this post was submitted on 19 Jun 2026
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It's without a doubt the LED's themselves. Moving closer to the exact location of the LED confirms it.
For some cheap products, I've physically cut one side of the LED pin to shut it up, and the buzzing stops.
Though technically it could be the sound of a capacitor charging/discharging or the resistors, not exactly sure on the exact mechanism, but it's at the very least something on the LED circuit.
Encouragement to do a double blind test on this one; box up some LED's with a power strip, one on and one off, have the person who set them randomize which are on and then you guess which (neither, R, L, both). Repeat a few times.
I know similar experiences aren't predictive, the sound is a kind of synesthesia with the concept of running electronics (which is itself pretty cool/interesting!).
A double blind would mean no results are discovered lol.
A single blind test would be fine.
~~And yes, I've done this. I've turned away from a device, and my partner either toggled a switch powering thw device, or a switch which wasn't connected to anything.~~
Perfect accuracy.
Edit: I replied when i first woke up. I didn't read carefully.
Neat experiment idea but I don't have a tools for that lol.
If I ever do, I'll pin this message and reply to it :p