the
microphone
end
of
the
preamplifier
to
prevent condensation
in
the
cartridge and on
the
insulators.
The
other
end
of
the
preamplifier plugs into
the
CONDENSER MICROPHONE
input
of
the
B&K microphone amplifiers,
etc.,
or
into
the
microphone
power supplies, extension cables,
etc
.
The
preamplifier will also
operate
on
28
V,
120
V,
or
200
V
DC
supplies,
making it a very flexible unit.
2.2
INPUT CHARACTERISTICS
'
The
i
nput
impedance depends
on
the
operating voltage
of
the
preampli-
fier and
on
the
temperature.
Input
resistance: > 4
Gn,
120
V operation
>
2.6
Gn,
28 V operation
Input
capacitance approx.
0.7-0.9
pF
The
input
impedance
of
the
preamplifier varies typically
with
temperature
as shown
in
Fig.2.2,
but
is
still larger
than
3
Gnat
60
0
C.
Maximum
input
voltage:
.
......
2000
1
500
32
V
RMS
(sine)
120
V supply
4 V
RMS
(sine)
28
V supply
'"
i"-.
'"
...
r-
-
~
4 ~
~
~ ~
~
m
~
oo~oo
m
"
'1
.:>
1 0
Fig.
2.
2. Typical variation
of
input
impedance with temperature.
7
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