Re: Basic questions about microphones and mic preamp design...
From: John Woodgate (jmw_at_jmwa.demon.contraspam.yuk)
Date: 12/13/04
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Date: Mon, 13 Dec 2004 09:03:04 +0000
I read in sci.electronics.design that Robert Baer
<robertbaer@earthlink.net> wrote (in <41BD526D.FE183D05@earthlink.net>)
about 'Basic questions about microphones and mic preamp design...', on
Mon, 13 Dec 2004:
> Any "micropnone" that has an audio output signal of 500mV already has,
>by definition, an amplifier stage built in, and that level is
>essentially LINE LEVEL.
The source follower or common-source stage in an electret microphone can
only just be described as an 'amplifier'; it converts the capacitive
source of the capsule, 2.5 to 10 pF, to a manageable lowish impedance (1
kohm to 5 kohm). But with a suitable supply voltage (e.g. 12 V), such a
microphone can produce several volts if placed close to a brass
instrument.
-- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
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