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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Noise
Hey, I'm trying to connect the output of my computer sound card to the input
of my stereo reciever. I hear it but a loud hum kills the sound. My grounds are good. What the heck could be causing this? Sound card incompatability? My regular pc speakers work fine. Is there a fix? --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.553 / Virus Database: 345 - Release Date: 12/18/2003 |
#2
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Noise
BananaPannaPoe- wrote: Hey, I'm trying to connect the output of my computer sound card to the input of my stereo reciever. I hear it but a loud hum kills the sound. My grounds are good. What the heck could be causing this? Sound card incompatability? My regular pc speakers work fine. Is there a fix? Really sounds like it may be a ground loop problem. You'll need to find the culprit first (which could be a number of places). Does the receiver have anything else connected to it (especially something like a TV or VCR with a cablvision cable hooked up to it)? If so, disconnect all the other items except the PC and see if it reduces or eliminates the hum. If there IS a cablevision cable hooked up, try disconnecting it first. If disconnecting the cable fixes it, get an isolation balun for your cable Are the receiver and PC plugged into the same outlet? If they are not, try doing that and see if the hum reduces some. If these checks don't reduce the hum, you may need an audio isolation transformer between the PC and the receiver. - Jeff |
#3
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Noise
You're right. It was coming from my TV audio output. But why?
I like to pipe that sound through my stereo speakers when I'm playing a DVD movie. I guess the TV needs an isolation transformer. I hate to run an extension cord all the way across the living room just to have the TV on the same outlet. My audio wire goes down through the cellar and up at the stereo. It didn't conflict with my cassett deck, only the PC. "Jeff Wiseman" wrote in message ... BananaPannaPoe- wrote: Hey, I'm trying to connect the output of my computer sound card to the input of my stereo reciever. I hear it but a loud hum kills the sound. My grounds are good. What the heck could be causing this? Sound card incompatability? My regular pc speakers work fine. Is there a fix? Really sounds like it may be a ground loop problem. You'll need to find the culprit first (which could be a number of places). Does the receiver have anything else connected to it (especially something like a TV or VCR with a cablvision cable hooked up to it)? If so, disconnect all the other items except the PC and see if it reduces or eliminates the hum. If there IS a cablevision cable hooked up, try disconnecting it first. If disconnecting the cable fixes it, get an isolation balun for your cable Are the receiver and PC plugged into the same outlet? If they are not, try doing that and see if the hum reduces some. If these checks don't reduce the hum, you may need an audio isolation transformer between the PC and the receiver. - Jeff --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.553 / Virus Database: 345 - Release Date: 12/18/2003 |
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