How does a transformer make clicking sounds when being powered ON or when it is bucking/boosting voltages, without having any moving parts inside?
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The clicks could be relays inside the module. Relays do have parts that are physically moved back and forth by electromagnets to complete or break the circuit. They typically make a click sound when that moving part snaps into one of its places inside. There might be something with the circuitry that causes the relays to constantly engage and disengage, I don’t know.
Or it could be the noise of arcing. Depending on the kind of transformer and what it’s doing, arcing *could* be a normal and expected thing or it could be a symptom of some defect.
If the clicking is more like buzzing, then it’s just the normal sound ferromagnetic materials sometimes make when they’re inside a strong and constantly changing electromagnetic field.
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