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On Wed, Jul 25, 2007 at 10:58:07AM +0300, Sampo Savolainen wrote:
It's a laptop.
We're talking about 19VDC here. IANAEE, but I imagine that the $20 laptop power supply will sacrifice its life in case of lightning strike, horrible mains power fault, surge, or other disaster, leaving both the laptop and the performer intact.
Up until this year, I've never seen a laptop power supply with a ground pin anyway, at least here in the USA. They've all been two-pin AC, no ground. I've never had any kind of dangerous problem with them, in nearly over 15 years of using laptops. The grounding of laptop power supplies is a new thing.
Finally, I always run all my stuff off of a multi-outlet strip with a breaker. That thing is supposed to give its life as well too.
There is no other solution. I've been told that the buzz/ground problem is *inside* the laptop and all of them have it. It's a cost-saving and space-saving measure that the PCB designers make.
I also need to point out that changing audio interfaces did not eliminate or even mitigate the buzz, and, I'm told could not have done so. I heard the buzz with USB and firewire interfaces.
I suppose if one is really safety counscious, one could run the laptop off of its battery. However, running out of battery in the middle of a show, is, um, disconcerting.
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