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Article #2247Re: Source of ripple in simple PS circuit?
From: Dave M.
Date: Wed, 21 May 2003 03:39
Date: Wed, 21 May 2003 03:39
31 lines
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2818 bytes
DaveC <dave+usenet3016@mailblocks.net> wrote in message news:0001HW.BAEF0876000FF444F0386600@news.cis.dfn.de... > Replaced the rectifier bridge. Hum is gone (well, 90 percent of it). What > remains is a quiet buzz that you can hear only if you put your ear to the > speaker. I think all commercial-grade stereos have some buzz in the output. > > I suspect that the bridge was under-designed. The current throught the +15 > volt circuit is about 1A. The bridge is rated at that. The fuses (between the > transformer and the bridge) were designed to be 2A (as silk screened on the > PCB); 3A fuses were found installed. Makes you wonder... > > Unit is an H-K model AVR 65. > > Some ripple (a few tenths of a volt p-p) remains, but the v. reg is > responding well and is able to suppress it. > > Thanks to all who contributed suggestions, Dave, Sometimes the low hum can be caused by a small filter cap in the preamp(s). I had that in a Scott reciever. > -- > Dave C > dave+usenet3016@mailblocks.net >
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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: 2003-05-20 20:39:09 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!peer1.news.newnet.co.uk!peer1.news.newnet.co.uk!news-xfer.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$OB5.464467@news4.srv.hcvlny.cv.net> <0001HW.BAEE339B0002EF2BF0386600@news.cis.dfn.de> <Ybhya.288$e_3.7@news02.roc.ny.frontiernet.net> <0001HW.BAEF0876000FF444F0386600@news.cis.dfn.de> 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: <wxCya.8583$Xj4.4192@news01.roc.ny.frontiernet.net> X-Trace: MzMgTm9BdXRoVXNlciBGcsBudGnKck5ldC1yZWFkZXJzIDIwOC4xOJkuNjAuMTg2ICBXZcssIDIx!IE1heSCdMDAzIDAzOjM5OjA4IEdNVA== 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: Wed, 21 May 2003 03:39:08 GMT Date: Wed, 21 May 2003 03:39:08 GMT