Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!hplabs!hpcc05!hpcc01!brooksp
From: brooksp@hpcc01.HP.COM (Peter Brooks)
Newsgroups: sci.electronics
Subject: Re: Whisiling power supply
Message-ID: <4450002@hpcc01.HP.COM>
Date: 20 Dec 90 19:46:57 GMT
References: <steveh.661527877@tasman>
Organization: HP Corp Computing & Services
Lines: 6

I trust you mean that the noise is acoustic.  This used to be
a problem in cheap TVs, and the problem was with loose
laminations in the flyback transformer.  considering a
switching supply is similar, you might want to start there.

Pete Brooks