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From: woolsey@nsc.nsc.com (Jeff Woolsey)
Newsgroups: sci.physics,sci.electronics
Subject: Audible effects in solid-state electronics
Keywords: VAX FPA CD
Message-ID: <9359@nsc.nsc.com>
Date: 24 Jan 89 05:52:05 GMT
Organization: National Semiconductor, Sunnyvale
Lines: 15

I'm sitting here listening to my CD player being listened to by someone 
else, and find that the noise it makes (sounds like the disc sliding
on something) is not present between tracks, yet the disk still spins.
It occurs to me that this noise is also present in the FPA on Vaxen.
It's a sort of hissing sound.

So, is there any validity to the theory that certain logic families
exhibit piezoelectric effects when operating?

Am I rediscovering some fundamental physics here?
-- 
-- 
When it comes to humility, I'm the greatest.  -- Bullwinkle J. Moose

Jeff Woolsey  woolsey@nsc.NSC.COM  -or-  woolsey@umn-cs.cs.umn.EDU