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[RFI] buying a AC adapter

To: rfi@contesting.com
Subject: [RFI] buying a AC adapter
From: Aaron Kreider <aaron@campusactivism.org>
Date: Fri, 26 Apr 2013 19:29:47 -0400
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
What should I look for in an AC adapter for low RFI?
I know that switched adapters tend to be bad. However, I also used to have a bad linear adapter cause RFI directly to a shortwave radio that was plugged into it.
I'm looking for a new adapter for my router.  9V.  600ma.  center 
positive.  2.5 mm x 5.5 mm.
Are class 2 adapters mostly or entirely linear?  I looked at some 
adapters and they either say switching or class 2.
Are switched power supplies considering smaller than linear?

Thanks,

Aaron
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