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REVISION DESCRIPTION ECN# DATE REVISION DESCRIPTION ECN# DATE
A0 RELEASE TO PRODUCTION 4.5.95
|LINK
|056174A0.001
|056174A0.002
dbx PROFESSIONAL PRODUCTS
8760 South Sandy Parkway
Sandy, Utah 84070
Title
DBX 905 PCA PARAMETRIC EQ 80-6174
Size Document Number Rev
B 056174A0.000 A0
Date: Wednesday, October 20, 1999 Sheet 0 of 2
HIGH (800-20KHZ)
+15V
CR1 C3 R78
1N4004 10S63E1 C32 C33
P1 10.0K 1% R79 R80 R85
10.0K 1% 1000PF500F 1000PF500F
PA15 200K 1% 200K 1%
1
-24V
2 HIGH SHELF
+24V
3 +15V C44
-15V
4 1S63E1 S2F
5 CR2 C4 SW440147 +15V
+15V OA11A
6 1N4004 10S63E1
-15V
7 NE5532
7
14
16
18
8
8 1
9 2 8 2 6
10 R1 R2 R3 6 1 7
11 1K 10.0K 1% 7.50K 1% 3 5 3 5
R82A R82B R86
12 AUDIO IN + OA11B
C43 50K402104 R84 50K402104 8.25K 1%
1
4
13 AUDIO IN - R77 OA10 NE5532
NE5534D 22PK1KD 10K R89
4
4
14 AUDIO OUT + 4 C1 +15V C5 10.0K 1% 2 5
15 5 100PK1KD 1S63E1 10K
AUDIO OUT - IN HIGH SHELF -15V
6 C45
S1B 1S63E1
3
6
S2C R88
7
TO OUTPUT MODULE SW440146 DUAL FREQ 1.15K 1%
SW440147
2
4
6
R6 R4 2
J2 1K 10.0K 1% 6
1 3 -15V R81
A OA1 8.25K 1%
10
C2 LF351
2 11 R5 HIGH
B S2D R83
4
1
5
12 100PK1KD 7.50K 1% SHELF
SW440147 1.15K 1% R94
8
10
12
3 S1D
C SW440146 IN 20.0K 1%
EQ OUT C6 R95
4 -15V
D 1 1S63E1 20.0K 1%
R90
5 2
E +15V 20.0K 1%
3 S1A
6 C42
-15V SW440146 +15V
F 1S63E1
7 R93 R53
G CR3 20.0K 1% 2.10K 1%
LEDR702098 R19
8
8
H +24V 1.5K C36 R99 6
+15V
9 4700PH160A 7
I -24V 1M 5
10
J R91A OA12B
3
R96 C34 HIGH
20K402105 2 NE5532 1S63E1
10K SHELF
HCN323160 HIGH Q
S2E
1
13
15
17
MID CLIP SENSE SW440147
C50 R97 C35
1S63E1 100K 1S63E1
R92
CR10
R120 1.54K 1%
1N4148
10K R98
+15V R32 2 100K
EQ OUT
100K 1
3 R100
CR9 R101 3.57K 1%
R119
1N4148 +15V +15V +15V NOTCH 100K OA12A
10K NE5532
4
-15V
R115 R91C
R114 R113
CR8 100K 1% 10M 2.2K 20K402105
7 8
R118 C37
1N4148 R108
10K +15V 1S63E1
+15V 22.1K 1%
11
16
10
9
3
5
13 1 5
4 14 4 6 15 4
CR11 2 8 12 2 3
R121 R109
3
1N4148 5 14 NOTCH CAL
10K 9 R91B 90.9K 1% 2
OA14A IC3B IC3A IC3C
20K402105 R110
6
7
8
LM339D OA14C -/+HIGH MC14053
MC14053 MC14053 50K420281
LM339D
R116
12
1
R117
100K 536K 1%
-15V R106 R67
CR13 R104 R107
R123 20.0K 1% 20.0K 1% 20.0K 1% 20.0K 1%
1N4148
10K MID STAGE
C38 C39
100PK1KD 100PK1KD LOW
R124 CR14 SHELF
1N4148
10K C41
+15V
1S63E1 S3A
5
3
1
CR15 SW440147
R125 1N4148
8
OA13A CR5
10K 6 2 NE5532 LEDR702098
OA14B 7 1 CR6
LM339D OA14D R103 5 3 LEDR702098
CR12 6 20.0K 1% C40
R122 LM339D OA13B
1N4148 1 10 1S63E1
10K NE5532 R111 S2A
4
1
3
5
7 13
R105 10K
1
11
YELLOW 10K SW440147
P2
R126 R127 PA1 -15V HIGH
100K SHELF
100K 1%
C46 RED OVER
.001K1KD1 LED
-15V
-15V
WHITE
P3
dbx PROFESSIONAL PRODUCTS
PA1
1
-15V 8760 South Sandy Parkway
Sandy, Utah 84070
Title
DBX 905 PCA PARAMETRIC EQ 80-6174
Size Document Number Rev
B 056174A0.001 A0
Date: Wednesday, October 20, 1999 Sheet 1 of 2
MID (200 - 5KHZ) LOW (20 - 500HZ)
R44 R8
10.0K 1% 10.0K 1%
R9 C7 C8
R10 R11
R45 R46 C20 R51 C21 10.0K 1% .033JB .033JB
232K 1% 232K 1%
10.0K 1% 232K 1% 3300PH63A 232K 1% 3300PH63A
+15V C18
1S63E1 S3F
+15V +15V SW440147 +15V
OA7A OA3A
NE5532 OA7B LOW NE5532
NE5532
7
8
7
14
16
18
8
1 1 SHELF
2 8 2 6 2 8 2 6
6 1 7 6 1 7
3 5 3 5 3 5 3 5
R48B R14B
C31 R47 R50 50K402104 R52 R14A R17 50K402104 R12