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Article #1285Re: Tingles from power supply
From: Robert Baer
Date: Wed, 11 Mar 2009 02:16
Date: Wed, 11 Mar 2009 02:16
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2288 bytes
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? > > Sylvia. Sounds line that wall wart is a transformer rather than a switcher supply. A bit messy adding a ground line which shoud connect to the transformer laminations.
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