Xref: utzoo sci.physics:5677 sci.electronics:4828
Newsgroups: sci.physics,sci.electronics
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: Audible effects in solid-state electronics
Message-ID: <1989Jan25.054823.2166@utzoo.uucp>
Organization: U of Toronto Zoology
References: <9359@nsc.nsc.com>
Date: Wed, 25 Jan 89 05:48:23 GMT

In article <9359@nsc.nsc.com> woolsey@nsc.nsc.com (Jeff Woolsey) writes:
>...So, is there any validity to the theory that certain logic families
>exhibit piezoelectric effects when operating?

Much more probably you are rediscovering the fact that switching power
supplies can "sing" and the music :-) is load-dependent.  It's quite
noticeable on an Iris 4D when the graphics hardware fires up.
-- 
Allegedly heard aboard Mir: "A |     Henry Spencer at U of Toronto Zoology
toast to comrade Van Allen!!"  | uunet!attcan!utzoo!henry henry@zoo.toronto.edu