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In Reply to: RE: A question about power regenerators posted by tweakmenow on August 05, 2020 at 18:59:57
No criticism, it is a good experiment but it gets much more complicated from here.
Coupling of RF noise can be conducted or radiated. Without hunting it down, the noise could have gone airborne straight from your noise source to your measuring device since they were physically adjacent. No way to tell what the emission and shielding characteristics of each were in this example. The output of the regenerator could have been clean as a whistle (or not).
Various shielding experiments would have needed to be done to determine the exact path of noise conduction.
Mike
Follow Ups:
Testing procedure:
1) Noisy switching ps was powered by a true sine wave inverter, which is powered by a 12v battery, and super caps. Totally "off grid".
2) Entech Noise Analyzer placed one foot away from switching ps. Powered from house grid.
3) Entech set at reading of "100".
4) Switching ps energized. No change in Entech reading.
5) Entech moved to six inches away from ps. Noise reading "125".
6) Enteck touching ps. Noise reading of "150".
Based upon the above test, I can conclude that noise does indeed pass from input to output of the PurePower 1500.
That was my experience with the PP1050.When my refrigerator turned on I heard a click through the speakers.
Could not possibly be isolated from other AC sources.
Edits: 08/23/20
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Good experiment.
So you are saying that your original experiment with the regenerator would coordinate with 4 above? Specifically, that the Entech was physically far enough from the noisy SMPS that there would have been no airborne RF noise coupling.
I am surprised that the regenerator did not have incoming low pass filters. Doesn't seem like that would be terribly costly, parts-wise, for such a device.
I use a Topaz isolation transformer and it works really well in my home / system. Output is balanced AC with an independent ground wire to cold water pipe (same as breaker box). I have an additional small iso transformer, with noise filtering, connected to my balanced AC power, that feeds my DVD player. DVD power is completely disconnected if I am spinning vinyl.
Mike
Yes, the original test the switching ps was way more than one foot away.
I also am running "balanced" power, via a single Isoclean PT-3030GII. Better than regen units that I had tried. (PS Audio & PurePower)
Amp is straight to wall. Source is on the above mentioned inverter.
I am very happy with the sound, and that is all that matters.
My 400va Isolation Transformer also providess 'balanced' power and really helps.
Too much is never enough
Mike, I agree with you on this. Good point...
I still have the exact switching power supply. I will devise a test to see if airborne is part of the equation. Will post results here soon.
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