[Hidden-tech] Audio Humm in Desktop Computer...

[ussailis at shaysnet.com]

The only ground you have is if you have a metal case and the power source
line is grounded to the case. Check for a green wire in the power cord
line, it shound be connected to the metal case. BE CAREFUL. A wire might be
wrong. I don't want to be one sending flowers.

The only other thing I can think of is a "ground loop." Check all external
devices to make sure they are properly grounded. Here a low cost Ohmmeter
can help. For example, make sure the microphone connector shell (normally
at ground potential) is actually connected to the mating connector outside
at the computer.

Remember, these cords are made for prices that are very cheap. Quality
isn't there. There can easily be a missing ground connection.

Finally, move around any AC cords that may be close to the computer.
Sometimes just the presence of an AC line can cause this problem, as it
does with my living room telephone.


Jim Ussailis

Original email:
-----------------
From: David F. Farkas david at farkas.com
Date: Mon, 19 May 2014 16:40:52 -0400
To: Hidden-discuss at lists.hidden-tech.net
Subject: [Hidden-tech] Audio Humm in Desktop Computer...


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