Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!wuarchive!psuvax1!psuvm!art100 From: ART100@psuvm.psu.edu (Andy Tefft) Newsgroups: comp.sys.apple2 Subject: Re: Monitor Noise...A solution, a guess. Message-ID: <91056.222331ART100@psuvm.psu.edu> Date: 26 Feb 91 03:23:31 GMT References: <9102252144.AA11110@apple.com> Organization: Penn State University Lines: 15 Ahh... power supplies have been known to squeal from time to time for various reasons. This is especially true with switching power supplies (and with these, the intensity and frequency of the squeal can vary depending on the load). Most CRT-type devices (tv's, monitors) whine at 16-20khz, too high for many adults to hear but very annoying to some (those who can tell whether or not a tv is on from the next room, for example), and at varying volume levels. Additionally, any electronic equipment could radiate enough to interfere with the operation of other electronic equipment. This is sometimes fun. My //e monitor causes an annoying whine on an AM radio, while my //c's does not. However, running certain programs on the //c causes little blips of various sounds on the radio. And sometimes when I'm on the modem the cordless phone kind of half-rings, sounding very odd. Brought to you by Super Global Mega Corp .com