -Justin
>
> --- In hameltech@y..., "Georgia Hartley" <ghartley@t...> wrote:
> > search the tesla sites, I've seen one or two programs there that can
> do that
> > but I can't remember where and they've probably moved by now.
> >
> >
> > -----Original Message-----
> > From: jszymanek2000@y... <jszymanek2000@y...>
> > To: hameltech@y... <hameltech@y...>
> > Date: Monday, October 01, 2001 9:59 PM
> > Subject: [hameltech] Resonate Freq of a coil.
> >
> >
> > >Hey guys,
> > >
> > >
> > >I'd like to thank everyone for their input on the human resonance freq
> > >question. Now I have another one. Does anyone have formulas that can
> > >be used to calculate the resonance freq. of a coil? I have found a
> > >few, but in particular, I am looking for one that includes the gauge
> > >of the wire.
> > >
> > >So far the ones I have found include the diameter and height of the
> > >coils. Other use only the diameter and the number of turns. I
> > >basically would like to be able to find the spacing between wraps to
> > >get a coil to resonate at a certain freq, when I have the diameter and
> > >length fixed.
> > >
> > >-Justin
> > >
> > >
> > >Post message: hameltech@y...
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> > >List owner: hameltech-owner@y...
> > >
> > >
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> > >
> > >
>
>
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