Capacitor Array on Power and Ground planes – How to Avoid Resonance?

[bear]

Personally, I would not apply a lockwasher to the surface of a PCB. First, I would coat the area with amount around the hole of solder, as thick as possible. If necessary you can use a file to make the surface flat.

typo there... "with an adequate amount of solder around the hole, as thick as possible" The purpose is to provide a thick enough surface for the lockwasher to grab without penetrating the PCB copper... once you penetrate, it has the tendency to rip up the copper and sometimes strip it off if the screw is removed. No need to have that happen...

 

[Max Headroom]

I have played with wrapping around the mains power cord with clip-on ferrites. I was extremely surprised that it did have an effect on my Blu Ray player - not a positive one but a negative one! It created a kind of nasty distortion that made the bass sound very weird. I had two audio friends with me at that time. One of them asked me to remove the clip-on ferrite and when I did the distortion in the bass was gone. That was easy to repeat and we confirmed that finding. Of course, although the perception was bass distortion, I believed it was higher frequency harmonics giving the perception of bass distortion

My experiences also.
Bass sounds wrong and nasty 'distortion' cast over the whole sound, causing harsh mids and highs in addition to boomy resonant bass.
I bought a Belkin PureAV power conditioner.
It does clean junk from the mains, BUT it adds that 'ferrite' sound.
It now lives on a shelf in the garage.

barkhausen.htm

Dan.

 

[HiFiNutNut]

Dan, No need to buy expensive power conditioner. I tried some commercial Corcom filters and they do work well. Look up the TE Connectivity site and download their Corcom datasheets. For an example, the 6EQ series would be good for anything including power amps.