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I have just measured my dell power supply and it is almost completely DC.
Certainly no periodic 60hz signal. I have to oscilloscope captures if you
are interested. Have you tried grounding a dell laptop and does it help?
I am now certain the signal is being caused internally by the dell. I have
no other connections to the PC that might otherwise cause a ground loop.
On a slightly different note. Now I am going to try loading Dragon NS
preferred onto my Dell which has already VV. Has anyone had any problems
doing this before.
Thanks.
Tony Swales.
Obviously this has nothing todo with my current employer, just me.
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>The problem has to do with the fact that the power supply of Dell does not
>had a ground connection.
>Maybe the problem isn't with the AC to DC conversion in the laptop power
>supply, but rather with the fact that when you are plugged in your laptop
>is connected to your electrical system's "ground." That can sometimes
>produce a "ground loop" (if some other spot in the system is also connected
>to "ground," for example a powered set of speakers). Ground loops are
>notorious for producing hum, since they are in effect large loop antennas
t>hat pick up the 60Hz AC electromagnetic fields from the power lines all
>around us.
- Next message: Nancy Gray: "Re: speako's and power supplies"
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- Maybe in reply to: John M. Goodman: "Yet more re: hum and power supplies"
- Next in thread: Andrea Fuller: "Re: Yet more re: hum and power supplies"
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