copper pipe for air core shields?

[sendler]

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]

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]

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]

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]

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/showthread.php?p=1228778
http://diyparadise.com/charlize2.html

 

[Magura]

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]

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