2.4 FREQUENCY CHARACTERISTICS
The frequency characteristics of
the
preampl ifier with
1/2"
and
1"
micro-
phones are shown
in
· Fig.2.4. The low frequency response depends on
the
capacity connected across its input. Typical curves are shown
in
Fig.2.5.
75
.
61
.
T
.1.132
o·
+26
1U
13
m
Vl
,IJb
cr
...
~
• . IVfu
,
+
1
~
Typ.
"ll,
()<>
-6
0
"2614115
Prt
ssu
re
mlcr
o
phon.
0.'
-70
0 2
-8
0
0.1
,
"
20
so
10
'
20
so
,,'
2ll
so
",
2ll
so
.1If 2ll
0.
001
0.
01
0.1
10
100kHz
-I,/)
::::
+0
OJ7 ..
2619
""
-,
. 2612{13
m
Vf,/J
b
ar
de
~
• .
ty
/u
+2619
T
y~4
t
33
,.2614(15
Frtt
f i
eld
ml
cro
phon t
(J>
, , .
,.
'"
o
:
P~'",_
ul.'lMod."'.
0.'
Aoft_lft<;OOftU
I'
. 1',
.....
,.,
..........
90:(0
•••
""
...........
0.2
,
-'"
2
10
20
"
10
20
" "
20
SO
10'
20
"
'0
20
° "
0.001
0.01
0.1 1
10
100kHz
f
ll
tt
J
Fig.
2.4
. Frequency responce with 1/
2"
and
1"
microphones.
2.5 GAIN
The gain of
the
2619
is
appro
xi
mately unity,
or
-0.02
to
-0.1
dB
.
2.6 DISTORTION
A typical distortion curve
is
shown
in
Fig.2.6. It shows the limit for 4%
distortion. For normal operating conditions
the
distortion
is
less
than
1
%.
9
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