Re: AC resonance circuit with DC electrolytic capacitors? (resonating, reson...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: FIFTYGUY@xxxxxxx 

In a message dated 3/10/07 11:52:18 P.M. Eastern Standard Time, 
tesla@xxxxxxxxxx writes:

>Not really.  As the lamp filament heats and cools, it causes filament
>resistance to change, which slightly changes the resonant frequency of the
>RLC circuit,

    Does changing the "R" in an RLC circuit change the resonant 
frequency? Or just the Q?
    I'm guessing a dim bulb filament has low resistance, which 
*allows* the resonance to increase the current until the filament 
starts glowing. The filament glows until enough energy has dissipated 
from the LC tank that the resonant current drops. When the current 
drops, the light dims again.
    I guess the trick is using an L and C large enough to store 
enough energy so that an equilibrium of a "half-dim" bulb isn't 
reached with a particular bulb?

-Phil LaBudde





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