654321
CHANNEL 1 INPUT
BALANCED
J1
XLR-FEM
2
3
D
1
4
BAL/UNBAL
J2 1/4" TRS
C
SIDECHAIN
SEND/RETURN
J3 1/4" TRS
100K0
B
S/C_IN_CH1
R46
TO LOGAMP INPUT
C73
470pF
2K00
C69
470pF
C70
470pF
2K00
C72
470pF
R1
R2
C2
470pF
C1
470pF
R23
6K98
C71
470pF
R4
13K0
R5
13K0
100PF
C4
C12
4.7NP
C3
100PF
R3
15K0
2
U1A
+
1
4560
C11
4.7NP
R24
100.0
3
R6
15K0
CHANNEL 1
MASTER
OUTPUT LEVEL
(FRONT PANEL)
C10
4.7NP
+15VA
R50
100K
-15VA
CH1_CTRL
R99
50KB
30K1
1
2
CHANNEL 1
3
DISTORTION
TRIM
1
2
CW
3
-15VA
R26
R96
301K
R29
499K0
R94
100K0
357K0
R27
61.9
R95
U5
2150A
EC1
18
IN
S
Y
M
R28
5K11
R30
51.1
-15VA
+15VA
37
VCC
2150A
R31
61.9
6
5
V
E
E
+
E
C
2
C35
.001uF
R93
49K9
U12B
4560
OUT
G
N
D
6254
7
C13
4.7NP
CHANNEL 1
C14
82pF
R25
15K0
6
U1B
-
5
+
4560
R32
1K00
IN/OUT
(SHOWN IN)
SW1A
3
1
7
13K0
2
CH2INOUT.2
S/C_JACK_CH2
R36
R45
6K98
O/PLEDS_CH1
C15
82pF
R35
13K0
6
U2B
-
5
7
+
4560
LINK
(SHOWN IN STEREO LINK)
7
9
6
4
8
SW2C
5
SW2B
R33
158.0
R34
158.0
C26
47NP
470pF
470pF
C27
47NP
CV_IN_CH2
C74
C75
J13A
J13B
J13C
J13D
J13E
J13F
J13G
J13H
J13I
J13J
J13K
J13L
J13M
J13N
J13O
J13P
R61
100K0
R60
100K0
SW2D
11
UNBALANCED
J51/4" TRS
BALANCED
J4XLR-MALE
2
3
EXPLEDS_CH1
COMPLEDS_CH1
LIMLEDS_CH1
EXPLEDS_CH2
COMPLEDS_CH2
LIMLEDS_CH2
O/PLEDS_CH2
10
12
4
3
1
CHANNEL 1
OUTPUT
1
2
SW2A
+15VA
-15VA
D
C
R128
2K10
B
A
REVISION RECORD
B
A
S
B
A
S
RB
DATE:
4/6/94
3/20/95
6/13/95
8/2/95
8/11/95
9/19/95
2/22/96
3/27/96
05/09/96
LTR
E3
A0
A1
B0
B1
C0
C1
C2
C3
C4 ADDED RESISTOR TO EACH LOGAMP OUTPUT. 9/26/97
REVISIONS DONE OR ECO NUMBER:
RESISTORS AS PER ECO 425-12
R79, R172 to 250K. R80, R173 to 137K0.
R39, R146 to 4K87. Added HS1, HS2.
C7, 17, 28, 44, 52, 57, 60, 65
to 4.7uF/35VNP, per ECO.
Changed to A Series Neutrik, added
Molex to power supply.
Added LIM SYM test points.
CHANGED GROUNDING - PCB ONLY
Changed pcb decals of 1N4003 diodes from
DO-7 to DO-41.
Chg’d 5% resistors to 1%: 150 to 158, 510K to
499K, 560K to 536K (no changes to pcb art).
Chg’d R161 from 18 ohms/5% to 10 ohms/1%.
DRAWN:
RELEASED:
DATED:
DATED:
COMPANY:
SYMETRIX, INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
TITLE:
425 DUAL COMP/LIMITER/EXPANDER
DRAWING NO:
022425
SHEET:
A
REV:
C.4
OF
17
123456
D
C
B
A
CHAN 1
LOG CONV
TRIM
R12
13K0
C7
4.7NP
S/C_IN_CH1
+15VA
1
R49
100K
CW
3
-15VA
R48
10K0
-15VA
3
2
200K0
2
+
-
R11
6K98
R63
R64
200K0
MC3346P
13
U3A
4560
D2
1N4148
R10
200K0
-15VA
U10D
12
2
3
1
R13
1M5
10K0
+
14
6
5
R65
100.0
R47
U9B
MC3346P
8
C19
22pF
+
U6A
1
4560
R14
536K
U9C
MC3346P
10
7
6
U6B
7
4560
13
-15VA
1
U9A
2
MC3346P
U10A
2
MC3346P
15
2
(BYPASS)
9
D8
1N4148
R62
2K10
U9D
MC3346P
3
3
+15VA
1
R22
50KB
CW
3
R21
73K2
-15VA
11
R66
1M
14
12
5
4
4
PEAK_DET_CH1
EXPANDER
THRESHOLD
(FRONT PANEL)
+15VA
NOTE: R188 ADDED TO CORRECT "OVERACTIVE" HARRIS 3046
PART MAY BE OMITTED OR CHANGED IN VALUE IF NECESSARY.
R188
13K0
3
2
R57
1K00
+
-
U8A
4560
R56
30K1
R55
158K0
1
C9
.22uF
-15VA
+
-15VA
R67
2K67
C21
10uF
+
C22
3.3
R54
3K48
C18
33uF
+
R17
2K67
CH1 EXPANDER SIDE CHAIN
R39
4K87
R38
2M0
U3B
6
+
7
4560
R37
10M
5
D7
1N4148
TP1
+15VA
CW
2
-15VA
2K10
3
1
R18
20K0
R53
10K0
R9
C6
.22uF
-15VA
COMPRESSOR
R59
THRESHOLD
50KB
(FRONT PANEL)
R58
2K00
R20
10K0
500KA
DRAWN:
RELEASED:
R15
1M
2
3
R44
C5
22pF
2
3
D3
1N4148
U4A
+
4560
2
31
CW
D1
1N4148
R7
1M
U2A
-
1
+
4560
R8
6K04
C8
22pF
1
D5
1N4148
RELEASE
(FRONT PANEL)
CH1 COMPRESSOR
SIDECHAIN
D11
1N4148
C28
4.7NP
+
-15VA
R19
100.0
Q1
2N4401
D4
1N4148
COMPANY:
TITLE:
DRAWING NO:
RELEASE
(FRONT PANEL)
R16
1K00
D6
1N4148
DATED:
DATED:
R76
191
R78
500KA
2
CW
31
+15VA
CHANNEL 1
IN/OUT
(SHOWN IN)
SW1C
7
9
COMPLEDS_CH1
R85
50KB
(FRONT PANEL)
CH1_CTRL
R52
10K0
U7A
1
4560
SW1B
6
4
CHANNEL 1
C23
10uF
R75
2K10
R77
10M
5
6
U4B
4560
+
-
R40
150K0
R41
10K0
5
+
6
-
R73
10K0
D10
1N4148
7
R74
10K0
U8B
4560
7
R51
10K0
R72
30K1
8
CW
3
2
1
C20
22pF
2
-
3
+
IN/OUT
(SHOWN IN)
+
3.3
-15VA
C16
R42
2K10
C17
4.7NP
-15VA
R43
10M
SYMETRIX INC.
14926 35th Ave. W.
Lynnwood, WA 98037-2303
425 DUAL COMP/LIMITER/EXPANDER
022425
SHEET:
RATIO
5
1N4148
EXPLEDS_CH1
D16
1N4148
D15
REV:
C.4
OF
27
D
C
B
A
654321
D
C
LIMITER
THRESHOLD
(FRONT PANEL)
R98
50KB
+15VA
3
1
-15VA
+15VA
BYPASS
CW
2
R97
R81
301K
CH1 LIMITER SIDE CHAIN
C29
.047
PEAK_DET_CH1
R84
1M
U12A
3
2
R82
1K00
+
-
1
4560
R83
24K3
D13
1N4148
-15VA
TP3
LIM SYM
D12
1N4148
R71
2M0
C25
.039
1N4148
D9
D
LIMLEDS_CH1
U7B
4560
5
+
6
-
SW1D
11
7
10
12
R69
191
SYSTEM IN/OUT
R68
15K8
C24
10pF
(SHOWN IN)
D14
1N4148
R92
49K9
C34
.01
CH1_CTRL
C
B
A
LIMITER
THRESHOLD
TRIM
CW
3
1
2
R79
100K
536K
R80
301K
DRAWN:
RELEASED:
DATED:
DATED:
R70
10K0
COMPANY:
TITLE:
DRAWING NO:
SYMETRIX INC.
14926 35th Ave. W.
Lynnwood, WA 98037-2303
425 DUAL COMP/LIMITER/EXPANDER
022425
SHEET:
B
A
REV:
C.4
OF
37
123456
D
C
CHANNEL 2 INPUTS
BALANCED
J6 XLR-FEM
C76
2
3
470pF
C78
470pF
1
4
470pF
BALANCED/
UNBALANCED
J7 1/4" TRS
2K00
2K00
C77
R86
R87
C31
470pF
C30
470pF
R89
13K0
R90
13K0
R91
15K0
2
3
C32
100PF
R88
15K0
U11A
+
4560
C33
100PF
R104
61.9
U13
2150A
C36
4.7NP
+15VA
1
3
R111
100K
1
DISTORTION TRIM
-15VA
R103
30K1
R106
499K0
2
CHANNEL 2
EC1
18
IN
S
Y
M
R105
5K11
R107
51.1
+15VA
37
VCC
2150A
-15VA
OUT
G
E
V
N
C
E
D
2
E
6254
C39
O/PLEDS_CH2
82pF
R102
15K0
U11B
6
-
5
+
4560
R143
13K0
7
C48
47NP
C49
47NP
C79
470pF
C80
470pF
6
5
C50
82pF
R142
13K0
+
4560
U17B
R140
158.0
7
R141
158.0
CHANNEL 2 OUTPUTS
J10
1/4" TRS
J9
R116
100K0
C68
XLR-MALE
2
3
R115
100K0
UNBALANCED
OUTPUT
1
BALANCED
OUTPUT
4
D
C
B
A
SIDECHAIN
SEND/RETURN
J8 1/4" TRS
C81
470pF
R100
6K98
C82
470pF
C38
4.7NP
R110
100K0
R101
100.0
S/C_IN_CH2
S/C_JACK_CH2
C37
4.7NP
CV_IN_CH2
R109
1K00
R108
61.9
DRAWN:
RELEASED:
CH2_CTRL
CHANNEL 2 (SLAVE)
OUTPUT LEVEL
(FRONT PANEL)
DATED:
DATED:
1
R187
50KB
3
COMPANY:
TITLE:
425 DUAL COMP/LIMITER/EXPANDER
DRAWING NO:
R182
100K0
2
-15VA
.001uF
R181
CHANNEL 2
49K9
R183
357K0
R184
301K
U25B
6
-
5
+
7
4560
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
022425
IN/OUT
(SHOWN IN)
SW3D
10
12
SHEET:
11
B
CH2INOUT.2
A
REV:
C.4
OF
47
654321
D
C
B
A
CHANNEL 2
LOG CONVERTER
R129
13K0
C44
4.7NP
TRIM
R113
10K0
S/C_IN_CH2
+15VA
1
R114
100K
3
-15VA
2
3
12
13
-15VA
U18A
4560
3
+
2
D19
1N4148
R126
200K0
R127
6K98
2
CW
R112
10K0
+
U14A
4560
-15VA
200K0
14
U16D
MC3346P
1
536K
R130
1M5
10
8
R118
200K0
R119
1
R131
U15B
MC3346P
6
5
R120
100.0
2
2
+15VA
2
CW
-15VA
3
U15A
MC3346P
U16A
MC3346P
3
1
R139
50KB
3
(BYPASS)
R138
73K2
15
15
7
6
C40
22pF
U14B
+
7
4560
4
4
PEAK_DET_CH2
R134
2K67
EXPANDER
THRESHOLD
(FRONT PANEL)
+15VA
9
D17
1N4148
R146
4K87
R145
2M0
MC3346P
R117
2K10
11
U15C
-15VA
U15D
MC3346P
6
-
5
+
4560
R144
10M
13
+
U18B
R121
1M
R155
3K48
-15VA
12
C53
33uF
-15VA
7
+
14
C45
.22uF
D24
1N4148
R122
2K67
C41
10uF
3
2
R158
1K00
R135
20K0
+
-
+
4560
C42
3.3
U23A
R157
30K1
R156
158K0
R154
10K0
SEE NOTE PAGE 2
TP2
1
R159
D18
R189
13K0
CW
2
2K00
R125
2K10
+15VA
3
-15VA
-15VA
COMPRESSOR
R160
50KB
1
THRESHOLD
(FRONT PANEL)
2
3
R137
10K0
500KA
1
2
C43
.22uF
D20
1N4148
C47
22pF
R132
+
R151
R123
2
3
1M
U19A
4560
CW
3
1N4148
C46
1M
22pF
U17A
+
4560
1
D22
1N4148
RELEASE
(FRONT PANEL)
1
R124
6K04
R133
1K00
D23
1N4148
RELEASE
(FRONT PANEL)
CH2 EXPANDER SIDE CHAIN
DRAWN:
RELEASED:
DATED:
DATED:
500KA
1
2
R169
191
R171
+15VA
C65
4.7NP
R136
100.0
2N4401
1N4148
CH2 COMPRESSOR
SIDECHAIN
D27
1N4148
CW
3
R168
2K10
+
-15VA
Q2
D21
COMPANY:
C55
10uF
5
6
+
-15VA
R170
10M
U19B
+
-
C51
3.3
4560
R148
10K0
R147
150K0
R149
2K10
SYMETRIX INC.
Lynnwood, WA 98037-2303
TITLE:
425 DUAL COMP/LIMITER/EXPANDER
DRAWING NO:
022425
CHANNEL 2
U23B
5
7
6
R166
10K0
D26
1N4148
-15VA
C52
4.7NP
+
4560
R167
10K0
R152
10K0
R150
10M
7
3
R178
50KB
1
2
3
14926 35th Ave. W.
COMPLEDS_CH2
IN/OUT
(SHOWN IN)
R165
30K1
CW
2
RATIO
(FRONT PANEL)
U22A
4560
7
9
CH2_CTRL
1
SW3C
C54
22pF
R153
10K0
+
CHANNEL 2
IN/OUT
(SHOWN IN)
SHEET:
SW3A
2
8
EXPLEDS_CH2
1N4148
D31
1N4148
5
3
1
D32
REV:
OF
D
C
B
A
C.4
7
654321
D
C
LIMITER
THRESHOLD
(FRONT PANEL)
R186
50KB
+15VA
3
1
CW
D
CH2 LIMITER SIDE CHAIN
LIMLEDS_CH2
U22B
4560
5
R177
1M
C66
U25A
1
-15VA
TP4
LIM SYM
PEAK_DET_CH2
.047
4560
3
R174
2
301K
+
2
-
R164
2M0
C64
.039
D25
1N4148
+
6
-
7
R162
15K8
C63
10pF
SW3B
5
SYSTEM
IN/OUT
(SHOWN IN)
6
4
R179
191
D30
1N4148
R180
49K9
C67
.01
CH2_CTRL
C
B
A
-15VA
LIMITER
THRESHOLD
TRIM
+15VA
CW
3
1
2
R173
536K
R172
100K
R185
301K
R175
1K00
R176
24K3
D29
1N4148
D28
1N4148
DRAWN:
RELEASED:
DATED:
DATED:
R163
10K0
COMPANY:
TITLE:
425 DUAL COMP/LIMITER/EXPANDER
DRAWING NO:
SYMETRIX INC.
14926 35th Ave. W.
Lynnwood, WA 98037-2303
022425
SHEET:
B
A
REV:
C.4
OF
67
654321
D
IEC POWER
C
JACK
IEC A.C. JACK
J12
2
3
1
(INTERNAL PC MOUNTED)
1/4 AMP FUSE FOR 117V
1/8 AMP FUSE FOR 230V
J14
MAINS FUSE
OPTIONAL
MAINS POWER
SW5A
2
SW5B
5
12
CUT IF SW5
IS INSTALLED
HS1
3
1
FOR EXTERNAL POWER
(OMIT T1, SW4-5
J14, & J12)
120028
T1
12
J11
123456
7
11
8
10
C58
.01uF
R161
10.0 OHM
D36
D35
1N4003
D33
D34
+
+
C59
1000/35
C62
1000/35
4
6
SW4
5
46
230 VAC115 VAC
13
2
1
6
2
5
A.C.RANGE SELECT
SWITCH (INTERNAL)
HS_6021
U20
78M15
1
VIN
2
VIN
GND
2
1
GND
U21
79M15
HS2
HS_6021
VOUT
VOUT
3
C57
4.7NP
C60
4.7NP
3
C56
.01uF
C61
.01uF
JP2
0 OHM
JP1
0 OHM
+15VA
D
C
-15VA
B
A
+15VA
BP1
.1uF/50V
BP3
.1uF/50V
BP5
.1uF/50V
BP7
.1uF/50V
BP9
.1uF/50V
BP11
.1uF/50V
BP13
.1uF/50V
BP15
.1uF/50V
BP17
.1uF/50V
BP19
.1uF/50V
B
8
U19C
4560
4
8
4
U14C
4560
8
U1C
4560
4
BP2
.1uF/50V
8
U3C
4560
4
BP4
.1uF/50V
8
U6C
4560
4
BP6
.1uF/50V
8
U4C
4560
4
BP8
.1uF/50V
8
4
U8C
4560
BP10
.1uF/50V
8
U18C
4560
4
BP12
.1uF/50V
8
4
U2C
4560
8
U7C
4560
4
BP14
.1uF/50V
8
U11C
4560
4
BP16
.1uF/50V
COMPANY:
8
U22C
4560
4
BP18
.1uF/50V
8
U25C
4560
4
BP20
.1uF/50V
8
4
U12C
4560
8
4
U23C
4560
8
4
-15VA
U17C
4560
SYMETRIX INC.
A
DRAWN:
RELEASED:
DATED:
DATED:
TITLE:
425 DUAL COMP/LIMITER/EXPANDER
DRAWING NO:
14926 35th Ave. W.
Lynnwood, WA 98037-2303
022425
SHEET:
REV:
C.4
77
OF
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