Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: Odd harmonic ringing?

Posted by audionutge@yahoo.com (M) on May 27, 2007 at 06:01:55

In Reply to: Odd harmonic ringing? posted by rick_m on May 26, 2007 at 18:34:07:

Rick...it's fairly simple...all noise is caused by frequency imbalance. The incoming service into your house is fairly clean. Noise, harmonics, Rf, or whatever you want to call it is caused by the appliances (including your stereo) that are plugged into the circuits of your house. Ringing harmonics are caused by the cap / choke filter in 99% of your electronic components. What we are talking about here is the leakage from the first shunt capacitor in each component. The ringing could be caused by a uf value mismatch between component A, B, and C...or it can be too many at the same value causing a overlap in frequency (very similar to a crossover effect for the ac line).

As I mentioned before, everything on the line effects frequency. Ferrite rods shift frequency. Harmonic ringing caused by the shift can be fine tuned by moving the rod up and down the cable. In this case you are not fixing the problem, but altering / shifting the problem to another less noticed frequency.

I have been playing / installing the choke in various products that I design for the last couple of years. I have run into problems many times when combining the choke with normal single cap parallel filtering or ferrite beads and rods. Multi-valued cap filtering on the other hand has offered a nice step forward when combined with the choke.

My best advice to you is to install one choke per component. The choke will remove the ringing and offer PFC for the isolated component. At the same time it will offer parallel filtering for the other components plugged into the same circuit.

regards
Alan Maher

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