[sdiy] Noisy transformers and faraday cages

[harrybissell at copper.net]

The Mu Metal should go in a complete unbroken
turn around the transformer. The idea is that the magnetic
field is concentrated in the shield and converted to heat by
eddy-currents.
They need a complete path. Mu-Metal gives the escaped flux a
perferred path to follow, rather than through your wiring.
A box over the top will have limited value.

H^) harry

>
>
>
>---- Original Message ----
>From: jmahoney at gate.net
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] Noisy transformers and faraday cages
>Date: Fri, 11 May 2007 11:56:48 -0400
>
>>At 11:05 AM 5/11/2007, Altitude wrote:
>>
>>>Ahh, McMaster-Carr, DIY dream warehouse.. (and the best online
>store I have
>>>EVER seen..
>>
>>Really! The selection is amazing and the website is excellent
>(except 
>>that it's hard to save direct links to specific products). The only 
>>thing to really complain about is the pricing, which can be high. If
>
>>you've got no other source for something, though, McMaster has 
>>usually got you covered.
>>
>>The website's drill-down product selector is great. When we wanted 
>>some rubber sheeting for a kitchen countertop, I easily found an 
>>FDA-approved, self-adhesive product that worked great. (It's called 
>>Buna-N rubber, for those keeping track. ;-)  If nothing else, you
>can 
>>use the site to learn about what's available, such as different
>types 
>>and qualities of rubber, plastic, metal, and so on.
>>
>>
>>>So the MU metal should just be fashioned into a cage around the
>transformer
>>>and grounded to case?
>>
>>I'd like to know, myself.
>>--
>>john
>>
>>
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>>
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