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Old 5th July 2010, 11:01 PM   #1
phrarod is offline phrarod  United States
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Default 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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Old 6th July 2010, 12:52 AM   #2
tinitus is offline tinitus  Europe
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only mu-metal I have ever seen

Ultraperm MUMetal Shielding Sheet 0.15mm, 31.5cm x 19.5cm 80% nickel | Diy HiFi Supply
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Old 6th July 2010, 12:54 AM   #3
phrarod is offline phrarod  United States
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I have sheeting but its not as good as a can unfortunately.
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Old 6th July 2010, 01:11 AM   #4
jcx is online now jcx  United States
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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
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Old 6th July 2010, 02:28 AM   #5
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Quote:
Originally Posted by phrarod View Post
I have sheeting but its not as good as a can unfortunately.
You wanna demonstrate that with some data?
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Old 6th July 2010, 02:32 AM   #6
phrarod is offline phrarod  United States
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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.
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Old 6th July 2010, 03:26 AM   #7
max426 is offline max426  United States
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Quote:
Originally Posted by phrarod View Post
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

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Old 6th July 2010, 03:27 AM   #8
phrarod is offline phrarod  United States
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Thanks. I'll check it now.
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Old 6th July 2010, 12:23 PM   #9
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Quote:
Originally Posted by phrarod View Post
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.
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Old 6th July 2010, 02:37 PM   #10
phrarod is offline phrarod  United States
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I have not tried that but would love to try those sniffers. Are they expensive?
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