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Re: [Electronica] Ground loop hum problem

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  • Jack Emery
    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
    Message 1 of 1 , Nov 29, 2003
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         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 -----
      Sent: Saturday, November 29, 2003 12:40 PM
      Subject: [Electronica] Ground loop hum problem

      Group 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
      explanation:

      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
      hum.

      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
      ohms.

      Is this a significant difference?

      Any ideas or suggestions?

      Feel free to ask any questions you like.

      Dick



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