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Article #1521

Re: Tingles from power supply

#1521
From: Archimedes' Lever
Date: Sun, 08 Mar 2009 17:09
49 lines
3275 bytes
On Mon, 09 Mar 2009 02:18:22 +1100, Sylvia Else
<sylvia@not.at.this.address> wrote:

>J.A. Legris wrote:
>> On Mar 8, 10:35 am, Sylvia Else <syl...@not.at.this.address> 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.
>> 
>> Just think, the only thing between you and the great beyond is a thin
>> layer of ceramic material, possibly contaminated with who-knows-what,
>> bearing a certification logo of dubious authenticity. It's time to
>> invest in some rubber-soled slippers.
>
>It's certainly not a happy thought. I will be treating the low voltage 
>side of such power supplies with more respect from now on.

  Please do us all a favor and latch on to the high side of one soon.
>
>BTW, I tried the same tests with the power supply for my cable modem. It 
>showed higher voltages, but lower current.


  You're a total retard, and you likely do not even know how to make such
measurements.

>
>But immediately after I'd unplugged it from the mains, I happened to 
>touch the mains plug pins with the palm of my hand, and got a 
>significant shock off it.

  Damn!  Obviously not significant enough!

> Reverse leakage through the rectifiers? But 
>why should there even be enough to feel?

  You're an idiot.  You don't even know what type of circuit the dongle
is constructed with.  You won't know either, until you pull out the
dremel tool, and stop guessing like the twit you are.
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From: Archimedes' Lever <OneBigLever@InfiniteSeries.Org>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Tingles from power supply
Organization: Archimedes'Palimpsest
Reply-To: My Assistant:  Zhang Heng
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