> I meant to talk of electrets (microphone elements) in general and
> fet's in general, (like 2sk170) but included EM172 e.t.c. which do
> not have fet=B4s "in general" but more complex circuits.
Happy New Year!
I think there is a simple JFET in the EM172. In combination with the extern=
al drain resistor, it is a obviously a straightforward common-source amplif=
ier:
http://www.piclist.com/images/ca/ualberta/phys/www/http/~gingrich/phys395/n=
otes/node91.html
The voltage gain of such an amplifier is deterimined by equation 5.56 (and =
Message: 5.
Subject: 57) in the above link. This means that the gain (and therefore the
output=
signal level) will drop when RD is reduced.
Regards,
Raimund
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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