Re: [OT] USB, electronics and ground

[Lehane Kellett <lehane@xxxxxxxxxxxxxxxxxxx>]

Often devices that are supplied by wall warts or bricks are not at
earth
potential and can be floating several volts above ground.

Lehane


Tim Hawes wrote:
> Just thinking aloud...
> Does your UPS have a plain filtered outlet i.e. one that is not
battery-backed?
> Maybe if you connect the other devices to that it would give them all
> the same earth potential?
>
> HTH,
>
> Tim.
>
> On 9/6/06, Paul Gale <groups@xxxxxxx> wrote:
>
>> I seem to have a problem with ground or earthing here. When I plug
in USB devices to my main PC, I get small sparks between the shield and the
PC case. This sometimes causes the PC to hang (not surprisingly!). I guess
I have different ground signals between various kit????
>>
>> The PC is powered from an APC smart UPS and the other USB kit is
on a mixture of standard power strips and surge protected strips.
>>
>> Any ideas?
>>
>> Thanks,
>>
>> Paul.
>>
>
>
>
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