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R9 1K
L VU
R4
R6
C3
R2
24.9K
24.9K
1.0
1K
1
1
R8
U1B
L IN1
30.1K
TL072
1
6
+12V
C1
7
100PF
5
8
R5
2
R3
24.9K
1
1K
1
L IN2
3
U1A
TL072
4
C4
R7
1.0
24.9K
C2
-12V
1
100PF
R12
20K
1
U3
13
12
X
X0
14
X1
3
15
Y
X2
11
X3
+5V
16
1
+5V
Y0
5
Y1
7
2
-5V
Y2
4
R10
R11
Y3
8
6
INH
47K
47K
10
A
9
B
74HC4052
/+12DB
/+6DB
R49
R48
20K
1
R VU
1K
C15
R40
R42
R44
1.0
1K
24.9K
24.9K
R IN1
+12V
C13
100PF
R47
8
30.1K
C16
2
R43
R41
1
6
1.0
1
1K
24.9K
3
R IN2
7
5
U2A
4
TL072
U2B
C14
TL072
R45
100PF
-12V
24.9K
R119
4.7K
+12V
C36
.01
8
2
1
2
3
6
IN
VO
R120
U18A
100
U17
4
TL072
REF02
-12V
4
5
R118
GND
TRM
10.0K
R121
1
10.0K
1
C37
.01
R122
6
100
7
5
U18B
TL072
+12V
+12V
C44
C42
C40
0.1
0.1
1.0
C8A
OPEN
C43
0.1
C45
C41
0.1
1.0
-12V
-12V
J1
J2
L IN1
1
2
10
L IN2
R OUT
3
4
8
R IN1
5
6
6
R IN2
L OUT
7
8
4
9
10
2
L LP1
11
12
L LP2
RECEPT 5X2
13
14
R LP1
15
16
R LP2
17
18
19
20
RECEPT 10X2
Reference Drawings
GAIN REDUCTION VOLTS P-P
THRESHOLD
1.1
10DB
3.5
20DB
11
R20
C5
+12V
.047
75K
1
L LP2
AD632
14
U4B
L LP1
7
TL072
9
6
U5
13
7
R1
5
12
100
11
3
C6
R13
2.0K
.047
R17
1
360K
-12V
R14
1.0K
1
R15
499
1
R56
75K
1
R16
+12V
499
1
U4A
8
+12V
C17
C18
TL072
2
.047
.047
1
AD632
R LP2
3
14
7
1
R LP1
4
9
U6
13
-12V
R46
10
12
360K
R98
11
3
100
-12V
R50
2.0K
1
R51
1.0K
1
R52
499
1
R53
499
C50
1
47PF
-5VDC at 0DB GR
4.1V at 20 DB GR
+5.00V
+5V
VDD
+5V
+5V
C38
C46
C47
1.0
0.1
0.1
R79
R78
49.9K
91K
1
VEE
Q5
LM394
8
1
8
C
1
7
2
7
B
2
7
6
3
6
E
3
5
4
VSS
5
4
-5V
-5V
C39
C48
D20
1.0
0.1
R80
3.3K
C20A
OPEN
C25
100PF
J3
+12V
1
2
-12V
6
3
4
/+6DB
7
5
6
/+12DB
5
7
8
L VU
U13B
9
9
10
R VU
TL072
7
11
12
5
+5.00V
13
14
3
PROC A
15
16
1
PROC B
17
18
PROC C
19
20
BR GR
21
22
HI GR
23
24
TEST
25
26
RECEPT 13X2
GAIN: U5, Pin 2 to U8, Pin 2
(No Hi-band gain reduction)
FLAT
A=0
25uSEC A=0.33
R23
50uSEC A=0.67
100K
1
1
75uSEC A=1.0
(+/-5.0V PK)
2
10
D2
R22
R26
11.3K
R24
100K
1
24.9K
1
PRE-EMP.
D1
Q1
R28
C8
2N5087
OPEN
R29
1.0
10K
POLY
R25
24.9K
1
R30
49.9K
6
1
7
5
U7B
TL072
R59
100K
1
(+/-5.0V PK)
2
D8
R58
R62
11.3K
R60
100K
24.9K
1
R64
OPEN
D7
C20
PRE-EMP.
1.0
R61
R65
POLY
24.9K
10K
Q2
2N5087
+12V
R66
R123
8
49.9K
50K
2
1
1
U7A
3
R90
TL072
1K
4
-12V
C29
R87
0.1
1
3.3K
2
3
-5V
C27
HEAVY
R85
SW1A
.047
PROC A
0
R88
R83
10M
10K
PROC B
R89
D19
PROC C
330K
LIGHT
R86
POT LOCATED
3.3M
ON DISPLAY PCB
C28
1.0
POLY
SW1B
4
5
6
C26
100PF
D13
+12V
3mV/DB
R91
8
10M
2
R93
1
R92
10K
3
U13A
TL072
1K
4
-12V
R82
C30
120
D15
1.0
D14
Q3
YEL
2N5210
R75
2.4K
R112
49.9K
R111
1
49.9K
1
+12V
8
R113
2
100
6
1
3
7
5
R84
4
U15A
49.9K
TL072
1
U15B
-12V
TL072
R110
49.9K
1
R34
24.9K
1
R31
24.9K
C11
+12V
1
220PF
AD632
C10
1 4
.0027
7
1
R39
POLY
9
1K
2
6
U8
13
7
5
12
10
11
3
R32
U10B
12K
TL072
-12V
R33
10K
R67
R70
24.9K
24.9K
C23
+12V
220PF
AD632
C22
14
+12V
.0027
7
1
R81
9
POLY
8
1K
2
2
U9
13
1
12
3
10
U10A
11
3
4
TL072
R68
12K
-12V
-12V
R69
10K
C49
47PF
+5V
R650
100K
R94
20.0K
1
JP1
R95
HEADER 4X2
20.0K
R97
1
49.9K
FLAT
1
2
1
25uS
3
4
50uS
5
6
75uS
7
8
R96
20.0K
1
Q7
LM394
R101
1
8
10K
1
C
8
2
7
3mV/DB
2
B
7
3
6
3
E
6
4
5
4
5
R100
120
D21
R76
10K
TEST
.25V/DB
R99
R77
3.3K
3.3K
C31
100PF
R115
49.9K
1
6
6
.25V / DB
BR GR
7
7
5
5
R102
49.9K
U14B
U16B
1
TL072
TL072
NOTES :
1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE SPECIFIED.
2. ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED.
3. ALL DIODES ARE 1N4148 UNLESS OTHERWISE SPECIFIED.
+5V
C12
D3
0.1
R38
1K
L OUT
R35
D4
240K
-5V
R36
R37
24.9K
24.9K
U12B
6
TL072
7
5
D5
D6
+5V
D9
C24
R74
0.1
1K
R OUT
R71
240K
D10
-5V
R72
R73
24.9K
24.9K
+12V
U12A
8
TL072
2
1
3
4
-12V
D11
D12
R109
3.3K
C33
R103
.047
0
C34
R104
OPEN
OPEN
C32
100PF
R105
1M
+12V
8
D16
2
R106
R107
1
1K
10K
3
U14A
TL072
4
-12V
C35
D17
1.0
D18
560
-5V
R116
49.9K
1
+12V
8
R117
2
100
1
0.25V / DB
HI GR
3
4
U16A
TL072
-12V
R114
49.9K
1
SCM, FM AUDIO PROCESSOR
Audio Processor
103202
6–5
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