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Re: Hum/Buzz

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Az Barber

(A)

In Reply to: Re: Hum/Buzz posted by oldroadie on February 1, 2005 at 19:12:57:

Thanks for helping out guys! I really appreciate it!
The pin 1 problem ain't it. First off, I'm using Jensen Isolators which have a switch to eliminate the Pin 1 problem, and I've tried consumer amps with unbalanced inputs... they all exhibit the same buzz.
I did not know to check the earth ground. How is that checked? I know there's at least one metal rod jammed into the ground that has the tele, cable tv, and electrical service grounds attached to it. Is there a way to check it for resistance or potential?
The dimmers were removed. The buzz is still there. If I get rid of the buzz, I'll retry the dimmers and see what happens. But right now, they are physically disconnected and the buzz still exists.
I am considering solar and a bank of batteries!
Az

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Re: Hum/Buzz - oldroadie 22:48:10 02/10/05 (3)
Here's a link to a real good discussion of your issue.
Pro Sound Web is a pretty good resource for any of this type of info.
I'm afraid my basic skills have taken you about as far as I dare go.
I don't like to play with AC too much, folks can get killed for bad advice.
Good luck

Tom
- http://srforums.prosoundweb.com/index.php/m/31420/2407/?SQ=5bb4d0e1f9346d189fc7acd8eac85a47#msg_31420 (Open in New Window)
- Re: Hum/Buzz - Jacques 14:03:23 02/12/05 (2)
  I got a neat idea on what in going on .
  As my answer is somehow long, and involves drawings, I posted it at:
  Good luck and patience in reading this page!
  - http://www.atout-tech.com/autres/humnbuzz/Hum_and_Buzz_problem.html (Open in New Window)
  - Re: Hum/Buzz - Az Barber 19:24:34 02/18/05 (0)
    Thanks Jaques! Thanks to you, I found and repaired a neutral leak to ground. That reduced the hum to about half what it was. I then tied all my amps (balanced and unbalanced) together with a chassis ground hooked to my Jensen isolation transformer and...
    NO MORE BUZZ OR HUM! Even with my super sensitive speakers (105db at 1w/1m) you have to stick your ear into the horn to hear any noise at all.
    Even the dimmers have no effect at all!
    I'm so glad I don't have to listen to that annoying buzz anymore...
    Thanks again Jaques and Oldroadie!
    Az
  - Re: Hum/Buzz - Az Barber 17:46:04 02/12/05 (0)
    Wow, Thanks! I've read your message three times and even though I don't understand all of it, I can easily test for neutral leaks to ground. Since the previous owner did not properly hook the grounds up to several outlets, I suspect one or more outlets is incorrect causing the problem you describe.
    FWIW, I tried turning off every circuit except the one that powers the equipment off and I still got buzz.
    At any rate, you've given me several tests and a lot to think about! Thanks again!
    Az

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