On Wednesday, July 25, 2012 7:42:42 AM UTC-6, Winston wrote:
My DW9118 charger emits a loud ~10 KHz audible tone
when charging a battery. It didn't use to do that.
Anybody else have one of these?

--Winston

You could use the old TV repairman's standard fix, toothpicks and Ambroid glue to keep the windings from shifting. Used to do that with flyback tranformers when they got too annoying.

Stan