Re: SPEAKERS NOISE!!
From: francis gérard (spam_at_spamcop.net)
Date: 08/03/04
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Date: Tue, 3 Aug 2004 15:56:51 -0400
"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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