DIY Mains Cleaner/Filter

[dynoPort]

Anyone got a list of parts, diagram etc? This would be for 230-250v AC mains. The toroidal transformers in my power amps hum to varying degrees during the day, no obvious pattern. I use a dedicated mains spur with its own earth.

 

[DIAR]

Sound like a dc offset problem. I built this for myself:
http://home.swipnet.se/~w-50719/hifi/dct01/index.html

Here's a few pics of my unfinished filter (the module on the left is 1. stage filter)
http://kotiweb.kotiportti.fi/audiovideo/download/valmiit moduulit.jpg

http://www.hifilehti.fi/keskustelu/upfiles/41/Ec894480878.jpg


Check out these threads:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=37942&perpage=20&highlight=&pagenumber=1

http://www.diyaudio.com/forums/showthread.php?s=&threadid=2080&perpage=20&highlight=&pagenumber=4

 

[dynoPort]

I'm thinking of doing something like this...


http://www.triode-systems.com/diy_filter_easy.htm

 

[DIAR]

Those are filters are bad. They will probably restrict dynamics. You might wan't to read this article:
http://www.geocities.com/jonrisch/surge.htm

If you wan't to get rid of humming, try this (it tells all the tricks in the world):
http://www.psaudio.com/account/humbusters.asp
(you need to register to get in!)
The toroidal transformer of my power amp hums and I have tried all the tricks in the world but I haven't succeeded to remove humming. Luckily the amp has a lifetime gurantee and the manufacturer promised to change the trafo for free.

My point is that you might not be able to remove humming and I'm 99% sure that a power filter won't help at all.

Tip: Try putting a hair dryer to same outlet with the power amps and put it on half speed. If it is DC offset that is causing the humming this should make it worse.