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Re: Tank frequency

Tesla List wrote:
> 
> > Subject: Tank frequency
> > Subject: Tank frequency
> 
> >From volantis-at-sover-dot-netWed Oct  9 22:39:34 1996
> Date: Wed, 9 Oct 1996 14:38:47 -0400
> From: David Thomson <volantis-at-sover-dot-net>
> To: tesla-at-pupman-dot-com, Tesla-list-subscribers-at-poodle.pupman-dot-com
> Subject: Re: Tank frequency
> 
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> 
> > From: Tesla List <tesla-at-poodle.pupman-dot-com>
> > To: Tesla-list-subscribers-at-poodle.pupman-dot-com
> > Subject: Tank frequency
> > Date: Wednesday, October 09, 1996 12:25 AM
> > >From DavidF4797-at-aol-dot-comTue Oct  8 21:57:34 1996
> > Date: Tue, 8 Oct 1996 10:24:12 -0400
> > From: DavidF4797-at-aol-dot-com
> > To: tesla-at-poodle.pupman-dot-com
> > Subject: Tank frequency
> 
> > Second, I have heard the term "tank circuit" used to describe an LC
> circuit
> > for years and have never found anyone who knew what "tank" orriginally
> > referred to or why the circuit was blessed with this name...... it has
> been
> > suggested that the orriginal reference may be lost in antiquity.  Any
> > guesses?
> 
> Dave,
> 
> It is my guess that "tank" refers to a fixed volume of electrons at a given
> elasticity. The oscillations of the LC circuit attain resonance relative to
> the size of the tank. (tank=inductance x capacitance)
> 
> Think of a well-tuned speaker cabinet; the speaker cabinet becomes the tank
> in which the resonance occurs. The size of the speaker cabinet tank would
> be calculated by the volume of the cabinet (capacitance) times the air
> resistance/elasticity (inductance.)
> 
> I am guessing that If we know the value of the tank, we can determine its
> resonant frequency.
> 
> I would be interested in learning the formula for determining the resonant
> frequency of a given tank circuit. Any mathematicians out there?

Dave,

The formula for a single, uncoupled series LC circuit with negligible
series resistance can be approximated by:

    F = 1/(2*Pi*Sqrt(LC))  
        
        L in Henries
        C in Farads
        F in Hertz

It gets a little hairier when you add gaps, discharges, or coupling to
another coil..  :^)


-- Bert --