Need to source Mu-metal cans

phrarod · 5th July 2010, 11:01 PM

I'm having some interstage transformers made but the manufacturer doesn't have any access to mu-metal cans.

Anyone know where I could find cans roughly 2.25" D x 1.75" H

tinitus · 6th July 2010, 12:52 AM

only mu-metal I have ever seen

Ultraperm MUMetal Shielding Sheet 0.15mm, 31.5cm x 19.5cm 80% nickel | Diy HiFi Supply

phrarod · 6th July 2010, 12:54 AM

I have sheeting but its not as good as a can unfortunately.

jcx · 6th July 2010, 01:11 AM

low carbon steel is lower perm but much cheaper, more available, formable - use a couple iron cans nested with air-space

if its hum you're trying to attenuate then a iron box around the supplies might be a good start

jackinnj · 6th July 2010, 02:28 AM

Quote:

Originally Posted by phrarod

I have sheeting but its not as good as a can unfortunately.

You wanna demonstrate that with some data?

phrarod · 6th July 2010, 02:32 AM

only real world experience. I would have to somehow weld it into a can shape. Wrapping the transformers did next to nothing. This is why mu-metal cans are used in these applications - Jensen, Audio Note, on and on. Wish I could get away with just mu-metal sheeting. Would make things easier.

max426 · 6th July 2010, 03:26 AM

Quote:

Originally Posted by phrarod

I'm having some interstage transformers made but the manufacturer doesn't have any access to mu-metal cans.

Anyone know where I could find cans roughly 2.25" D x 1.75" H

Check this link. Download the PDF catalog

ZERO Manufacturing, Inc. - Deep Drawn Enclosures

jim

phrarod · 6th July 2010, 03:27 AM

Thanks. I'll check it now.

jackinnj · 6th July 2010, 12:23 PM

Quote:

Originally Posted by phrarod

only real world experience. I would have to somehow weld it into a can shape. Wrapping the transformers did next to nothing. This is why mu-metal cans are used in these applications - Jensen, Audio Note, on and on. Wish I could get away with just mu-metal sheeting. Would make things easier.

Which mu-Shield foil are you using? You can wrap several layers on a former, insulated from the transformer. Separate each layer (you can use mylar tape) I've had very good luck with MuShield.

Have you identified the source of the radiation? Perhaps changed the orientation of the source? Shielded the source with absorptive material. I have an EMI sniffer which will pick up line radiation and an RFI sniffer -- in particular, the EMI sniffer can be hooked up to a selective voltmeter (I have it on a HP Spectrum Analyzer) and you can pinpoint the source of the radiation.

phrarod · 6th July 2010, 02:37 PM

I have not tried that but would love to try those sniffers. Are they expensive?

5th July 2010, 11:01 PM	#1
phrarod diyAudio Member Join Date: Aug 2005	Need to source Mu-metal cans I'm having some interstage transformers made but the manufacturer doesn't have any access to mu-metal cans. Anyone know where I could find cans roughly 2.25" D x 1.75" H

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6th July 2010, 12:52 AM	#2
tinitus diyAudio Moderator Join Date: Nov 2005	only mu-metal I have ever seen Ultraperm MUMetal Shielding Sheet 0.15mm, 31.5cm x 19.5cm 80% nickel \| Diy HiFi Supply

6th July 2010, 12:54 AM	#3
phrarod diyAudio Member Join Date: Aug 2005	I have sheeting but its not as good as a can unfortunately.

6th July 2010, 01:11 AM	#4
jcx diyAudio Member Join Date: Feb 2003 Location: ..	low carbon steel is lower perm but much cheaper, more available, formable - use a couple iron cans nested with air-space if its hum you're trying to attenuate then a iron box around the supplies might be a good start

6th July 2010, 02:32 AM	#6
phrarod diyAudio Member Join Date: Aug 2005	only real world experience. I would have to somehow weld it into a can shape. Wrapping the transformers did next to nothing. This is why mu-metal cans are used in these applications - Jensen, Audio Note, on and on. Wish I could get away with just mu-metal sheeting. Would make things easier.

6th July 2010, 03:27 AM	#8
phrarod diyAudio Member Join Date: Aug 2005	Thanks. I'll check it now.

6th July 2010, 02:37 PM	#10
phrarod diyAudio Member Join Date: Aug 2005	I have not tried that but would love to try those sniffers. Are they expensive?

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