DBX 903 Schematic
ECO# DATE ECO# DATEDESCRIPTIONREVISIONREVISION DESCRIPTION
A0
X0
B0
B1 CHANGE 72-4262 TO 72-4062, CHANGE 724261 TO 72-4067 1378 04/04/97
B2 1579 05/21/97CHANGE 50-2442 TO 50-0307, ADDED 44-0157
B3
B4 CHANGE OP AMP PARTS FROM 72-4314 TO 72-4024 326 1-25-99
SCHEMATICS CONVERTED FROM DBX FILES TO ORCAD
PROTOTYPE CONVERTED PCB
RELEASE TO PRODUCTION PCB FILES CONVERTED TO PROTEL
CHANGE TP1 AND TP2 FROM 36-0095 TO 50-0317 AND MOVE TO
THE 12-6172-B3 ASSEMBLY.
8/19/94
9/21/94
196 10/13/98
|LINK
|056172B4.001
dbx PROFESSIONAL PRODUCTS
8760 South Sandy Parkway
Sandy, Utah 84070
Title
DBX 903 COMPRESSOR/LIMITER MODULE 80-6172
Size Document Number Rev
056172B4.000 B4
B
Wednesday, October 20, 1999
Date: Sheet of
0 1
P1
PA15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
M1
H1
HDR321182
1S63E1
-24V
+24V
+15V
-15V
RMS_IN+
RMS_IN+
CV_IN
CV_IN
CV_OUT
CV_OUT
TP1
0-R
1
2
3
4
5
6
7
8
9
C19
10S63E1
C20
10S63E1
C17
10S63E1
C18
10S63E1
+15V
C35
+24V
-24V
+15V
-15V
6
5
+24V
-24V
+15V
-15V
U8B
D10
1N4004
D11
1N4004
D8
1N4004
D9
1N4004
8
4558
RMS_IN-
RMS_IN-
JP2
0
R5
10.0K 1%
R6
10.0K 1%
100PK1KD
7
C4
R4
1.00K 1%
R47
50K420279
RMS TRIM
JP1
0
R3
1.00K 1%
100PK1KD
C2
R9
100K 1%
C3
100PK1KD
R10
100K 1%
R12
75.0K 1%
+15V
R49
22M
C22
1M50E1
C1
100PK1KD
R44
10.0K 1%
-15V
R50
768K 1%
AUD_IN-
AUD_INAUD_OUT-
AUD_OUTAUD_OUT+
AUD_OUT+
AUD_IN+
AUD_IN+
R7
10.0K 1%
R8
10.0K 1%
47.5K 1%
R48
1
24.3K 1%
2
3
-15V
R14
75.0K 1%
6
5
C16
1J50FD
R45
20.0 1%
R46
4
1
2
8
R11
7.50K 1%
+15V
8
LF353
U2
SYM
IN
BIAS
V+
1253
+15V
U5B
R13
7.50K 1%
2
3
-15V
7
R37
20K402106
OUTPUT
C21
1M50E1
4
GND
OUT
CAP
1
U5A
LF353
R35
OPTION
50K
GAIN CAL
R53
20K402106
THRESHOLD
3
7
6
5
V-
SC1
SC440157
R16
50K420279
+15V
-15V
THRESH
CAL
R52
50K420279
-15V
R18
4.99K 1%
+15V
C7
C5
10NPM25E
VCA SYM
1
3
-15V
.01MD
1
DBXV1A
R15
13.7K 1%
+15V
1
R17
150K 1%
2
3
R21
49.9 1%
-15V
4.64K 1%
R36
+15V
OPTION
R39
3.3M
24.9K 1%
C15
68PK1KD
4558
2
3
-15V
R40
49.9K 1%
C24
.1MM2
C29
.1MM2
R57
12.4K 1%
R58
12.4K 1%
2
3
-15V
R56
255K 1%
LF353
R54
232K 1%
2
R55
750K
2
C34
22S63E1
+15V +15V +15V +15V +15V
-15V -15V -15V -15V
-15V
R38
374K 1%
2
R51
1.00M 1%
1
2
3
-15V
3
1
+15V
1
3
-15V
-15V
3
5
8
U1
6247
R42
U7A
1
R41
1.00K 1%
4
+15V
U6A
1
D13
4
1N4148
C25
.1MM2
C30
.1MM2
2
3
JP3
0
-15V
C26
.1MM2
C31
.1MM2
C6
.01MD
+15V
U3
-15V
7
415
R59
100K 1%
R30
20.0K 1%
C13
+24V
R24
2.21K 1%
C11
100PK1KD
OFFSET
TRIM
R77
+15V
OPTION
R20
374 1%
6
LF351
R19
49.9 1%
OFFSET
TRIM
R60
50K420279
+15V
R61
1
5.6M
2
C27
.1MM2
C33
.1MM2
3
-15V
R62
10.0K 1%
-15V
C28
.1MM2
C9
.01MD
TP2
0-R
R22
OPTION
50K
6
5
R64B
20K402103
+15V
1
750K
2
R23
3
0
-15V
C10
.001K1KD1
NOTE: R22, R77, R35 & R36 ARE OPTIONAL.
REPLACE R23 WITH 2.61K 1%
FOR OPTIONAL CONFIGURATION.
49.9K 1%
R63
165K 1%
+15V
8
7
4 6
5
U6B
LF353
5K420285
INF CAL
C8
.01MD
1
2
R65
3
INF LED CAL
I1
INS706008
I2
INS706008
PCB1
80-6172-B
U4
LF351
2
3
R66
R163
620
R67
50K420279
-24V
415
7
2.21K 1%
R25
2.21K 1%
C12
1S63E1
6
R27
R64A
20K402103
R26
2.21K 1%
+15V
6
5
+15V
1
3
R73
24.9K 1%
C23
68PK1KD
8
4558
RATIO
R68
22.1K 1%
2
R70
13.0K 1%
R28
5.62K 1%
D1
1N4148
D2
1N4148
R29
5.62K 1%
7
R74
U7B
1.00K 1%
+15V
1 3
2
R71
2.21K 1%
+15V
R69
6.19K 1%
R72
1.00K 1%
dbx PROFESSIONAL PRODUCTS
8760 South Sandy Parkway
Sandy, Utah 84070
Title
Size Document Number Rev
B
Date: Sheet of
22S63E1
+24V
Q1
2N3440
D3
1N4148
D4
1N4148
D5
1N4148
D6
1N4148
dbx 903 COMPRESSOR/LIMITER 80-6172
056172B4.001 B4
3
2
1
R31
33
R32
20.0 1%
33
C14
1
-24V
D7
LEDR702098
U8A
4
22S63E1
3
IN
-15V
R76
1.00K 1%
1
4558
C36
1S63E1
R75
680K
2
Q2
2N4036
2
3
-15V
Wednesday, October 20, 1999
+15V
+24V
R33
+24V
R34
2.21K 1%
J1A
1
HCN323159
2
3
4
5
TO LED BOARD
D14
LEDR702098
S1A
SW440146
1
2
3
S1B
SW440146
4
5
6
S1D
SW440146
10
11
12
S1C
SW440146
7
8
9
J1B
HCN323159
J1C
HCN323159
J1D
HCN323159
J1E
HCN323159
INF+
IN
IN
IN
1 1
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