I have a adsl router (DLink DSL504T) which makes an extremely irritating 10kHz+ whine, this appears to be coming from a
3V3 stepdown switcher's inductor.I assumed that the noise was due to windings vibrating but trying to damp any movement by squeezing the inductor with my fingers had no effect.
Does anyone have first-hand experience of fixing this kind of issue (I don't really want to redesign the converter!) - RTV or varnish seem like ideas but tend to be a bit final - hence the request for real experience rather than inspired guesses.
TIA!