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Originally Posted by Wim Libaers
Transformers have moving parts. The laminated core will have vibrating sheets due to the changing magnetic fields. It's like a loudspeaker, but not intentional. This is minimal at low power and with well-made transformers, can be quite loud at high power and with old or badly made transformers.
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First off, transformers used in computer devices are usually solid ferrite cores, which do not vibrate and hence cannot produce noise. Furthermore, the sound produced by a vibrating laminated core is more of a low-pitched humming noise, not a high-pitched squeal. What may be producing the latter is the switching-mode inverter present in his power supply. Cheap inverters can produce a high-pitched squeal when operating at high frequencies.