Re: SPEAKERS NOISE!!

From: Jotenko (Jotenko_at_discussions.microsoft.com)
Date: 08/03/04 

Date: Tue, 3 Aug 2004 13:39:05 -0700

Francis and others thank you so much for your help..

It looks that the problem is (I don't remember the name now)---> where we plug in the device's electricity cord.... In my case, those who are close to a phone line, have that problem..

I've already changed my pc location, so everything is fine now... I'm to tired of this damn pc, I won't even bother looking for the problem..

-------
PORTUGAL!

"francis gérard" wrote:

>
> "Jotenko" <Jotenko@discussions.microsoft.com> wrote in message
> news:DC53607F-8D47-42A1-A2B8-FFCB302472C8@microsoft.com...
> > Hey...
> >
> > This is more a hardware problem, but I hope you guys help me...
> >
> > As everybody, I have a monitor and stereo speakers, both plugged to the
> > electricity..
>
> just to be clear on this, the speakers (amplified i'm assuming), are
> emitting electrical noise ONLY when the monitor is plugged-in/turned ON,
> even if the speakers are not connected to the computer's sound system? and
> you say that this problem began 'recently'... if everything was OK before,
> then obviously an event took place that brought about this new problem, most
> likely user induced. the 'noise' from the speakers, if it sounds like a low
> frequency hum or buzz, than that's likely a faulty ground return. the
> speaker system is not likely grounded, but the monitor would be, so if the
> monitor is not properly connected to a good ground, then it could induce
> 60Hz hum into other AC powered devices on the line. the fact that the noise
> persists when you plug the monitor in the bathroom shows that it's not a
> speaker-to-monitor proximity issue, ie, the noise is not being induced
> because the speakers are too close to the monitor. i suspect a faulty
> ground, either in the monitor's power supply itself, the cord used to attach
> the monitor to the AC, or the wall outlets themselves not being properly
> grounded. you haven't given a description of the noise from the speakers,
> high or low pitched, intermittent (on/off), etc... so knowing that would be
> helpful. more details please, and be very specific. there is also the
> possibility that the speaker's power supply is failing, typically the first
> thing to die in those cheap power adapters is something called an
> electroytic filter capacitor, it's an electrical component that smooths out
> the DC supply voltage before it enters the device (speaker amplifier) that
> it's powering. with the information you've given us, it's difficult to
> diagnose at this point... if possible, replace the speaker's power adapter
> with a *regulated* power supply of the same voltage (available at radio
> shack).
>
> there is another possibility that i can think of, light dimmer switches, the
> cheap ones are notorious for inducing electrical noise back into the AC
> line, most notably, the halogen torch lamps with the cheapy variable dimmer
> switch mounted inside the pole. did you recently acquire anything like that
> or have a dimmer switch installed in any room? but you say the noise only
> occurs when the video monitor is ON, so probably not a dimmer switch, but
> check anyway to be sure.
>
> to fix the problem, i would first make certain that the monitor's power
> supply is not faulty or failing, next make sure that the electrical outlets
> that you are using are properly grounded (you can buy a simple and cheap
> ground tester at home depot), and then you might try electrically isolating
> the monitor from the the rest of your equipment with an EMI/RFI filter, also
> available from home depot, et al. (note, there are good LC filters that
> actually work, but cost $$$, and there are the bad ones that merely drop a
> cheap capacitor across the line, the do not work, so beware) Tripplite
> IsoBar series are good and a few other brands, but avoid the cheapie $20
> power bars) and a regulated power supply for the amplified speakers wouldn't
> hurt either.
> --
> francis
>
>
> >
> > Recently I began having a problem..
> >
> > When I do have my monitor plugged to the electricity, the speakers have a
> > background anoying noise... And the speakers have nothing to do with
> > monitor!
> >
> > 1-It is indiferent that the PC is turned on, or not..
> > 2-It is indiferent that the speakers are plugged to the sound card or
> > not..
> > 3-Already tried different speakers..
> > 4-Wherever I plug the speakers the problem remains, I can plug the monitor
> > in my bedroom and the speakers in the bathroom, and the noise
> > continues....
> > 5-I've tried changing the electricity cord of the monitor, nothing
> > changed..
> >
> > I'd really like some help here, guys...
> > Thankfully, JP
>
>

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