11
8. BLOCK DIAGRAM
MIC1
MIC2
MIC3
MIC4
ENC
IN
AU
X2
AU
X1
2
-
STA
GE
EQ
BA
SS
TR
EBLE
L
EVEL
P
ro
te
c
ti
o
n c
ir
c
u
it
L
E
D d
is
p
la
y
F
u
n c
o
n
tr
o
l
Amplifier output
L
EVEL
LEVEL
LEVEL
LEVEL
LEVEL
MU
TE
_
MIC1
MU
TE
_
ALL
Q2
GND
MU
TE
_
ALL
Q1
GND
MU
TE
_
MIC1
AUDIO
OUT
S
w
it
c
h
o
v
e
r b
e
tw
e
e
n
a
n
d 1
0
0
V
4
-1
6
Ω
D
C 2
4
V i
n
v
e
rt
e
r
p
o
w
e
r s
u
p
p
ly
s
w
it
c
h
in
g
p
o
w
e
r s
u
p
p
ly
A
m
p
li
fi
e
r
m
o
d
u
le
