"Nick Gorham" wrote in message

Arny Krueger wrote:

"Nick Gorham" wrote in message



I just tried the experiment on a few caps I have to
hand. The ones that produces a sound when driven by a
sig gen were a BC 368WKT 220nf, Acotronics MKP 47nf and
a 2.2uf ClarityCap SA. Ones that I tried that didn't
prduce any sound I could hear were from Solen and
Mundorf.


Two problems:

(1) The stated problem seems to be not that the
capacitor produces sound (it's someplace inside the
bowels of the enclosure) but that operating in a sound
field causes the capacitor's operation to be modulated
by the sound field.

Well, I think not, in the video, the eng describes how
they tried to measure the capacitors sensitivity to
external sound, and they found nothing.

Thanks. I sincerily tried to listen to the video, but the screaming and
clanging from my BS meter was waking up the whole neighborhood prematurely,
so I had to stop before the police showed up. ;-)

Their point was
that internal resonances were taking place, and as a SIDE
EFFECT of this sound could at times be found to radiate
from the cap.

Which leaves me wondering where the beef is.

It seems to me that that the evidence you say they uncovered: "they tried to
measure the capacitors sensitivity to
external sound, and they found nothing" should have led them to conclude
that they were on a fool's errand.

However, the fool's money has been screaming in their ears, filling heir
coffers, feeding their children, and thus motivating them onward to higher
and higher levels of foolish behavior for at least 10 years, so being
well-conditioned to act foolishly, they bravely soldiered on.