Ground loop hum

Posted by wt kwong on October 02, 1998 at 23:30:58:

In Reply to: Ground loop hum posted by Alan Maier[SysOp] on September 27, 1998 at 08:52:34:

: Mike,

: The problem in your setup is that the two circuits have a problem with ground potential. Most likely the existing circuit had a faulty ground due to a weak point in the chain of outlets - you might want to address this for piece of mind as it indicates a possible house wiring problem, in particular you most likely have a bad ground connection at an outlet between your system and the service panel. In the meantime you need to connect your entire system to the dedicated line.

: Alan

: : I had my stereo setup running off of one 14ga 15amp circut. I decided to add a dedicated AC 20amp 12ga wire circut for my amps. When I did this I now get a hum from my speakers. When I plug everything into the old circut the hum disappears.
: : So I know its being caused by the new ground. Any tips for correcting this?
: : I put a cheater plug on the new circut bypassing the ground and all is fine. I would like to fix this the correct way.
: : My next step is to go into the breaker panel and wire the grounds and neutral wires together. They are currently on common blocks. Do you think this would help? I appear to have a mis-match of resistance which is causing the hum.
: : Another thought is to run the ground wire from the new socket to the old one, thus passing the ground back to the old circut from the new one. This would keep a common ground and maybe kill the hum?
: : Any adive or comments?

Mike

If you're serious about your AC and if you have a backyard you can try to create the perfect ground by using a copper rod (longer is better, but 6' is probably minimum). Dig a hole 2' deep. mine the rod, and connect your dedicated ground to the rod.

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