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Old 18th November 2004, 09:21 PM   #1
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Question DIY Mains Cleaner/Filter

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.
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Old 23rd November 2004, 10:03 AM   #2
DIAR is offline DIAR  Finland
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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/audiovi...20moduulit.jpg

http://www.hifilehti.fi/keskustelu/u...c894480878.jpg


Check out these threads:
?? DIY PS Audio Humbuster

dc filter
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Old 23rd November 2004, 10:34 AM   #3
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I'm thinking of doing something like this...


http://www.triode-systems.com/diy_filter_easy.htm
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Old 23rd November 2004, 01:59 PM   #4
DIAR is offline DIAR  Finland
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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.
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