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Article #2248Re: Source of ripple in simple PS circuit?
From: George R. Gonzalez
Date: Mon, 19 May 2003 20:07
Date: Mon, 19 May 2003 20:07
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Wait a minute---- you said there's no hum on the headphones! That's a really big clue... If there's no hum on the headphones, then it's unlikely the power amp itself is making the hum. There may be a ground-loop problem with your speaker wiring. Are you sure the speaker wires are all done right--? i.e. two wires running to each speaker, neither one connected intentionally or otherwise to ground. Also, this may sound silly, but does the hum go away when you turn off the amplifier power? If it doesnt go away, then you have hum pickup in the speaker wires most likely. Move that arc-welder farther away from the wires.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,80288951613ef33a X-Google-Attributes: gid112d1e,public X-Google-Thread: 1131b0,80288951613ef33a X-Google-Attributes: gid1131b0,public X-Google-Thread: 10d137,80288951613ef33a X-Google-Attributes: gid10d137,public X-Google-Thread: 103407,80288951613ef33a X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2003-05-19 13:07:50 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!lenny.tc.umn.edu!not-for-mail From: "George R. Gonzalez" <grg@umn.edu> Newsgroups: sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Source of ripple in simple PS circuit? Date: Mon, 19 May 2003 13:07:48 -0700 Organization: University of Minnesota, Twin Cities Campus Lines: 20 Message-ID: <babdim$38p$1@lenny.tc.umn.edu> References: <0001HW.BAEDC6B30001868DF0386600@news.cis.dfn.de> <3R3ya.2176$OB5.464467@news4.srv.hcvlny.cv.net> <0001HW.BAEE339B0002EF2BF0386600@news.cis.dfn.de> X-Trace: lenny.tc.umn.edu 1053374870 3353 160.94.172.8 (19 May 2003 20:07:50 GMT) X-Complaints-To: usenet@lenny.tc.umn.edu X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165