Could be resonance. Unplug it from your components and see if it still makes a noise. Then from the power source and see if it still makes a noise. If out of warranty and you feel safe opening it up (you're an engineer, so you know everything), try pressing on various components with a non-conductive material and see if that addresses the issue.
Dilbert_X wrote:Two of my PSUs have been making high frequency pulsed noises for a while, when the PC is off. Meeeep Meeeep Meeeep just within the audible range and very quiet.
Are they about to die?
I do know that there were a ton of faulty capacitors made in the 00s. See "capacitor plague" if you don't mind reading a bit of history. Replacing a busted or worn capacitor is certainly within my knowledge, though it's not something I'd generally bother with.
It's hilarious to me that you can replace a key with a jabby triceratops head if you feel so masochistically inclined.
Pochsy wrote:I checked out that Drop site discussed above. Some really nice things there. Hilarious that there's a hobby market venn diagram overlap between mechanical keyboards and headphones. I think there's a lot to unpack there. I mean, I'm in that section of the diagram myself...but man, it's never been presented to me so starkly.