Re: Non-Linear Coil Winding Experiment. (and more tests!)
---------- Forwarded message ----------
Date: Fri, 17 Oct 1997 07:48:01 -0700
From: Jim Lux <jimlux-at-earthlink-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Non-Linear Coil Winding Experiment. (and more tests!)
> Fo = 1/[2*pi*SQRT(10^(-13) - 2500/0.0004)] = 0 - 0.00006366i
> Can you clarify this equation? It isn't making sense to me.
> The R^2/4L^2 part must be different???
> Ahhh...... perhaps you meant the frequency of a decaying impulse response
> a coil.
> Fo = SQRT(1/LC-(R/2L)^2)/(2*pi) This equation is correct only for an
> impulse response (capacitive discharge).
Nope, the original author is correct. The resonant frequency of a loaded
tuned circuit is in fact sqrt(1/LC-(R/2L)**2). This is part of the
solution of the differential equation for the circuit. In fact, the
voltage (or current) has a damped sinusoid appearance when the circuit is
hit by a transient (impulse or step).