Audio hum

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Old 01-12-19, 03:34 PM
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Audio hum

What is the technical term when you touch the audio cable plug from the computer "line in" and you get the humming noise?
 
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Old 01-12-19, 03:51 PM
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That is 60cycle (hz) hum.
 
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Old 01-12-19, 04:10 PM
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Isn't there technical term? I want to use the term feedback, but I don't think that's correct. But thanks for the proper reason for the hum.

I don't quite understand what 60 hz has to do with it though. Would 50 hz be any different?

The reason I ask is that I have several audio outputs cords going to my computer line in receptacle. Not always used, so they just hang out bare. I made some isolator caps for them so I don't accidentally touch them or have them touch each other.

 
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Old 01-12-19, 04:36 PM
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The 60 cycle hum is the signal given off by every piece of electrical equipment in your house. All the wiring in your home is transmitting a 60hz signal from the power company. If you were in Europe...... you'd have 50 cycle hum.

If you connected two pieces of gear together and that process created a hum.... that would be called a ground loop. The hum would still be 60hz.
 
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Old 01-12-19, 05:46 PM
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OK, I get it now.

Thanks for the info.
 
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