- Messages sorted by: [ date ][ thread ][ subject ][ author ]
- Next message: Jerry Kaidor: "Re: Yet more re: hum and power supplies"
- Previous message: David Rollo: "Re: upgrade to 256MB for D/NS Professional 3.0?"
- Maybe in reply to: John M. Goodman: "Yet more re: hum and power supplies"
directory. Usual disclaimers apply. Good luck.
Cheers
Andrea
This was created using speech recognition software. Apologies for any odd words
or phrases I may have missed.
Swales Tony Ext wrote:
> Hi Dror,
> 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.
>
> ----------
> >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.
