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Article #2250Re: Source of ripple in simple PS circuit?
From: Dave M.
Date: Tue, 20 May 2003 03:18
Date: Tue, 20 May 2003 03:18
31 lines
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2674 bytes
George R. Gonzalez <grg@umn.edu> wrote in message news:babdim$38p$1@lenny.tc.umn.edu... > Wait a minute---- you said there's no hum on the headphones! > > That's a really big clue... > > If there's no hum on the headphones, then it's unlikely the power amp itself > is making the hum. Often there are 220 ohm resistors in series with each headphone channel, when the headphone circuit is connected to the power amp output.. That tends to reduce noise and hum levels to virtual inaudibility. > > There may be a ground-loop problem with your speaker wiring. > > Are you sure the speaker wires are all done right--? i.e. two wires > running to each speaker, neither one connected intentionally or otherwise to > ground. > > Also, this may sound silly, but does the hum go away when you turn off the > amplifier power? If it doesnt go away, then you have hum pickup in the > speaker wires most likely. Move that arc-welder farther away from the > wires. > > >
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,80288951613ef33a X-Google-Attributes: gid112d1e,public X-Google-Thread: 103407,80288951613ef33a X-Google-Attributes: gid103407,public X-Google-Thread: 10d137,80288951613ef33a X-Google-Attributes: gid10d137,public X-Google-Thread: 1131b0,80288951613ef33a X-Google-Attributes: gid1131b0,public X-Google-ArrivalTime: 2003-05-19 20:18:19 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!nntp.cs.ubc.ca!nntp-relay.ihug.net!ihug.co.nz!west.cox.net!east.cox.net!peer02.cox.net!cox.net!news-feed01.roc.ny.frontiernet.net!nntp.frontiernet.net!news01.roc.ny.frontiernet.net.POSTED!not-for-mail From: "Dave M." <gadget@frontiernet.net> Newsgroups: sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair References: <0001HW.BAEDC6B30001868DF0386600@news.cis.dfn.de> <3R3ya.2176$OB5.464467@news4.srv.hcvlny.cv.net> <0001HW.BAEE339B0002EF2BF0386600@news.cis.dfn.de> <babdim$38p$1@lenny.tc.umn.edu> Subject: Re: Source of ripple in simple PS circuit? Lines: 33 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2615.200 X-MIMEOLE: Produced By Microsoft MimeOLE V5.00.2615.200 Message-ID: <Z7hya.8438$Ws6.1992@news01.roc.ny.frontiernet.net> X-Trace: MzMgTsBBdXRoVXNlciBGcm9udGllcitldC1yZWFkZXJzIDIwOC4xODYuNjAuMTg2ICBUdWUsIDIw!IE1heSAyMDAzIDAzOp44OjGYIEdNVA== X-Abuse-Info: Please be sure to forward a copy of ALL headers otherwise we will be unable to process your complaint properly X-Complaints-To: abuse-news@frontiernet.net NNTP-Posting-Date: Tue, 20 May 2003 03:18:17 GMT Date: Tue, 20 May 2003 03:18:18 GMT