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9V Transformer is Buzzing - Need I Worry?

Discussion in 'Electrical Engineering' started by Billy, Oct 29, 2003.

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  1. Billy

    Billy Guest

    I have a 9VAC GE security system transformer that began to make a faint
    buzzing sound and I'm worried this may be unsafe. The noise started a week
    ago after several weeks of it *not* buzzing when first installed - or at
    least I never noticed it. The unit does *not* appear "hot".

    I changed the receptacle that it is plugged into and checked for grounding
    and it is properly grounded. I tested the voltage for 110v with a multimeter
    and it is steady at 110. I also swapped the transformer with a new one but
    it still buzzes. Finally, I ran the transformer to another two outlets and
    it buzzed on both, but each with different intensity.

    What could be the cause of this, and how do I fix it? Is this a warning that
    it should not be used or corrected?
  2. That'll dang sure do it. Another thought is to ring up my favorite
    surplus company ( and get another for less than $10. Use 'ol
    buzzy for a paperweight.
  3. John

    John Guest

    Its called a hysteresis hum caused by loose laminations I would replace
    it cheap enough to do Not likely to happen but it could cause the
    insulation coating on the windings to deteriate causing a short
    circuit.And please don't correct my spelling
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