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2
RIGHT AUDIO
751909 SCH 4 of 5
PH
+5 V
D7
6
2
7
1
PH -
8
1 4
PH +
K1
8
14
L1 -
7
1
L1 +
6
2
K2
D5
L1
+5 V
8
14
L2 -
7
1
L2 +
6
2
K3
D6
L2
+5 V
J4:1
3
J4:2
M ONO -
3
J4:3
M ONO +
3
+7 .5V
-3 .5V
C29
C31
.1µF
.1µF
+3 .3V BU
R31
332k
AUD DET
R34
22.1k
C26
1
Q23
.47µF
AUD IO D ETECTOR
U7
3
2
IN
OUT(TAB)
+1 7V
+7 .5V
C25
C30
ADJ
R33
.1µF
220µF
1k
R32
1k
+5 V A D C
D4
5.1V
R30
100
+1 7V
+1 2V M
C27
C28
220µF
.1µF
15
R41
200
R39
22.1k
MUTE
R44
475k
R40
22.1k
-1 7V
R42
200
+5 V
D8
K4
MONO
-3 .5V
3
1
B-
U8:1
B+
2
+7 .5V
R35
10k
R36
6
3.32k
7
U8:2
+7 .5V
5
U9
2
3
IN(TAB)
OUT
-1 7V
-3 .5V
C32
ADJ
R38
C33
.1µF
1k
220µF
R37
1.58k
R43
2k
+5 V A D C
C38
R47
R53
R64
47µF
1.58k
200
2k
C42
330pF
+1 7V
SOF T M U TIN G
U11
8
V +
R46
R48
7
5
100k
S
ENA
1M
3
Q24
G D
2
4
Vocm
V -
1
C35
R122
.47µF
1M
HS
C43
-1 7V
330pF
-1 7V
C39
R49
R54
R65
47µF
1.58k
200
2k
R59
1k
R55
-1 7V
2k
2
OUT -
B-
6
U12
R56
B+
2k
3
OUT +
+1 7V
R60
1k
U N BALANCED CONVERTER
C44
.1µF
M ETER LOG AMP
R61
D9
10
R62
D10
10
R50
C37
R52
R63
.01µF
1k
82.5k
82.5k
C36
R51
10µF
1k
6
D11
R66
22.1k
7
U10:2
5
C40
47µF
OUT -
R57
22.1k
14
8
V BIA S
1
7
2
6
K5
C34
R58
R45
D12
100µF
22.1k
1.2k
C41
47µF
OUT +
+5 V
C50
C55
47µF
22µF
OUT +
R67
10k
+1 7V
-1 7V
C45
C48
R78
.1µF
.1µF
4.75k
14
8
1
7
2
6
K7
R68
R79
4.75k
10k
C51
C56
47µF
22µF
OUT -
+1 7V
-1 7V
D17
C46
C49
OUTPUT
+5 V
.1µF
.1µF
K8
C52
C57
3
2
47µF
22µF
4
1
R69
R80
10k
4.75k
+1 2V M
-3 .5V
C47
.1µF
M ETER D R IVER
+1 2V M
+1 2V M
2
D15
B+
1
1
U10:1
Q26
B-
3
D13
Q25
D16
-3 .5V
2
3
1
C53
R70
R77
METER CALIBRATION
.1µF
2.21M
221
Apply 1kHz input and adjust the
C54
MP1100 unbalanced output
-3 .5V
.47µF
to 2.0V. Adjust R81 for 0dB
on the meter.
R71
R244
CCW
332k
47.5K
3
1
R72
R81
100k
332k
R73
10k
+7 .5V
R74
47µF
2200pF
3k
C141
2
B+
1
AD C FILTER
U13:1
B-
3
-3 .5V
14
8
V BIA S
1
7
2
6
K6
D14
5
7
U13:2
R75
3k
6
2200pF
+5 V
R76
47µF
10k
C142
16
R89
100
2
+
R IGHT
3
-
BALANC ED
OUTPUT
1
G
R82
22.1k
D20
J7
R83
22.1k
R90
100
D18
R91
J8
100
R IGHT
1
U N BALANCED
OUTPUT
R84
D19
22.1k
+1 2V M
Q27
R92
3.32k
MET +
R93
0
MET -
R85
C145
1.58k
1000pF
C58
R248
10
ADC +
R86
75
+7 .5V
-3 .5V
C60
C61
.1µF
.1µF
R87
R249
75
10
ADC -
C59
C146
1000pF
R88
1.58k
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