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To rephrase it: Since vibrations are responsible for soundwaves, what parts are most prone to such vibrations? Root causes are probably electrical oscillations between capacitors and inductors in the kHz region - are there different causes?

JRE
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JHK
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    Vibrating transformers, high frequency oscillators, piezoelectric effects in ceramic capacitors. These tend to be the most common. – DerStrom8 Mar 03 '16 at 21:35
  • Faulty old power transistor or dry joints can make interesting thunderstorms in your loudspeakers.... – soosai steven Mar 04 '16 at 02:00
  • Don't forget elongation/contraction of ferromagnetic inductor cores under varying mag flux – Robherc KV5ROB Mar 04 '16 at 03:06
  • @duskwuff yes, it solved my question. An even better answer is given [here](http://electronics.stackexchange.com/questions/126502/how-can-purely-electrical-circuits-emit-sound?rq=1). I thought I did search, but if I did it was not well enough ... – JHK Mar 04 '16 at 18:02

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There can often be issues with coil whine from inductors or transformers - I recently had this issue with a computer PSU. If the magnetic field generated by the component is oscillating (ac current) it can create a mechanical vibration in the components resulting in sound being generated.

BenAdamson
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