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Do you often hear the ringing of switching power supplies and devices when you are in a quiet space? (lemmy.world)

submitted 9 months ago* (last edited 9 months ago) by [email protected] to c/[email protected]

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I'm curious, how many people are aware of these sounds. I have designed, etched, and built my own switching power supplies along with winding my own transformers. I am aware of the source of the noise. So, does anyone else hear these high frequency sounds regularly?

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[–] [email protected] 22 points 9 months ago (1 children)

Yes. They drive me nuts. My family had a PC that would buzz whenever you moved the mouse. We have a bunch of cheap LED lamps in my apartment and every one has an especially loud transformer.

[–] [email protected] 1 points 9 months ago* (last edited 9 months ago) (1 children)

My main laptop is making similar noises all the time, I think they come from the CPU.

[–] [email protected] 5 points 9 months ago (2 children)

The CPU itself doesn't produce sound, but inductors (coils) can. Therefore, when you move the mouse, the CPU power increases, potentially causing inductors to go into resonance.

[–] [email protected] 1 points 9 months ago

I thought it was maybe some kind of audio chip interference coming from the CPU as it's not tied to cursor movement in my case

[–] [email protected] 1 points 9 months ago

Graphics system usually. Back in the day I used to be able to tell where on the screen the cursor was from the pitch of the coil whine.

I buy better hardware nowadays 😂