A few seconds of ambience, then a few seconds where I hold my mouse to the microphone (audio-technica AT3035).
Yes, my mouse, a logitech mx510 has built in coil buzz/whining.
I was stretching out after a few hours in front of the computer, and found myself in a position where I heard this noise. Naturally, I stopped mid-stretch to focus in so I could figure out where it came from.
At first I thought it was my monitor, since it makes a noise too (but not of that character).
Guess my surprise when I zoned in to the mouse as the source