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Old 21st June 2004, 01:19 PM   #1
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Default Parallel mains filter or purifier info needed !

Hi to everybody,

I have read a lot of info about normal LC mains filters and their problems. I think a better solution is to use a parallel filter across the live and neutral.

What do you guys think about that?
How can that be calculated?

I have here one solution at this link:
http://www.tnt-audio.com/clinica/mains_e.html

Are there any other circuits out there?
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Old 21st June 2004, 01:24 PM   #2
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I think you are unaware of WHAT you are going to remove. L's are required when you need more effective filtering than only C's.
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Old 21st June 2004, 01:27 PM   #3
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Yeah but L´s in series with current can effect the devices connected after.
for instance dynamic loss by amplifiers.
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Old 21st June 2004, 01:41 PM   #4
DIAR is offline DIAR  Finland
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Have you heard about Auricap tweak:

http://didnt.doit.wisc.edu/audio/CDP/cdp.html

And here's mine:

http://kotiweb.kotiportti.fi/audiovideo/DIY/auricap/


The idea is to install 2 Auricap capacitors (0.47 uF) between neutral and hot. Auricap has been the best cap for the job. X2 or caps like that won't do...

I couldn't find any Auricaps in Finland so I had to settle with Arcotronics high quality (and high priced) Metallized Polypropylene capacitors.

You will find more info at http://www.audioasylum.com/audio/tweaks/bbs.html

I don't believe that a well designed filter with chokes in it will decrease dynamics. As long as components are chosen carefully and the L kept low, there won't be any problems.

I'm going to build a kick *** filter but there's still a lot of designing to do. Here's an unfinished scheme :


Click the image to open in full size.
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Old 21st June 2004, 01:46 PM   #5
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Quote:
Originally posted by promitheus
Yeah but L´s in series with current can effect the devices connected after.
for instance dynamic loss by amplifiers.
The thing with L's IS to smooth the currents! I think you are a bit wrong about the "dynamics" because this is dependant of the whole power supply.

The filters you are thinking about are made for > 1MHz but special filters can go from 100 kHz, or even lower.
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Old 21st June 2004, 01:51 PM   #6
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Quote:
Originally posted by DIAR
I'm going to build a kick *** filter but there's still a lot of designing to do.G]
Aren't your L's rather small? Normally you have 1 mH or more.
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Old 21st June 2004, 02:00 PM   #7
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For audio equipment the filters should start cutting from 200 Hz-1000 Hz. That means the inductors should be bigger the shoe boxes. 1 mH is nothing you need something like 100mH at 10-20 Ampreres if you don´t want the filters to effect power amps.

For small devices you can use a normal filter but the problem is to design a filter for the whole system.
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Old 21st June 2004, 02:03 PM   #8
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Don't take me as an experienced guru, I'm totally newbie with these devices. I have been designing this filter with a few finnish high end enthusiasts.

The whole idea is to keep the inductance very low. Here's a few PSpice simulation pics:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Can anybody give some advice how to proceed with this filter?
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Old 21st June 2004, 02:10 PM   #9
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By the way. This filter is designed for CDP and preamp. The values don't tell everything. I'm going to use iron powder toroids and other sophisticated components.

If the L is increased too much, the filter will limit current feed.

Here's another very popular filter design that can be bought from www.diycable.com if DIY is not an option:

http://www.geocities.com/jonrisch/surge.htm

http://mysite.verizon.net/vze22yzp/id11.html
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Old 21st June 2004, 02:11 PM   #10
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Quote:
Originally posted by promitheus
For audio equipment the filters should start cutting from 200 Hz-1000 Hz.
Are you really sure about that?
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