Re: [Electronica] Ground loop hum problem
- From Experience since Both work alone, its probally the Grounds are Different. One may be a Hot Ground or a Floating Ground, or not Grounded at all. a Isolated a/b switch may have to be used. The Output Signals/Grounds May not Mix together/be compatible. One may Load another!... I Tried! Jack at my new website... http://www.ElectronicNow.com----- Original Message -----From: naturist54956Sent: Saturday, November 29, 2003 12:40 PMSubject: [Electronica] Ground loop hum problemGroup members,
I have only basic AC/DC and electronics training.
I'm trying to troubleshoot what I think is a ground loop hum
problem associated with my audio system. Let me give a brief
I wanted to route all my audio signals through my main amp via
the AUX input, so I got a 3-way switching box for all the RCA
plugs (3 input - 1 output) and connected signals from my
computer, the VCR and the TV.
60 Hz hum. Not loud, like full current, but really annoying.
Although I have yet to isolate the problem, I know that whenever I
connect both my computer and my TV audio to the stereo, I have
My VHF antenna is well grounded (8' rod) and all appliances (TV,
stereo, VCR and computer) are routed through the same
Panamax Surge protector - common power source.
There is no hum problem if I connect EITHER the computer or
the TV, but there is with BOTH connected.
I took some resistance readings, here's the results:
Between safety ground and VHF coax ground - less than 1 ohm.
Between safety ground and broadband cable ground - 1.5 to 2
Is this a significant difference?
Any ideas or suggestions?
Feel free to ask any questions you like.
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