Path: utzoo!attcan!telly!problem!compus!lethe!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!samsung!think.com!linus!nixbur!nixpbe!uqun05!uqun38!teb From: teb@uqun38.nixdorf.de (Tobias Brueck) Newsgroups: sci.electronics Subject: Re: Whisiling power supply Message-ID: Date: 20 Dec 90 11:40:25 GMT References: Sender: news@uqun05.nixdorf.de Distribution: sci Lines: 28 steveh@tasman.cc.utas.edu.au (Steven Howell) writes: > Does anyone have any ideas, why a power supply (SMPS) would >create such an irritating high pitch squeal. I thought The chopper may >require replacing, but being a major task, I thought I might get some >options first. > Thanks.... Steve h First you can try to fix the coil in the power-supply with a little bit nail-varnish or fix the screws from the coil . The sound come from the coil which works now like a loudspeaker . If it doesn't work , control and adjust the switching-frequency by resistor or capacitor . Hope that help . ***** Wish a merry x-mas and happy new year ****** ============================================================================= | Tobias Brueck | Siemens-Nixdorf-Informationssysteme AG | WI-FF-382 | | D-W-4790 Paderborn | Heinz-Nixdorf-Ring | Phone: inter-5251-10-5815 | | Federal Republic of Germany | Republique Federale d'Allemagne | ============================================================================= | europe: eunet : ..!unido!nixpbe!brueck.pad | brueck.pad@nixdorf.com... | | usa: usenet: ..!linus!nixbur!brueck.pad | | =============================================================================