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Article #1288Re: Tingles from power supply
From: Robert Baer
Date: Wed, 11 Mar 2009 02:18
Date: Wed, 11 Mar 2009 02:18
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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? >> >> Sylvia. > > > Apparently it's normal, and is related to RFI suppression. > > Sylvia. RFI? Think not; that voltage is about half the line, and is from capacitave coupling from primary to secondary (if transformer type).
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