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REVISION DESCRIPTION ECO# DATE REVISION DESCRIPTION ECO# DATE
A0 SCHEMATICS CONVERTED FROM DBX FILES TO ORCAD
X0 PROTOTYPE CONVERTED PCB 8/19/94
B0 RELEASE TO PRODUCTION PCB FILES CONVERTED TO PROTEL 9/21/94
B1 CHANGE 72-4262 TO 72-4062, CHANGE 724261 TO 72-4067 1378 04/04/97
B2 CHANGE 50-2442 TO 50-0307, ADDED 44-0157 1579 05/21/97
CHANGE TP1 AND TP2 FROM 36-0095 TO 50-0317 AND MOVE TO
B3 196 10/13/98
THE 12-6172-B3 ASSEMBLY.
|LINK
|056172B3.001
dbx PROFESSIONAL PRODUCTS
8760 South Sandy Parkway
Sandy, Utah 84070
Title
DBX 903 COMPRESSOR/LIMITER MODULE 80-6172
Size Document Number Rev
B 056172B3.000 B3
Date: Thursday, March 23, 2000 Sheet 0 of 1
P1
PA15
1 -24V
2
3 +24V
AUD_IN-
4 AUD_OUT-
5 AUD_OUT+
+15V
6 AUD_IN+
7 -15V
RMS_IN-
8 RMS_IN+
9 CV_IN
10 CV_OUT
11
12 R30
13 JP2
0 20.0K 1%
14
15 JP1
0 R18 C6 C13
TP1 4.99K 1% .01MD +24V 22S63E1
R3 R7 R13 +15V
M1
0-R 1.00K 1% 10.0K 1% 7.50K 1% +24V
R24 R28 Q1 S1A
3
C7 -15V 2.21K 1% 5.62K 1% 2N3440 SW440146
C1 2 1
.01MD IN
100PK1KD 2
C11
5
7
3
C5 R26 3
1
2 10NPM25E 100PK1KD 2.21K 1%
R4 R8
1 1 8
1.00K 1% 10.0K 1% 3 U1
DBXV1A OFFSET C12
U5A R15 S1B
LF353 TRIM 1S63E1 R31
H1 13.7K 1% U4 SW440146
4
2
4
6
1 33 4
+24V LF351
7
2 C2 -15V +15V +15V R77 5 IN
-24V R11
3 100PK1KD 7.50K 1% +15V OPTION 2 6
7
1
4 R17 R20 750K 6
1
5 R9 R14 2 374 1% R22 2 3 R33
6 +15V R16 150K 1%
2 6 OPTION
100K 1% 75.0K 1% R32 20.0 1% S1D
-15V 50K420279 U3 50K
7 3 R23 33 SW440146
3
4
1
5
8 VCA SYM LF351 0 10
R5 R21
3
9 +15V R19 -15V 11
10.0K 1% C3 49.9 1%
4
1
5
-15V 49.9 1% C14 12
100PK1KD R27
8
1
-15V 22S63E1
2.21K 1%
R6 6 R42 2
R10
HDR321182 7
10.0K 1% 100K 1% 4.64K 1% R29 Q2
5 +24V
C10 R25 2N4036
3
5.62K 1%
U5B R36 .001K1KD1 2.21K 1% R34
R12 +15V -24V
C4 LF353 2.21K 1%
75.0K 1% OPTION R39 JP3
100PK1KD R35
1
3.3M 0 -24V
OPTION 24.9K 1%
2 S1C
50K SW440146
GAIN CAL C15 NOTE: R22, R77, R35 & R36 ARE OPTIONAL. 7
D7
3
C16 68PK1KD REPLACE R23 WITH 2.61K 1% 8 IN
R44 LEDR702098
1J50FD -15V FOR OPTIONAL CONFIGURATION. 9
10.0K 1% IN
U7A
+24V 4558D
+15V 2
R38 1
1
3
R37 374K 1%
C19 D10 2 R41
10S63E1 1N4004 20K402106 1.00K 1% 1 J1A
-15V
4
OUTPUT HCN323159
R73
3
-15V 24.9K 1%
C20 D11 -15V R40 2 J1B
10S63E1 1N4004 49.9K 1% +15V
HCN323159
R66 C23
3 J1C
49.9K 1% 68PK1KD HCN323159
-24V -15V
R45 R54 R56 +15V
3
+15V 20.0 1% R53 232K 1% 255K 1% OFFSET 4 J1D
+24V
8
20K402106 2 TRIM HCN323159
+15V
THRESHOLD 6
R57 R60 7 5 J1E
R46 50K420279
1
C17 D8 12.4K 1% 5 HCN323159
10S63E1 1N4004 47.5K 1% R74
+15V +15V
U7B 1.00K 1% TO LED BOARD
R61 R63 4558D
1
R48 THRESH R58 R59 5.6M 165K 1%
1
C18 D9 24.3K 1% CAL +15V 100K 1% 2
R47 12.4K 1%
10S63E1 1N4004 2 R55 RATIO
50K420279 R52
1
50K420279 750K TP2
3
RMS TRIM 2 -15V +15V +15V INF+
U6A
3
LF353 0-R -15V
8
1
-15V -15V U2 2 R76
3
4 3 1 6 2 2
SYM GND R64A 1.00K 1%
1 7 -15V 3 7 20K402103 1
2 IN OUT 6 R62 5 R71 3
BIAS CAP
4
3
8 5 10.0K 1% 2.21K 1% U8A
V+ V-
4
R49 U6B 5 4558D
4
22M 1253 -15V LF353
+15V -15V
6
R163 +15V C36
R51 R64B
1
620 -15V 1S63E1
1.00M 1% 20K402103 R69
R50 +15V C21 2 +15V D14
C35 R65
8
1U 6.19K 1% LEDR702098
768K 1% 5K420285 R68
1
1S63E1 6 C34 R67
50K420279 22.1K 1%
3
7 22S63E1 INF CAL 2
5 U8B C22 INF LED CAL
1U R72 R75
4558D R70
3
-15V 1.00K 1% 680K
13.0K 1%
+15V +15V +15V +15V +15V +15V
-15V
SC1 I1
C24 C25 C26 C27 C28 C8
SC440157 .1MM2 .1MM2 .1MM2 .1MM2 .1MM2 .01MD INS706008
I2 dbx PROFESSIONAL PRODUCTS
-15V -15V -15V -15V -15V