From: Watson 'Atto Parsec' Name
Subject: Re: audio line specifications
References: <3DEE2757.EE79B063@crf.canon.fr> <3DEFD744.3A2D8C8D@gv.net>
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Date: Fri, 6 Dec 2002 23:08:18 -0800
NNTP-Posting-Date: Sat, 07 Dec 2002 00:11:00 PST
Organization: InReach Internet
In article ,
> I read in sci.electronics.design that Watson 'Atto Parsec' Name
> wrote (in ach.net>) about 'audio line specifications', on Fri, 6 Dec 2002:
> > It could
> >be only 3 meters long, but if the driver is a crystal microphone, which
> >has a high impedance, then the high end may be rolled off by the few
> >hundred pFs of cable capacitance.
> No, because the crystal microphone it itself a capacitive source. Catch
> 22 pF! (;-)
Well, I said high impedane, which is the vector sum of the resistance
and reactance. If it's high impedance then the capacitance must be very
low. In any case, I could hear the diff between a short cable and a
long cable as far as high end rolloff goes, with the cheap crystal
mikes, or were they ceramic, I forget which.
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