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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 8 months ago* (last edited 8 months ago) by j4k3@lemmy.world to c/asklemmy@lemmy.ml

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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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[–] FireWire400@lemmy.world 1 points 8 months ago* (last edited 8 months ago) (1 children)

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

[–] michael_palmer@lemmy.sdf.org 5 points 8 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.

[–] FireWire400@lemmy.world 1 points 8 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

[–] Fluke@lemm.ee 1 points 8 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 😂