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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Fitting Ferrites for noise controlPosted by JOHNR on: 12/4/2015
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Romy and Clarke
A couple of tips here:
To be truly effective, you need at least 3 turns of L+N through the ferrite; more if you can.
The "Y" network can be placed either side depending upon where the PP3000 to PP3000 interference is coming from.
You may need one each side.
In really bad situations, you may need to use two different ferrite types.
A ferrite with "Y" cap will give you 12dB whilst a second pair will give 18dB after that, it is a waste of money.
The discussions to date have been about finding and treating high frequency noise and not about PFC correction as such.
One interesting fact that has been discovered about commercial SMPS unit is that the regulations require a 1 meg ohm resistor to discharge the "X" caps when the plug is pulled out. The cap has no direct discharge path. Changing this resistor can change the sound. How? I don't know.
Regards
John
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