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*
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?