Electronics > Beginners
Do inductors sing in old age?
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CJay:
Yes, they can do, I've also heard inductors/transformers 'singing' because of other components going faulty (electrolytics usually), changing those bits silenced the inductors
NivagSwerdna:
I attached the clock to a lab power supply and gave it 12v and then adjusted the voltage down. Interestingly at about 11v it is considerably quieter and then gets louder again towards 9v. I also notice that it is quieter when not under load.
I really don't remember it being this noisy and putting my ear close I can perceive what might be described as fizzing or at a stretch crackling.
Perhaps I should preemptively replace the input electrolytic? (Which is a PITA since it is SMD flavour)

Just checked my schematic and I'm pretty sure I ended up with...
"EEEFTH101XAP -  SMD Aluminium Electrolytic Capacitor, Radial Can - SMD, 100 µF, 50 V, 0.34 ohm, FT Series" on the input side.  That looks like a good choice... not sure I have any spares.
soldar:
I had an old hard disk that would sing the Travi-ATA.

The newer ones do the Travi-SATA
CJay:
Could be input or output, could be both, could be neither and it could be a loose winding on the inductor as well.

Mechatrommer:
yes they do sing old or new... if you have more time to kill you can build something useless and have a life by getting 50K likes, and possibly participate in america got talent or hope george lucas will hire you and then have some stories to tell your grand children.

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