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What electronic component of a computer produces (sound) noise?

What are some common sources of acoustic noise in circuits driven by a DC power supply?

One potential source is ceramic capacitor expansion/contraction which can result in flexing of a PCB board (source: EDN).

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If you down-vote, please explain why... – EmpireJones Aug 12 '12 at 4:39
Your question is not clear as to whether the source of the noise is external to the circuit and affecting the DC values, or if the DC circuit is making acoustic noise. The latter seems like a contradiction. Please explain what kind of noise you are seeing along with the circuit and operating conditions. – W5VO♦ Aug 12 '12 at 6:22
I'm guessing you don't mean a purely DC circuit, rather a circuit driven from a DC supply? – Oli Glaser Aug 12 '12 at 8:31
Similar question: electronics.stackexchange.com/questions/36710/… – m.Alin Aug 12 '12 at 9:41
@OliGlaser, thanks, yes! – EmpireJones Aug 12 '12 at 16:42
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marked as duplicate by W5VO♦ Aug 12 '12 at 17:13

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1 Answer

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Piezostriction and magnetostriction, but not if there is only DC in the system. Maybe only during change of system's state (energization, change of topology).

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A purely DC system is only usable to generate heat IMO :-). – stevenvh Aug 12 '12 at 7:48
so it will lead to thermal runaway and generate more noise. – sandun dhammika Aug 12 '12 at 9:45
Thanks for the answer. The original question has been tweaked a bit - the intention was a 'DC-driven circuit' rather than a 'DC circuit'. – EmpireJones Aug 12 '12 at 16:46

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