SLEEVE
RING
TIP
JK3
231
231
J1
SLEEVE
RING
TIP
JK8
JK5
231
(rear)
(front)
231
JK6
SH
2
3
1
JK7
R
RS
TS
T
SS
S
SH
2
3
1
RS
TS
SS
2N4401
470uF
25v
2200uF
150
R23
510
R35
150
R143
Q11
C27
2N4403
Q3
2N4403
Q24
2N4403
Q12
2N4401
Q8
Q25
2N4401
C67
470uF
25V
510
16V
C20
C-TAPER10K
RP4/A
+FILT-L
330
R20
2N4401
R132
10
Q26
C85
22uF
25V
2N4403
16V
Q30
C78
R18
10K
R24
-
+FILT-R
R155
330
2200uF
-
1
3
INPUT
GAIN
10K
R153
2.2K
R19
C-TAPER10K
2N4403
2N4403
R138
330
R21
Q9
2N4403
2
RP1
Q6
2N4403
C84
22uF
25V
R114.99K
L_MIC
R104.99K
C16
C17
Q10
100pF
R7
2.21K
R610.0K
8
2
1
U1
3
NE5532
+
4
-
100K
R22
C23
25V
470uF
120K
R4
Q7
150
R32
6.8K
Q5
2N4401
R33
510
R34
2N4403
33pF
R52.21K
8
6
-
5
7
NE5532
+
4
-
R2524K
R152
2.2K
R154
330
Q29
2N4403
R15610
R1484.99K
R-MIC
R1474.99K
C65
Q27
2N4403
510
Q28
R142 150
Q22
2N4401
C66
100pF
R12010.0K
8
2
1
U5
3
NE5532
+
6.8K
R137
-
2N4403
Q21
4
-
100K
R135
C71
470uF
25V
R13624K
2.21K
120K
R134
R131
33pF
R1232.21K
8
6
-
5
7
NE5532
+
4
-
MM
10/3/03
10/3/03
DATEAPPROVALS
C
DRAWN
ENGINEERING
MANUFACTURING
CHECKED
ISSUED
PLOT DATE
LAST
USED
C87
R168
CR44
Q30
U6
LI2
JK6
RP4
SW8
JP67
J15
APPLIED RESEARCH & TECHNOLOGY
215 TREMONT STREET
ROCHESTER, NY 14608
Dual Mic Preamp II
MIC INPUT SECTION
DWG NO.SIZE
255-4001-104
FILENAME
255-1-4.SCH
REV
A
SHEET
OF 3
1
R44
47K
+48V
1N4003
CR35
R144100K
100pF
R36 20K
OUT-L
R117
47K
R-OUT
+48V
R17
+
20K
+
R37
470K
(OPEN)
2N4401
2N4401
Q2
2N4403
Q4
R151
Q23
2N4403
Q20
R150
470K
+48V
63V
63V
CR11
CR8
1N914
C19
+
U2
-
100uF
+
U6
-
100pF
R16100K
1N4003
C13
C14
+
-
100pF
R157100K
1N4003
CR36
100uF
-
+
+
11
4
-
1N4003
100pF
TL074
CR38
1N914
C74
TL074
R149
C77
R13100K
63V
SW2
+48V
SW7
63V
C76
14
R481K
C18
4.99K
100uF
1
2
3
SLV
63V
C29
R45 4.99K
R46
100pF
C81
L_MIC
CR12
CR9
+
1N914
R910
100uF
R1210
100uF
R8150
-
+
RP5
A-TAPER 5K
R38
R3
CR13 1N914
1N914
C-TAPER10K
5
63V
1M
1K
CR10
47 R144.99K
R15
R1391K
C75
CR37
-
-
+
1N914
4.7uF
50V
C15
-
220uF
+
C86
6.3V
1
2
3
SLV
4
6
4.99K
100uF
C72
R141
R140 4.99K
R15810
R14610
R145 150
R
R-MIC
T
S
R129
220uF
C87
6.3V
RP4/B
100pF
C73
RP6
A-TAPER 5K
R128
1M
100pF
C83
-
+
4.7uF
CR33
1N914
50V
C70
1N914
12
CR34
13
R130
4.99K
47
1K
C-TAPER10K
+
TL074
BIT0
BIT1
BIT2
BIT3
COMMON
open
C63
HIGH-A
WARM-A
R163
100K
LED-L
-
SW8
LOW-A
OPL-A
8
SW5
R109
CH2
+20dB
GAIN
3.3K
3.3K
4 BIT ENCODER
BIT0
BIT1
BIT2
BIT3
COMMON
SW4
220uF
Q17
J111
6.3V
C24
.047uF
50V
C48
R89
R73
51K
R39 10K
C26 4.7KC26C25 4.7KC25
R40 OPEN
+
4
13
TL074
-
U2
12
+
11
R41
-
5.1M
+
11
U6
7
TL074
4
-
R126
OPEN
C57
C57
C56
C56
4.7K
R125
5.1M C54
OUT-R
R124 .1uFR124
14
OUT-L
+
-
R31
R30
R27
0
OPEN
R26 .1uFR26
5
6
R112
10K
WARM-B
4.7K
C55
.0068uF
R93
R92
R90OPEN
0
R91
10K
OPEN
R94
10K
+
4
9
TL074
-
U6
10
+
11
-
OPEN
HIGH-B
8
R2810K
LOW-B
R164
OPL-B
100K
.0068uF
C35
R29 10K
9
-
10
+
R101
C60
6.3V
220uF
+
4
U2
11
-
4 BIT ENCODER
OPEN
+
R118
1.5K
R119
20K
R106
220
R54 OPEN
open
C34
Q14
C37
6.3V
R42
1.5K
R43
220
CR29CR29
WARM-B
6.3V
220uF
-
10M
.033uF
C49
-
R67
10M
220uF
C47
35V
R104 3.3K
R105
150
C40
50V
C41 .033uF
J111
WARM-A
SW1
CH2
+20dB
GAIN
R87
22uF
J8-2 J12-2
C52
330pF
220uF
C53
.047uF
R7420K
OPEN
-
1N4148
R111 100
J12-3
R110
6.3V
2.2K
R69
J1
1N4148
C36
35V
150
CR26
7
8
J12-1J8-1
51K
22uF
6.3V
R86
2N4403
J8-3
6
5 9
FIL-A
J12-5
J8-5
R75
220uF
C42
R85200K
CR25
20K
CR18CR18
3.3K
OPEN
Q18
150
330pF
22uF
C51
R100
47K
OPEN
OPEN
1N4148
1N4148
+TUBE2
50V
OPEN R167
CR24
1N4148
R65
R66
1N4148
CR23
-
Q132N4403
R165
20K
R78
R79
J12-9J8-9
C46
R822.2K
J12-10
J8-10
TUBE1
J12-8
J8-8
2
J12-4
J8-4
200K
+TUBE1
1
3
4 9
FIL-A
27
4.99K
(OPEN)
22uF
C39
R77
47K
R64
20K
R63
2.2K
R62
2.2K
R68
C38
22uF
50V
R80
+48V
R83
50V
1N4148
2
-
3
CR14
+
47K
1N4148
R841/2WAT
MPSA29
Q16
4
U2U2
11
CR15
+
TL074
-
22uF
C22
CW
B_TAPER
RK09HD
10K
CCW
CH1
OUTPUT
LEVEL
R76
-
25V
1
L-LOOP
C21
6.3V
220uF
RP2
4.99K
R55
10.0K
2
3
CR20
1N4148
10.0K
6
5
20K
C30
C32
R61
-
+
-
+
U3U3
33pF
8
U3
4
1N4148
CR22
33pF
R59
+
8
4
-
R57
+
-
NE5532
C33
35V
NE5532
-
1
+
7
CR19
1N4148
22uF
C31
1N4148
+
-
CR21
150
R56
R58
20K
PHASE
SWITCH
N.C.
COM
N.O.
SW3
JK-3
3
21
TIP
RING
SLEEVE
JK-2
R51
150
R60
22uF
20K
35V
R88
R95
2.2K
R166
R108
4.99K
C50
50V
+48V
Q19
MPSA29
R127
47K
CR27
CR28
2
3
1N4148
CR31
R96
2.2K
20K
OPEN
R168
R168
22uF
R107(OPEN)
+
4
TL074
1
U6U6
+
11
CR30
1N4148
+
R97
-
22uF
C69
CW
CCW
CH2
OUTPUT
LEVEL
R-LOOP
25V
A-TAPER
RK09HD
10K
RP3
CR43
1N4148
+
CR41
150
CR44
R114
1N4148
CR42
R115
-
N.C.
SW6
COM
N.O.
DRAWN
ENGINEERING
MANUFACTURING
CHECKED
ISSUED
PLOT DATE
PHASE
SWITCH
12-16-02
MM
12/16/2002
DATEAPPROVALS
APPLIED RESEARCH & TECHNOLOGY
DUAL MIC PREAMP
ANALOG PROCESSING
C
FILENAME
255-2-4.SCH
255-4002-104
+
-
C62
33pF
R113
20K
+
8
2
1
U4
3
NE5532
R116
6.3V
+
4
-
R102
10.0K
4.99K
C58
10.0K
6
5
33pF
R99
+
8
7
U4U4
NE5532
+
4
-
C68
220uF
35V
C59
1N4148
150
R103
22uF
35V
C61
20K
1N4148
22uF
R98
20K
SLEEVE
215 TREMONT STREET
ROCHESTER, NY 14608
SHEET
RING
TIP
2
JK5
OF 3
JK4
3
21
REVDWG NO.SIZE
A
2.4K
L-OUT
R210
100uF
C7
J2
J3
J1
Q200
C202
100K
J7-2 J7A-2
-
100V
CR1
CR2
1N4003
1N4003
2N4403
.1uF
R208
L-
J7-5
+
J7-3 J7A-3
J7-4
1N4003
1N4003
3
-
10
100K
CR4
CR5
13
U200
47K
R201
J7A-5
J7A-4
11
1N4003
CR6
LI205
LM339AN
+
R206
R1
CR3
1N4003
10K
100uF
C6
100V
+RAW
1000uF
1000uF
C9
C3
C3
35V
1000uF
C2
C2
35V
T1
RED
14
L+
L-
3
12
-
8
3.3K
100K
4
-
5
+
35V
LM339AN
U200
+
9
R202
U200U200
1000uF
C10
C11
R204
3
12
1000uF
LI204
12
L+
LM339AN
35V
35V
YELLOW
L+
L-
7815
VR1
-1,2
JP13
+RAW
22uF
35V
C12
VR2
7915
T1
LI203
-
T1
GREEN
1
LM339AN
L+
L-
2.2K
6
7
3
12
U201U201
+
4
7
R205
L+
3
-
U200
+
LM339AN
12
R200
(OPEN)
3
-
6
2
100uF
C8
-
2.2K
1
R2
10K
CR7
100V
1N5261B
+
22uF
C5
35V
R70
20K
470uF
C45
LI202
T1
GREEN
LM339AN
R207
1K
12
R203
14
L+
L-
3
U201
-
8
9
2.2K
2
U201
+
5
LM339AN
+
R209
35V
LI201
12
1K
GREEN
L+
L-
Q1
TIP112
+48V
10K
R72
+TUBE1
100uF
63V
C44
Q15
2N4401
R81
T1
13
3
-
10
50V
U201
11
C200
.47uF
orange
orange
rect.
LI200
LM339AN
12
+
R211
1K
100uF
C43
GREEN
R71 10K
63V
T1
L-LOOP
+TUBE2
LI1rect.
LI2
L-
R49 100
1N270
CR16
R160 1K
J7A-1
J7-1
47uF
15V
C28
-
J13-8
M1
VU meter
-+
1.5K
CR39
R159
1N4148
LAMP2LAMP1
J6-2
J6-1
R50
47
R47
47
L+
2.4K
R-OUT
R224
J10-2
C203
+
-
J10A-2
J10-5
2N4403
13
.1uF
LM339AN
3
U202
-
+
10
11
47K
R221100K R219
R213
100K
J10A-5
J10-3
J10A-3
J10-4
J10A-4
RED
LI212
12
YELLOW
T1
LI210
14
LM339AN
R+R-R-
R-
3
12
U202
-
+
8
9
3.3K
R217
R214
100K
R+
3
4
-
U202U202
5
+
LM339AN
12
GREEN
T1
LI209
1
LM339AN
R+
R-
3
12
U203U203
-
+
6
7
2.2K
R218
3
6
-
U202
7
+
12
2
R+
LM339AN
GREENQ201
T1
LI208
2
LM339AN
R+
R-
3
12
U203
-
+
4
5
2.2K
R220
1K
R216
1
(OPEN)
R215
GREEN
T1
LI207
14
R+
LM339AN
3
12
U203
-
+
8
9
2.2K
R222
R+
GREEN
T1
R+
R-
3
-
10
50V
T1
LI206
13
LM339AN
U203
+
11
R-
M2
R162
J10A-1J10-1
1K
12
R-LOOP
CR32
1N270
100
R133
CR40
47uF
15V
C64
R122
47
47
R121
1.5K
R161
1N4148
VU meter
J9-2
-+
LAMP2LAMP1
J9-1
C201
R223
1K
.47uF
DRAWN
ENGINEERING
MANUFACTURING
CHECKED
ISSUED
PLOT DATE
12-16-02
MM
12/16/2002
DATEAPPROVALS
APPLIED RESEARCH & TECHNOLOGY
DUAL MIC PREAMP
ANALOG PROCESSING
C
FILENAME
215 TREMONT STREET
ROCHESTER, NY 14608
255-4003-104
SHEET
OF 3255-2-4.SCH
3
REVDWG NO.SIZE
A
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