I came across buzz noise when my air condition started on. The noise will be gone after a second. I thought it either triggered by ac voltage dropped when air condition motor just started, or the air condition motor starting making a lot of ac noise. I tend to believe ac voltage dropped, because I had already have Furman IT-reference 20 for isolating noise.
If buzz is caused by ac voltage drop, I'm thinking to add more capacitors in the place of 220uf/250v to make them 440uf/250v. is it a good idea? any other suggestion?
Paul, doc B, anybody, please input.