Marbury wrote:Thanks for the kind offer Mike but looking at the Youtube comments from the link you provided, it has made people's noise worse.
I can't view that video on the ancient iPad I use for nocturnal forum posts :? But there are 2 potential reasons for an increase in noise when connecting via an isolating transformer. One is that the isolating transformer is placed near a mains transformer, so it picks up magnetic inductions of the mains. And the second is that the original problem noise wasn't caused by a ground-loop (normally because the device is Class-2 or double insulated), and the problem was actually a missing ground reference, instead.
As always, the key to solving problems like these is to correctly analyse, interpret, and understand the problem... and then apply the appropriate fix. There is no simple one-solution-for-all scenarios.
I can't believe it as I changed the extention block, and it went to almost silent for a good while.
More new evidence that points towards less-than-perfect mains earthing arrangements...
It's an absolute swine of a problem.
Ground-loops and earthing often are, especially if the fault finding process lacks rigour and logic.
I am pretty sure it's the wireless mouse and keyboard that is doing it.
If I was a betting man I'd bet my house on them being a symptom rather than the problem.