copper pipe for air core shields? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th September 2009, 04:31 PM   #1
sendler is offline sendler  United States
diyAudio Member
 
Join Date: Aug 2004
Location: ny
Default 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?
__________________
Scott
  Reply With Quote
Old 30th September 2009, 04:34 PM   #2
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Quote:
Originally Posted by sendler View Post
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
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 30th September 2009, 05:06 PM   #3
diyAudio Member
 
Saturnus's Avatar
 
Join Date: Jun 2005
Location: Copenhagen, Denmark
Quote:
Originally Posted by Magura View Post
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.
  Reply With Quote
Old 30th September 2009, 05:28 PM   #4
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Quote:
Originally Posted by Saturnus View Post
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
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 30th September 2009, 05:33 PM   #5
sendler is offline sendler  United States
diyAudio Member
 
Join Date: Aug 2004
Location: ny
Default 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
__________________
Scott
  Reply With Quote
Old 30th September 2009, 05:40 PM   #6
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Quote:
Originally Posted by sendler View Post
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
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 1st October 2009, 06:44 AM   #7
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Copper coil inductor vs. round core inductor tomchaoda Pass Labs 7 21st September 2011 04:42 AM
FS:Copper Foil Air-Core Inductor 1.5mH - FREE SHIPPING! YFW Swap Meet 0 4th September 2008 01:52 PM
Pure Copper conductor deposited on a ferrous core?!?!? pjpoes Parts 10 5th July 2007 08:30 AM
DIY Surround Sound Speaker Stands - Copper Pipe thabenksta Everything Else 10 18th December 2004 08:31 PM
Erse indictors vs. Copper Foil Air Core Inductors? G Multi-Way 4 5th July 2004 12:45 AM


New To Site? Need Help?

All times are GMT. The time now is 06:37 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2