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Article #1523Re: Tingles from power supply
From: Eeyore
Date: Sun, 08 Mar 2009 19:40
Date: Sun, 08 Mar 2009 19:40
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1954 bytes
Sylvia Else wrote: > Sylvia Else wrote: > > I've recently bought a D-Link DIR-300 wireless router. While > > disconnecting its power supply from it, I got a tingling sensation when > > I touched the plug (to be clear, I'm talking about the 5V DC plug, not > > the mains plug). > > > > An AVO meter shows about 90V AC to earth from either side of the 5V > > plug. Short circuit current to earth is about 0.1mA. > > > > Still, I thought these things were meant to be completely isolated. Has > > there been a change of approach? > > Apparently it's normal, and is related to RFI suppression. 100% correct. It'll almost certainly be a Y2 cap between the live and secondary sides of the switching transformer. Go to powerint.com to find out why it's there. Graham
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X-Google-Thread: 112d1e,5985c699c60fb1f8 X-Google-Thread: 103407,5985c699c60fb1f8 X-Google-Attributes: gid112d1e,gid103407,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news2.google.com!news.glorb.com!news2.glorb.com!feeder.erje.net!news2.arglkargh.de!news.n-ix.net!newsfeed.freenet.de!newsfeed20.multikabel.net!multikabel.net!newsfeed10.multikabel.net!news.astraweb.com!border2.a.newsrouter.astraweb.com!not-for-mail Message-ID: <49B41F12.2E5FD4C6@hotmail.com> Date: Sun, 08 Mar 2009 19:40:02 +0000 From: Eeyore <rabbitsfriendsandrelations@hotmail.com> Organization: Eeyore's gloomy place X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: sci.electronics.design,aus.electronics Subject: Re: Tingles from power supply References: <00b89736$0$7237$c3e8da3@news.astraweb.com> <00b89aa6$0$7280$c3e8da3@news.astraweb.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 25 NNTP-Posting-Host: 70f7ed32.news.astraweb.com X-Trace: DXC=^<?igcWKA^F\kdljK^UWoEL?0kYOcDh@J]A]oW>I^V^Afj^HSLUZPUMYS`@2JBI2kKjad1;GlU1cL6DbJ56Sn94K