[LAU] Audio over WIFI
gheskett at wdtv.com
Sun Jan 18 08:56:08 UTC 2015
On Saturday 17 January 2015 22:12:20 Ralf Mardorf did opine
And Gene did reply:
> On Sat, 17 Jan 2015 22:02:58 -0500, Gene Heskett wrote:
> > Biggest problem with the electret was the 2nd harmonic distortion
> > when driven to higher levels.
> Pff, are you serious? Or you just talking about one special capacitor
Any of them unless they are built with matching but reversed biased from
side to side stationary plates. The capacitance between 2 objects has a
square-law relationship when the distance is varied. Since its a
difficult problem trying to drive the central plate, the diaphragm, the
movable by air pressure plate when its in close proximity to a stationary
plate on both sides, they are are built only with a stationary back plate.
As long as the spacing variation is a small fraction of the overall
spacing, its not too bad, and has even been compensated for by using a FET
preamp with the correct bias etc to introduce a compensating 2nd harmonic
of the opposite polarity.
The electret condenser type has a huge advantage in this case because they
contain their own permanent charge, and its a quite high voltage, so the
spacing can get sloppily large (= cheap to make) and still have adequate
output to drive the FET buffer in it at quite low distortion. Radio Shack
used to sell, for a tenner, a pencil mike that ran the FET on a pair of
AAA cells, and it was pretty darned good for a 10 dollar mic. Way the
heck and gone better than the $60 Shure clones they had at the same time.
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> Linux-audio-user at lists.linuxaudio.org
Cheers, Gene Heskett
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