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Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!helios.ee.lbl.gov!pasteur!ames!xanth!ukma!tut.cis.ohio-state.edu!osu-cis!att!ihlpl!knudsen
From: knudsen@ihlpl.ATT.COM (Knudsen)
Newsgroups: sci.physics,sci.electronics
Subject: Re: Audible effects in solid-state electronics
Summary: Me too
Keywords: VAX FPA CD
Message-ID: <8650@ihlpl.ATT.COM>
Date: 25 Jan 89 19:25:56 GMT
References: <9359@nsc.nsc.com>
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 14

A year ago I was using a Sun 3/xx workstation, and it seemed like
I could hear the pixels hitting the raster!  Turned out I heard
the same sizzling squeaky sounds during non-graphic but CPU-intensive
tasks like C compiles and nroffs.  So the sound must have been coming
from the CPU, RAM, or associated glue logic (all TTL I'd think,
for the glue).  Some folks thought I was nuts, others could hear it.

I now have a Sun 3/50 with color monitor, and can't hear it.

BTW, I don't think we're talking about switching power supply noises;
I doubt any CD player would use these.
-- 
Mike Knudsen  Bell Labs(AT&T)   att!ihlpl!knudsen
"Five hundred twelve K bytes of RAM ... out of control ... "