Common mode choke

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Common mode choke

Post by terkio » Sun Mar 31, 2019 8:18 am

This is to use at the inputs of a mic preamp, for -hopefully- CMRR enhancement.
Is this, good ?
It is not specified as a CMC, but it has 1:1 turn ratio, is small, is specified over 20Hz 50KHz
I was unable to find Common Mode Chokes, clearly made for audio.
All, I have found are for power supply lines and do not specify anything about audio. Those on ferrite -a magnetic circuit far from linear-, are lickely when used on audio signals, THD killers.
Could be I missed the right stuff, where is it ?

EDIT From Triad Magnetics too, could this CMC for power lines, be good for audio ?
A 10mH choke. ... 154072.pdf

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Re: Common mode choke

Post by mediatechnology » Sun Mar 31, 2019 8:51 am

There's a thread here: viewtopic.php?f=6&t=490

Have a look at these:

Coiltronics VersaPac Inductors ... uctors.pdf

Coiltronics VersaPac VP2H

or these:

Coilcraft "Tip and Ring" Common Mode Chokes ... Chokes.pdf

I think I have samples of both and may have discussed these in the Line Input thread.

I used the Tip and Ring choke in the Heathkit IG-18 to quieten the switching power supply.

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