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Capacitor safety vent audible sound

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bdunham7:

--- Quote from: morwind on February 06, 2021, 03:50:13 pm ---I am looking at designing an early detection sensor for the detection of failing capacitors in...

My sensor would detect the audible noise emitted during the venting process and when detected...

--- End quote ---

To me the main issue seems to be that your proposed method hardly qualifies as 'early'.  Secondarily, properly specified and designed systems don't usually have the capacitors vent as a common failure mode.

Siwastaja:
Indeed even when the capacitors fail, actually venting forcefully enough to make sound is extremely rare, that would mostly happen with grossly undersized parts, wrong polarity assembly, etc., and noted within minutes of post-assembly testing.

All capacitors I have ever replaced have either died just bulging a bit, or some have slowly oozed out the electrolyte during months or years.

Ian.M:
Morwind hasn't been back:

--- Quote from: profile ---morwind
Newbie
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Posts:1 (0.167 per day)
Date Registered:February 06, 2021, 03:40:36 pm
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Last Active:February 06, 2021, 04:00:21 pm

--- End quote ---
not even to read the first reply in the thread (my one).
Of course its possible they are lurking, but that would imply they do *NOT* want to interact with us, which frankly wouldn't be surprising given the probable younger agegroup ("degree student") as they may well be misinterpreting the fact that their concept has been shot down in flames as hostility towards themselves.

@Morwind,
If you are lurking *PLEASE* log in.  We value full and frank technical discussions and are eager to help.

MathWizard:
Old thread but I was just powering back up a stereo I'm working on (speakers are off), only applying ~75% of mains voltage from the auto-transformer, and I hear a hissing noise like air escaping, or like strong solder flux boiling away when the iron hits it. It lasted about 1-2seconds, and faded away. So I turned it right off.

The voltage rails looked like they were bouncing around some, and I powered it again, and hear the same noise in a few moments.

I had already checked most all the all the caps, out of circuit with an LCR meter. I put them all back with the polarity as marked on the PCB.

I've never heard a sound like this from a circuit before, so now I have to take it all off the heastsink again, and get covered in TIM again, and strip the screws/mounts even worse....

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