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Riden RD6006P faint hissing sound

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TechSplendid:
Here a few pictures. The noise seems to be coming from the buck regulator and not the psu itself. But if I understand you correctly, this is normal and not bad?

DavidAlfa:
Electrolytics connected backwards sometimes do that before exploding.
Just joking (It would have already blown apart  :D)

Some switched PSUs run in burst/skip mode when the load is small.
Than means: Switching few pulses, stopping, switching again and soon.
As you increase the load, it eventually starts continuous regulation, where every single PWM cycle puts some energy.

The modulating frequency is within the audible spectrum, that's why you hear the hissing.
To me it pretty clear seeing the waveforms. Nothing to worry about, unless that PSU was not suppossed to to that  ::).

https://www.analog.com/en/technical-articles/when-pulses-are-omitted-in-switch-mode-power-supplies.html

adeuring:
A bit off-topic but anyway: The acoustic noise generated by inductances and capacitors can even be used to extract a private RSA key by observing the acoustic "noise patterns" during the decryption of RSA encrypted messages:

http://www.cs.tau.ac.il/~tromer/acoustic/

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