Quote:
Originally Posted by heero_yuy
It's called magnetostriction. It comes from magnetising the core of the transformer. It slightly changes the dimensions and thus makes a noise.
Normally we try to run the PSU's at above 20kHz so users simply can't hear it.
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Chances are the buzzing on the SH's adapter is 50Hz hum from the primary side, not the switching on the secondary.
---------- Post added at 19:44 ---------- Previous post was at 19:38 ----------
Quote:
Originally Posted by Sephiroth
Does that frequency apply to the poxy Superhub PSUs?
And to interpret your explanation, change of dimension means vibration, the frequency of which defines the noise pitch. The vibration can transmit to other components that in a confined space such as a poxy Superhub PSU, need to be glued into a more stable alignment.
Am I wrong?
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Not entirely sure what you're getting at. The very basis of electromagnetic transformers involves electromagnetic fields and thus forces being applied to the components. When things are subject to forces, they move.
All electromagnetic transformers vibrate and whine. How much exactly is a matter of design and manufacturing tolerances, but it's no different to the buzzing you hear around overhead mains transformers and substations. Doesn't mean it's broken or about to blow up.