[Letitring]

Oh, okay, thanks. I posted back to you but forgot to include your name. :(

This noise comes from outside my house. Does that make a difference in what you said? I have surge protectors on most of my stuff. Don't know if they help or not, but yes have several brown outs, if that's what causes the dimming of light bulbs. Interesting.

[Myrddin]

This noise comes from outside my house.

Do you have an air conditioning compressor outside your house? For central air conditioning, this is usually a large box 3 ft X 3 ft or larger with a big fan inside. It turns on at the same time as your inside air conditioning.

[catpuppy]

Ringy, it sounds like perhaps a tree is causing both the noise and the power glitches.

[Revel]

"I have surge protectors on most of my stuff. Don't know if they help or not, but yes have several brown outs, if that's what causes the dimming of light bulbs. Interesting."

The surge protectors only protect against high voltage...Not low voltage. However it is unlikely that Electronic equipment will be damaged by low voltage alone. Unless there are High voltage spikes mixed in. However as it was said...Many Motors are very unhappy with low volgage situations(Brown outs). They should be shut down imediately or you risk loosing them.