PC S-Video Out to Receiver = Horrible Buzz...Please Help?

Archived from groups: alt.home-theater,alt.comp.periphs.videocards.nvidia,rec.video (More info?)

It sounds like you have a "ground loop" now in your system caused by the PC
system and your HiFi system being at different relative ground levels. You
may need to install a 'ground isolation transformer' in the circuit.

--
DaveW



"Magna Mater" <mothermisericordiae@yahoo.com> wrote in message
news:363nfcF4teu03U1@individual.net...
>I just recently tried to hook up my PC video card (old GeForce2 MX) to my
>receiver (Outlaw 1050) using the S-Video out.
>
> Whenever I plug the S-Video cable from my PC video card to my receiver
> (using the "Video 1" input (entirely inactive, including the RCAs)), I get
> a horrible and very loud buzzing sound through my speakers.
>
> The buzz is on all channels: AUX, Video-1, Video-2, DVD, etc. It's at a
> constant volume no matter how I adjust the knob unless I turn it to zero,
> at which point it disappears altogether.
>
> The picture works fine--I get Windows 2000 on the TV screen. I already
> have my PC sound card hooked up to the receiver using a digital
> coax-to-digital optical converter, assigning the digital input to the AUX
> channel. This has worked well for a couple of years now.
>
> My cables are short with no coils.
>
> Why the buzz? Any help would be appreciated here.
>
> MMM

Archived from groups: alt.home-theater,alt.comp.periphs.videocards.nvidia,rec.video (More info?)

On Sun, 30 Jan 2005 04:26:02 -0500, Magna Mater
<mothermisericordiae@yahoo.com> wrote:

>I just recently tried to hook up my PC video card (old GeForce2 MX) to
>my receiver (Outlaw 1050) using the S-Video out.
>
>Whenever I plug the S-Video cable from my PC video card to my receiver
>(using the "Video 1" input (entirely inactive, including the RCAs)), I
>get a horrible and very loud buzzing sound through my speakers.
>

Not surprising, since your PC video card has no audio circuitry, only
video. Apparently you are feeding video signal to your receiver and
your are hearing the frame-rate buzz. You need a separate audio card
( or motherboard audio ) in your PC from which you feed the audio to
the receiver...as you have done already.

John Lewis


>The buzz is on all channels: AUX, Video-1, Video-2, DVD, etc. It's at a
>constant volume no matter how I adjust the knob unless I turn it to
>zero, at which point it disappears altogether.
>
>The picture works fine--I get Windows 2000 on the TV screen. I already
>have my PC sound card hooked up to the receiver using a digital
>coax-to-digital optical converter, assigning the digital input to the
>AUX channel. This has worked well for a couple of years now.
>
>My cables are short with no coils.
>
>Why the buzz? Any help would be appreciated here.
>
>MMM

Archived from groups: alt.home-theater,alt.comp.periphs.videocards.nvidia,rec.video (More info?)

DaveW wrote:

>It sounds like you have a "ground loop" now in your system caused by the PC
>system and your HiFi system being at different relative ground levels. You
>may need to install a 'ground isolation transformer' in the circuit.
>
>
>
Thanks...you nailed it! I did have a ground loop problem which I managed
to pinpoint to the cable antenna. I built an easy antenna cable isolator
with a pair of 75 to 300 ohm transformers. Cost under eight bucks at
Radio Shack to fix the problem and better yet, since I have digital
cable--no signal loss!

MMM