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Article #1246Re: Tingles from power supply
From: Robert Baer
Date: Thu, 12 Mar 2009 06:26
Date: Thu, 12 Mar 2009 06:26
28 lines
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2675 bytes
FunkyPunk FieldEffectTrollsistor wrote: > On Tue, 10 Mar 2009 18:16:41 -0800, Robert Baer <robertbaer@localnet.com> > 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. >> >> 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. > > > Also likely not to have a line filter incorporated at all as well. AFAIK wall warts never use line filters.
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