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-   -   copper pipe for air core shields? (http://www.diyaudio.com/forums/class-d/152742-copper-pipe-air-core-shields.html)

sendler 30th September 2009 04:31 PM

copper pipe for air core shields?
 
Ever try shielding your air core coil's class D EMI in copper pipe fittings or should I keep looking for mu metal cans?

Magura 30th September 2009 04:34 PM

Quote:

Originally Posted by sendler (Post 1938271)
Ever try shielding your air core coil's class D EMI in copper pipe fittings or should I keep looking for mu metal cans?

I don't know about mu metal cans, but a copper can will lower the inductance, of an air core inductor.

I have used a combination of copper and ferro-magnetic stainless steel for the job, to keep the inductance unchanged.

http://www.class-a-labs.com/induc1.html


Magura :)

Saturnus 30th September 2009 05:06 PM

Quote:

Originally Posted by Magura (Post 1938273)
I don't know about mu metal cans, but a copper can will lower the inductance, of an air core inductor.

I have used a combination of copper and ferro-magnetic stainless steel for the job, to keep the inductance unchanged.

Technically they aren't actually air-core inductors anymore then but under-cored inductors.

Magura 30th September 2009 05:28 PM

Quote:

Originally Posted by Saturnus (Post 1938307)
Technically they aren't actually air-core inductors anymore then but under-cored inductors.

That could be said about any air core in a box ;)


Magura :)

sendler 30th September 2009 05:33 PM

Some people put foil right on the coils.
 
So I guess placing foil right on the coils like this won't help.
http://www.diyaudio.com/forums/class-d/87490-trends-audio-ta-10-modding-potential-post1228778.html
http://diyparadise.com/charlize2.html

Magura 30th September 2009 05:40 PM

Quote:

Originally Posted by sendler (Post 1938334)
So I guess placing foil right on the coils like this won't help.
http://www.diyaudio.com/forums/showthread.php?p=1228778
http://diyparadise.com/charlize2.html

That's a different solution, as it does not short the inductor.

I would be skeptic to its shielding properties, as it's not sealed.

Give it a shot, and test it with a compass.

Magura :)

phase_accurate 1st October 2009 06:44 AM

It is always better to GUIDE a stray magnetic field instead of trying to SHIELD it. Look at the coils used within the UcD amps.

Regards

Charles


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