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R101 N1 R102
+9V
10K 4.99K

R103 + C101 + C102

47 X 47 X
100K 10V 10V +5V
N2

C103 + R106 AUDIO OUT TO RF

R105 PIN 9 OF U101
1.0 X 100K 49.9K R104
16V +9V 100K I9
MC33179DR2
AUDIO IN I4 R107 N9
24.9K C104 + C107 P101
P102 C105 12 4 C130 + 4
N5 R110 N14 5 N3 1.0 X N6
4

6
4 55A178
150pF 16V N8 4.7 X16V

3 S102
N4 499 U102 C U102 A 14
P102 .1 C131 C113 7 + C106

5
188A49 1.0 X 188A49
150pF 150pF R109 10 R111
P101 16V
13 11 249
1 6 402K U102 B 8
N24
P101 R112 N7 C108 188A49
+9V N55 C110 N16 N12 N13 R113 R114
+9V TO MIC R142 11
P101 + 16.5K R115 N15 9 N10
12 4.7 X 16V 10K 7.5K
3 –
N23 2.0K 1.0 X16V C111 10 + C109 C112
P101 2.0K N17
R116 R117 + 4.7 X
2 16V
1K CW .0039 24.9K 330pF
SHIELD I19 188A01
N19 3 R125 1 N18 R118
P102 14
1 R119 20K LOG TAPER G 10K
N21 C115
1K GAIN
P102 + C116 + C117
4.7 X N20 U101 A C118 .0015 C119
1.0 X
P102 16V 16V 4.7 X 16V + 4.7 X 16V +
+ C121
3 C120 15
P102 4.7 X16V N26
* N25 R122 +5V R123
R124 R140
75K 1K 1K N27
N28 0 N29
16 9
N51 R126 N30
C123 + R127 R128 183A01
+9V TO RF I33 60.4K
1.0 X16V C124 Q103 Q104
P102 183A01 N32 1.5K 1.5K
N33 150pF
2 N54
P102 R129 N34 CW R141
N35
+9V 10K 20K 10K
183A07 +9V R130
N38 AUDIO
Q105 +5V + C125
1.0 X
2 3 L101 C126 16V
1 S101 + C127
6 55A178 N36 162A03 4.7 X .001
N39
5 4 16V
L102 R131
N40
4.02K
R132 FUNCTIONAL TEST POINTS:
J101 1.8uH N41
+ 3.01K N42 N43 +5V I47
N44 6
R133
+5V TO RF I4 = AUDIO INPUT
+9V GREEN I9 = AUDIO OUT TO RF BOARD
I40 R134 R135
R136 D101 RED 5 13.3K R137 P101
3.01K 7 N46 N47 2 I19 = Vcc TO MICROPHONE
L103 6.19K D102 49.9K
N49 100 I33 = Vcc TO RF BOARD
L104
J102 N50 +5V I47 = +5V DC TO RF BOARD
1.8uH 188A01
N45 N52 N53 +9V I40 = Vcc INPUT (+9V DC)
Q106 Q107 C128
I45 3 I45 = GROUND
183A02 183A02 G 150pF
R138 13
681 R139 U101 B
C129
1K
150pF
4 2

AUDIO
GND
GROUND

1 8
E 1999, Shure Brothers Inc.
27B1018 (SB) T2 Earlier Version Audio Board