🚀 go-pugleaf

On Wed, 11 Mar 2009 22:26:29 -0800, Robert Baer <robertbaer@localnet.com>
wrote:

>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.

 That depends on their size, and after they get too big to hang on the
outlet, they become in-line units that lie on the floor.

  ANY supply fed by a std IEC power cord has them, I can practically
guarantee it.  Nearly all of those are switchers too.

  Nearly any from a major maker like Sony does.

   Yes, most outlet hung devices do not have said filtration, and most
are not switchers either... but a few are.