Path: utzoo!utgpu!attcan!uunet!wucs1!jps From: jps@wucs1.wustl.edu (James Sterbenz) Newsgroups: sci.electronics Subject: Re: need help to reduce a monitor's squeal Message-ID: <339@wucs1.wustl.edu> Date: 28 Sep 88 20:49:21 GMT References: <716@pedsga.UUCP> Reply-To: jps@wucs1.UUCP (James Sterbenz) Organization: Washington University, St. Louis, MO Lines: 27 In article <716@pedsga.UUCP> jeffj@pedsga.UUCP writes: >I have a question worthy of the net's collective wisdom. >My hearing extends into the high frequency end (>15kHz). >I can hear several terminals and televisions 'squeal'. >I understand that this is the flyback transformer at the scan frequency. >Is there anything I can do to attentuate the squeal? >How about a coating on the transformer? Inside the cabinet? I've got the same problem, and with TV monitors, as well. Last time I tested, I could hear above 23KHz. While using one particular set of terminals I had to use ear plugs. If you have to resort to this, try using the little foam cylindrical ones. Thery're very comfortable. Now, I just use a portable CD, which seems to mask most of the noise (and monitors seem to be getting better, in general, and I suppose I'm starting to lose high frequency response with age). BTW, who ever thought that 22.04KHz frequency response was adequate for CD's? -- James Sterbenz Computer and Communications Research Center Washington University in St. Louis 314-726-4203 INTERNET: jps@wucs1.wustl.edu UUCP: wucs1!jps@uunet.uu.net