abbey road d enfer

ultrasonic cleaning works by cavitation, that is, zero-pressure "negative" bubbles collapsing and exploding, giving local scrubbing action
@Jakob, Winston, living sounds, OK, I've been warned! I'll limit the use of US cleaner at PCB's only!
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

Interesting test with the Alu foil Jakob,
Thing is if you remove the oxide layer from aluminium it readily reacts with even air itself. Gold as we know doesnt tarnish or go dull  , of course thats no guarantee a sonic cleaner wont damage a precious capsule either, still would be interesting to test the theory.

I read somewhere the presence of a voltage on the foils of a capsule can in itself cause dust to become attracted,
for that reason I went with a similar arrangement to a U47 where the central electrode has the polarising volts applied with the front membrane connected to grid at or near 0V.  Interested to hear if anyone has noticed certain mics are more prone to contamination than others .


Years ago I did something similar with a gunked up capsule in a cheap mic that I didn't care much about if I destroyed. Except:

1) I used a small aquarium filled with distilled water.
2) Connected a small air pump to LDPE piping and poked small holes through it with a safety pin
3) I coiled it around and held it together with a tie wrap then plugged the other end of the hose and submerged it in the tank.
4) Turned the air pump on and we now had small gentle aeration/agitation/bubbles.

I dunked the capsule in the center of the ring of tiny bubbles. It worked well!
But at the time I thought it was silly so I didn't share--in fear that someone like a "Klaus" might come along and write a dissertation on my idiotic method of destroying a capsule.  ;D

EDIT: If I were to redo it today I'd use a Y connector to pump air into both ends of the pipe "ring".
« Last Edit: November 28, 2020, 08:23:09 AM by Ethan »
I am just the Web Geek here.

Interesting idea Ethan,
bubbles of air seem less likely to do damage than any kind of physical contact, even a fine brush .
Maybe C02 bubbles/water which is slightly acidic might be even more effective at scrubbing.
Preferably you want to avoid getting liquid behind the membrane, the surface to be cleaned need only sit just below the liquid as opposed to fully dunked  :D
By the sounds of it there's a pile of business out there cleaning capsules , a fool proof cleaning methodology with no chance of physical damage could be a real banker.


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