Mains Noise Suppression

[jean-paul]

Originally Posted by Brian Oshman

Underground is much more reliable.

Tell that to the world (see post #20). Often is chosen for the cheapest solution by commercial operating power companies. Here (national anthem sounding in the background) the choice was made for a simply good solution in the past .... That is why I do not object against a government ruled power company that provides energy at cost without the need to make profits, give out stocks and pay high salaries to too many managers etc. A plain old fashioned government owned power company will provide labour for many and it will ensure timely maintenance and/or replacement of older cabling etc. Something that is not so sure with commercially driven companies with names changing faster than my eyes can winkle.

Not having hurricanes and tornados in this part of the world helps somewhat too.

[Pano]

Brain, thanks. Completely agree with your post #26. I was not precise with the terms.

J-P. Yeah, I was fond of the EDF (and SNCF) too.

[tinitus]

hey, I consulted my buddy

his magic word was spike killers or transient killers
specialised for mounting directly onto the main security board
he says the spikes is where the noise is "hiding"
insanely expencive small bastards
and he even talked about having 3 more in front of that

he also showed me different kinds of spike killers fore just about every incoming cable, from ordinary antenna and telephones to digital signals

and yeah, as mentioned previously, adaptors
seems the schuko plugs actually have a special "adapter hole", which matches the third pin with earthing on our local plugs

and if I want even better earthing/ground, another possibility is to use multiple earth/ground spears, about 6meters apart, all connected together

I might end up in a heavily shielded farraday cage

[marce]

On of the cheepest and easiest ways of stopping conducted noise at RF is to put a ferrite round your mains cables, if they havn't already got one. Its worth a try as they are so cheap.

[tinitus]

yes, I have mains wire to PC wrapped around a toroid, and it helps
Its just not good enough
a PC needs the earth leg connection, as pr Jean Pauls post

around here its usually the switchmode smps that goes first in a PC, and takes out the whole computer
I do have connectors with earth in the renovated area of my house
but many older installations were made before computers
everything was double isolated, thus only 2leg connectors
only washing rooms had earth connections
only newer installations are prepared for this new world

hey, I just figured how to get better sound
buy a ton of cheap earth leg adaptors, and hand them out free to every one who passes by
I need to check my neighbours

Originally Posted by jean-paul

All computer power supplies are designed with a noise filter in them so no need for an extra filter.
They do need safety earth/ground for filtering and safety. .

If you use any desktop computer unearthed you will not only have noise problems in for example your sound card but the computer will pollute the mains too because of its SMPS.

Please check up how mains filters work, they do need an earth/ground connection to loose the noise to.