Anybody can identify that EMI filter? - diyAudio
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Old 27th January 2004, 01:31 AM   #1
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Default Anybody can identify that EMI filter?

I'm trying to source this type of EMI filter for my DAC. Any idea where I can find it? This one belongs to ML39 board.
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Old 27th January 2004, 02:02 AM   #2
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Multiple XY Capacitors? (Class X2 & Y2 together)
http://www.evox-rifa.com/cap_catalog/deltaemi/pzb300.pdf
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Old 27th January 2004, 02:47 AM   #3
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I don't think it's what you linked. What I'm looking for consists of two inductors shunted by a cap.

Digi-Key carries similar product http://dkc3.digikey.com/PDF/C041/0705.pdf
with frequency ranging from 10 to 60MHz. Any recommendation which value is most suitable for a DAC circuit?
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Old 27th January 2004, 03:24 AM   #4
Cobra2 is offline Cobra2  Norway
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PerAnders have used these in some of his projects...:
http://home8.swipnet.se/~w-80046/hif...0schema_p2.pdf
(PSU for RIAA)
http://home.swipnet.se/~w-50719/hifi/qsxm3/index.html

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Old 27th January 2004, 03:48 AM   #5
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Default Part made by LittelFuse

The logo of the part: LF seems to indicate that is a part made by LittelFuse, probably a Feedthrough EMI Filter, probably L-C-L configuration. The 103 is probably the Capacitor value or 0.01uF.
It is probably an obsolete part. Just a suggestion...

Bye...

SB
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Old 2nd February 2004, 11:20 AM   #6
hjelm is offline hjelm  Sweden
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I thimk it is a MuRata EMI filter EMIFIL

Click the image to open in full size.

It is a L C L filter but i only know where to get it in sweden.
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Old 2nd February 2004, 11:37 AM   #7
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Peter,

I have two of those, but labelled 102 instead of 105. They are sold
as EMI filter DSS306 EMIFIL. Built up from two ferrite beads and
a 1000pF ceramic cap, to be used for filtering out the range
1 - 1000 MHz. If you google for those, you will probably find the
other variants too. Hope it can help you to find them.
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Old 2nd February 2004, 02:00 PM   #8
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Thanks guys, it definitely looks like Murata. I knew that sooner or later the correct answer would pop up.
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Old 2nd February 2004, 02:37 PM   #9
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And this is the pic for those who rightly claim that ML gear is parts farm
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Old 2nd February 2004, 02:50 PM   #10
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Peter you are looking for a plain "MuRata"-filter. Notice that they more or less demands groundplane in order to get low inductance in the center pin. This is very important if you want out the most of the filter.
You can see the filters behind the big blue caps, small brown things. Note also that I have groundplane so the filters have good working conditions.

http://home5.swipnet.se/~w-50674/hif.../qsxm3_top.jpg

They can be bought here, also worldwide.
http://www.elfa.se/elfa/produkter/se/2012678.htm
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