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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: Ah, the common mode noise!Posted by Romy the Cat on: 11/29/2015

Thanks, John, I sink it might be call common mode noise. My concern about calling it common mode noise derived from the fact that it is not normal megahertz common mode noise but artificially induced common mode. The PP3000 operate at around 30kHz sampling rate , it means that common mode noise will be injected at roughly the same frequency. My presumption was that the other PP3000 shall be able to filter out the own sampling rate by venture that the noise samples are not shorter then own samples, I am not sure if I am write but this is how I see it. Anyhow, if it is the common mode problem then indeed to put a good common mode choke would be effective way to deal with the problem. I would not go for shunting the side with caps and balding a differential filter as according to my experience a presence of any shunting cap on AC side damage more than helps.

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