DIY Mains Cleaner/Filter

dynoPort · 18th November 2004, 08:21 PM

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 · 23rd November 2004, 09:03 AM

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

dynoPort · 23rd November 2004, 09:34 AM

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

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

DIAR · 23rd November 2004, 12:59 PM

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.

18th November 2004, 08:21 PM	#1
dynoPort diyAudio Member Join Date: Oct 2004 Location: Cymru/Wales	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.

23rd November 2004, 09:34 AM	#3
dynoPort diyAudio Member Join Date: Oct 2004 Location: Cymru/Wales	I'm thinking of doing something like this... http://www.triode-systems.com/diy_filter_easy.htm __________________ WANTED: Creek Destiny POWER amplifier

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23rd November 2004, 09:03 AM	#2
DIAR diyAudio Member Join Date: Jun 2004 Location: Capital City Area	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

23rd November 2004, 12:59 PM	#4
DIAR diyAudio Member Join Date: Jun 2004 Location: Capital City Area	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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