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Re: Poormans power enhancer (possible answer)

205.162.100.130

Posted by Steve Eddy on June 18, 2000 at 15:31:19

In Reply to: Re: Poormans power enhancer (possible answer) posted by Triodethom on June 18, 2000 at 13:01:52:

triodethom wrote:

If the ac power in this case is a transmission line then the small amount of cap and the inductor produce a tank curcuit . Yes it will work because it becomes a sink for the out of band signal not desired ( every thing thats not 60 hz or 50 hz . ) A small amount if cap is what is required here for uses as a filter rather than as a power factor correction . Have you measured the values used on the base ?

An inductor and capacitor don't necessarily produce a tank circuit. They will produce a resonant circuit, but for it to be a tank circuit, the inductance and capacitance need to be in parallel (in other words, a parallel resonant circuit as opposed to a series resonant circuit).

And yes, if you placed a high Q tank circuit across the AC line with a resonant frequency of 60 Hz, it would indeed serve as a sink for any out of band frequencies (the cap serves as the sink for frequencies above the resonant frequency and the inductor serves as the sink for frequencies below the resonant frequency). And that might very well be what's going on inside the military units some have mentioned.

The only problem is that APM's tweak doesn't model as a parallel resonant circuit. It's a series resonant circuit. Drawn another way, APM's circuit looks like this:

Basically it's the equivalent of wiring a small value capacitor across the AC line. However the frequency of self-resonance would be a bit different than if you were to use a more practical capacitor due to the higher than usual inductance of the capacitor's leads (in this case the zip cord serves as both the leads and the plates of the capacitor).

For a tank circuit, it would need to look like this:

So perhaps it was a tank circuit that APM was shooting for initially but something got lost in the translation.

se

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