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All Forums > Tech Talk > Tech Talk Forum Page 24 > Weird digital noise.
AuthorPost
conquistador
Deactivated User

Hellhamster.
2947 Posts
10/03
Posted - Jul 29 2008 : 1:09PM
How do I properly ground a computer and a stereo system?
Drew Black
broken crankshaft

8009 Posts
9/99
Posted - Jul 29 2008 : 1:53PM
Typically it's accomplished through the third prong on a 3 prong plug in North America. Some stereo equipment will have an external/secondary ground post on the back side.
You're most likely fighting against a building wiring problem and won't be able to fix it just by adding another ground. You'll most likely need a power conditioner if it is really noise related to the supply side of things. Are you experiencing a 60 Hz hum?
conquistador
Deactivated User

Hellhamster.
2947 Posts
10/03
Posted - Jul 29 2008 : 1:59PM
Not a 60 Hz hum. It fluctuates when my volume is above zero.
Either I have to be playing music for it to go away or the volume has to be totally off.
There are only 2 3-prong outlets in my apartment. My computer is running off of a power-bar from one and about 30 feet of heavy duty extension cord.
The stereo is acually plugged into he same power-bar so I don't think it is a grounding issue.
Edited by - conquistador on 7/29/2008 2:14:40 PM
Drew Black
broken crankshaft

8009 Posts
9/99
Posted - Jul 29 2008 : 8:03PM
Being in an apartment is most likely related to the problem.
BTW, if there's only two 3-prong outlets in your place and the rest are 2-prong I wouldn't be surprised if the 3-prong ones aren't actually grounded.
Do you have any GFCI outlets you could plug into for a test?
conquistador
Deactivated User

Hellhamster.
2947 Posts
10/03
Posted - Jul 29 2008 : 10:06PM
^^^
No GFCI outlets in the whole building. But the power strip claims to be grounded (it's ground light is on).
Edited by - conquistador on 7/29/2008 10:14:53 PM
 
Drew Black
broken crankshaft

8009 Posts
9/99
Posted - Jul 29 2008 : 10:28PM
That's a fancy power strip.
Do you have your computer hooked up to the stereo? If so using the line-out or a speaker-level output?
conquistador
Deactivated User

Hellhamster.
2947 Posts
10/03
Posted - Jul 29 2008 : 10:34PM
It is a fancy power strip.
It's plugged into the line out.
I am beginning to suspect that the problem lies within the cord. I didn't realize at first that the connection might be shitty because of couplings. I'll look for a long RCA cable tomorrow and see if that helps.
ninja1
Senior Member

2939 Posts
1/08
Posted - Jul 29 2008 : 10:39PM
Any new additions or changes to your setup? Relocated any equipment? Computers and other electronica emit a lot of EMI/RFI electrical noise, but it is supposed to be filtered. Stereo (especially radios/receivers) are sensitive to electrical noise. Try moving things around to create separation distance. Are your stereo signal cables shielded? Does it matter what function (tuner, TV, DVD, etc.) the stereo is doing? Experiment, experiment, to try to pinpoint the particulars of the problem.
ninja1
Senior Member

2939 Posts
1/08
Posted - Jul 29 2008 : 10:42PM
Make sure you get a shielded RCA cable.
conquistador
Deactivated User

Hellhamster.
2947 Posts
10/03
Posted - Jul 29 2008 : 10:56PM
I don't know if I have ever seen a shielded RCA cable. Is it something you can see or will I have to check the package?
If I am not going to use couplings I need a 3.5mm male to stereo RCA cable about 12 feet long.
Edited by - conquistador on 7/29/2008 11:01:17 PM
conquistador
Deactivated User

Hellhamster.
2947 Posts
10/03
Posted - Jul 29 2008 : 11:07PM
I think this is probably my problem.
I was so excited about using my new CPU that I thoughtlessly set up the fastest thing I could. My connection is computer>6foot male-male 3.5mm stereo cord>female 3.5mm to female RCA>12 foot RCA cable>Back of stereo receiver. Not a very clean connection.
New_problem 002.jpg
Edited by - conquistador on 7/29/2008 11:10:38 PM
ninja1
Senior Member

2939 Posts
1/08
Posted - Jul 29 2008 : 11:25PM
In the store, the word "shielded" will appear on the package description, and it will be a little more costly than the unshielded version, (if the store happens to have both). It will say something like "shielded RCA audio/video cable 6ft."
I think that only a super-discount store will offer unshielded.
At Wal-Mart or RadioShack or Sears, everything probably will be shielded, and the package will say so. Generally speaking, the shielded ones are a bit bulkier, but it's really tough to tell visually. But if the one you have came with something you bought like a DVD player, it's probably shielded. If the one you have is something you've had forever, and strikes you as "flimsy", or your remember paying 99cents for it, then it's probably not shielded.

conquistador
Deactivated User

Hellhamster.
2947 Posts
10/03
Posted - Jul 29 2008 : 11:28PM
^^
Thank you.
RandomPrecision
Senior Member

Enjoy!
8175 Posts
3/06
Posted - Jul 30 2008 : 9:34AM
Most RCA cables of any reasonable quality should be shielded these days. Although it never hurts to check and try to make sure.
Don't fall for the super expensive cables (I'm thinking Monster). In most cases, there are much cheaper cables that are just as good.
Edit - By the way. I've had issues with noise I simply couldn't get rid of. I don't know. One of my old computers had terrible noise problems with the onboard sound card. Nothing I did helped. The onboard sound with the computer I have now is actually very clean and sounds nice. I was surprised since you just typically don't expect that.
Edited by - randomprecision on 7/30/2008 9:36:19 AM
RandomPrecision
Senior Member

Enjoy!
8175 Posts
3/06
Posted - Nov 20 2008 : 2:19PM
If anyone else is having this problem, here's how I solved it. Simply run a length of copper wire between your PC case and the ground of your receiver. On my receiver, the antenna was marked as the ground. The hum was driving me nuts. There is still the slightest hum but nothing like it was.
 
jayo All-Star Supporter
All-Star Member

2117 Posts
7/04
Posted - Nov 20 2008 : 11:35PM
Yeah, it's suck grounding. I used to get it on my cheapie PC speakers, but I tossed those and went totally headphones, which I like a lot better anyway.



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