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Re: [RFI] RF Proof Computer Speakers?

To: "RFI List" <rfi@contesting.com>
Subject: Re: [RFI] RF Proof Computer Speakers?
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 07 Dec 2005 23:19:41 -0600
List-post: <mailto:rfi@contesting.com>
On Wed, 7 Dec 2005 23:54:49 -0500, Martin, AA6E wrote:

>I've often had RFI on computer amp/speakers, but winding the Audio
>input on a ferrite core about 6-8 turns normally fixes them,

Yes. Virtually computer audio gear and sound cards have pin 1 
problems, which is the basic cause of the RFI,. and the mulit-turn 
ferrite choke is a pretty good fix.  The number of turns and the 
ferrite material depends on the frequency that is getting in. 

Jim Brown K9YC

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