Propeller Head Plaza

Why bother?

64.13.14.96

In Reply to: RE: Let's reverse-engineer the PS Audio Noise Harvester posted by tomsyl1 on June 02, 2008 at 18:16:47

If you nose around, probably on tweakers, Al Sekela has a filter design (mind you I've not tried it) that I think consists of three RC series networks across the line, each with different sized capacitors. Each RC works up to the self resonant frequency of it's capacitor. His notion is that it de-Q's the various resonances of your household power system. Now this is differential, not common mode.

IMHO, Al's scheme makes a lot of sense, it's better to dissipate the unwanted energy than to just bounce it around. I suppose an LED could be fitted but you should be able to see what's happening easily with your scope. Just hook up both channels to the line using a 10X probe to each side and use A-B. Most differential energy is under 10MHz. Intercepted RF is usually common mode.

I do think the LED's are clever marketing. Something to tout and probably keeps them out in the field even if the end user doesn't notice any improvement in their systems. "Wow, look at that baby flash, boy is this line noisy. I'd better buy some more, I've got a real problem."

Rick

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