
J2
MIC
INPUT
LINE
INPUTS
GND
+
C102
.01
FB1
BEAD
FB2
BEAD
J1
TB1
C105
.001
C106
.001
2
1
3
R11
4K99
R12
4K99
C1
10/80
.047 MY
47/63
.047 MY
100K
C103
47/63
C104
R1
PHANTOM
POWER
R10
1K0
C2
R13
10K0
R14
10K0
C3
2
R2
100K
1N5232
1N5232
1N5232
1N5232
R3
2K10
OUT
IN
1
SW1A
3
D1
D2
D3
D4
100K TRIM
2K00
R4
470 pF
C13
R271
+48
330 pF
OFFSET
TRIM
C4
R272
100K0
100K0
R6
13K0
C14
470 pF
R273
12
9
+IN
-IN
C
6
47 pF
R5
43K2
C16
150 pF
C5
C
V
+
7
5
SSM2015
N
U
L
L
2
3
R8
15K0
REVISIONLTR
REDRAWN WITH CHANGE F
INCORP ECO
EC0 528-001
G
CHANGED C8, C9, C33
EC0 528-4
R188 R191 NOW 3K65
+15
R23
10K
-15+15
4
V
-
U2
N
U
L
L
8
10 pF
10 pF
47 pF
R7
45K3
+15
8
4
-15
1
3
C15
C
1
C8
C9
1
U1A
RC4560
OUT
-15
3
R16
R9
13K0
10K0
CW
R18
2K5C
R17
56
R19
10K0
MIC
GAIN
C11
4.7 NP
11
R
10
R
B
1
4
R15
27K
R21
100
R20
13K0
D5
1N4148
R27
13K0
6
5
C10
.1
C96
150 pF
7
U1B
RC4560
2N5210
R22
1M0
R28
100
Q1
C17
100/35
R24
8K2
R29
100K
Q2
2N4403
R25
1K5
1 4
J4
TB1
4
D6
LED
RED
3 2
CLIP
MIC/LINE
OUTPUT
DATE
12-12-89
3-3-93
7-7-93G1
Title
SYMETRIX INC.
4211-24 TH AVE W.
SEATTLE WA. 98199
SCHEMATIC 528
REVDocument NumberSize
G191750B
6of 1Sheet July 7, 1993Date:

R69
13K0
DE-ESS
INPUT
100K TRIM
TB1
5
4.7 NP
.047 MY
R52
C19
C26
+15
-15
R30
51K
82K
R53
R54
100
R50
6K98
R31
51K
C18
47 pF
+15
8
2
3
-15
4
U3A
RC4560
R32
5K1
1
6
1 3
A1R1A
50KC DUAL
DE-ESS
5
P1
2
4 6
A1R1B
50KC DUAL
FREQUENCY
R64
13K0
C20
.0056 MY
7
U3B
R66
13K0
R67
13K0
+15
C21
6
5
RC4560
1
DE-ESS
CW
5
R33
5K1
4
.0027 MY
6
5
R65
13K0
C100
150 pF
U8B
RC4560
C101
150 pF
+15
E
C
2
2
R45
61.9 1%
7
V
C
C
OUT
2
8
G
N
D
6
3
3
E
IN
-15
C
1
U5
A 2150
V
S
E
Y
E
M
5
4
R38
51
R37
5K1
C22
4.7 NP
7
13K0
+15
-15
R34
1
R36
300K
R35
100K TRIM
+15
-15
82 pF
8
4
C24
R47
13K0
U4A
RC4560
DE-ESS
OUTPUT
R48
100
1
C25
100/35
R49
100K
TB1
6
RANGE
R51
200K
LM3046
LM3046
8 7
6
5
U7D
U7C
11 10
9
6
C27
22 Pf
U6B
LF353N
DE-ESS PCB
ASSEM#
305006DS
A1
D7
1N4148
U7B
LM3046
5 3
R55
R56
10K0
+15
-15
R57
10K0
8
4
2K2
1
U6A
LF353N
7
2
3
4
U7A
LM3046
1 3
2
A1R2
50KB
R58
100
R59
1M0
CW
3
-15
3.3/35T
2
1K00
C28
R62
R60
160K
R61
1M0
2
3
-15
D8
1N4148
+15
-15
R63
30K1
8
4
D9
1N4148
1
U8A
RC4560
R40
61.9 1%
SW2A
1
3
DE-ESS
OUT
DE-ESS
6
4
IN
SW2B
DE-ESS
BYPASS
2K00
2
5
R39
DE-ESS
SYMETRIX INC.
Title
4211-24 TH AVE W.
SEATTLE WA. 98199
SCHEMATIC 528
REVDocument NumberSize
G1191750B
6of 2Sheet July 7, 1993Date:

+15
C31
COMP/LIM
SIDE-CHAIN
+15
R99
100K TRIM
-15
INPUT
R98
82K
OUTPUT
INPUT
R94
6K98
200K 1%
R97
100
R96
TB1
7
9
10
R42
100K
U11C
LM3046
8 7
6
22 Pf
6
5
R73
100K
C34
U11D
LM3046
U12B
LF353
R101
10K0
9
7
R41
100
R43
100K
11 10
2
3
1N4148
+15
-15
8
4
D51
R100
2K2
R102
10K0
4.7 NP
C33
4.7NP
1
U12A
LF353
C30
U11B
LM3046
5 3
U11A
LM3046
1 3
R77
61.9 1%
C29
4.7 NP
100K TRIM
5
6
4
2
LF353
1N4148
R105
30K1
R106
1K00
-15
R103
1M0
-15
R75
U14B
D12
R107
+15
-15
7
750K
R74
13K0
R108
150K
R104
4K7
C35
10/35
1
R76
300K
D15
1N4148
2
1/35T
R122
1K00
IN
-15
1N4148
R112
1K0
1N4148
CW
C36
3
E
C
1
U10
A 2150
V
S
E
Y
E
M
5
4
R78
51
R79
5K1
D13
D16
+15
3
A2R1
50KB
EXPAND
THRESHOLD
1
-15
5
6
1N4148
R121
30K1
E
C
2
1N4148
U13B
LF353
-15
2
R80
61.9 1%
D14
3M3
R110
7
D11
R123
1M0
7
V
C
C
OUT
82 pF
R89
2
3
R71
1N4148
D19
1N4148
5
+15
-15
13K0
8
4
C37
4.7/35
C38
10/35
-15
D17
1N4148
1
U9A
RC4560
1K0R128
D20
+15
R114
300K
R115
3M3
R116
3K83
4
A2R2
50KB
COMP
R90
100
+15
3
2
-15
D44
1N4148
D18
1N4148
R126
100K
COMP/LIM PCB
305006CLCW
R129
100
ASSEM#
100/35
8
4
-15
R127
10K
A2
C42
U14A
LF353
1
R118
10K0
R117
47K
8
G
N
D
6
1K00
R111
10K
R113
100
R124
137K
THRESHOLD
6
-15
1N4148
1
R137
100K
1/35T
10/35
-15
C39
C40
D49
R109
10K
TB2
COMP/LIM OUTPUT
R119
10K0
R130
100K
R131
1M0
D45
1N4148
R120
10K0
C41
.001
+15
8
2
3
-15
1
U15A
4
LF353
+15
8
3
2
4
-15
R132
9K09
Title
CLIP
1N4148
U13A
LF353
1
R133
10K0
7
U15B
LF353
D21
R91
49K9
C32
.001
6
5
1N4148
R135
50KB
R92
470K
D22
COMPRESS
RATIO
SYMETRIX INC.
4211-24 TH AVE W.
SEATTLE WA. 98199
SCHEMATIC 528
-15
CW
+15
R93
100K0
OUT
6
4
SW3B
IN
BYPASS
(COMP/EXPAND)
R95
50KB/1C
OUTPUT
LEVEL
5
C/L
REVDocument NumberSize
G1191750B
6of 3Sheet July 7, 1993Date:

BANDWIDTH
2
DUAL POT
PCB
ASSEM#
305006EQL
CW
R140
3K9
1
A3R2
50KA
3
R141
680
R151
20K
R142
U16A
LF353N
CW
2
CW
5
R149
2K4
51K
R146
3K0
FREQUENCY
R150
3K0
R161
3K9
CW
1
A4R2
50KA
3
R162
680
R172
20K
BANDWIDTH
C46
.1 MY
6
5
C47
.1 MY
6
5
LF353N
7
U16B
LF353N
7
U17B
2
DUAL POT
PCB
ASSEM#
305006EQM
5
2
3
R164
51K
+15
8
1
4
-15
R165A
50KC
R166
1K8
R171
51K
R165B
50KC
A4
R143
51K
+15
8
2
3
-15
R147
5
51K
4
R144A
50KC
R145
R144B
50KC
1
3
1
2K4
6
4
A3
U19A
LF353N
3
CW
2
1
CW
6
5
4
R168
1K8
R163
51K
R167
5K6
FREQUENCY
R170
5K6
6
5
.0047 MY
6
5
C49
.0047 MY
LF353N
C50
LF353N
U19B
7
U20B
R181
3K9
CW
1
A5R2
50KA
3
R182
680
R193
20K
BANDWIDTH
2
7
DUAL POT
PCB
ASSEM#
305006EQH
R185
51K
+15
8
2
3
-15
R192
5
1
4
R187A
50KC
R186
2K4
51K
R187B
50KC
A5
U22A
LF353N
3
CW
2
1
6
CW
5
4
R189
2K4
R184
51K
R188
3K65
FREQUENCY
R191
3K65
6
5
.0022 MY
6
5
C52
.0022 MY
7
U22B
LF353N
C53
7
U23B
LF353N
C47
4
EQ
INPUT
CW
CUTBOOST
50KB1CA3R1
R154
5K1
R155
56K
20K
R156
6
2
3
NOTCH
TRIM
LOW FREQUENCY
TB2
C44
2
100/35
+15
-15
R153
5K1
8
4
17A
LF353
R157
10K
R158
5K1
C45
.1 MY
1
+15
8
3
2
-15
4
R159
5K1
1
U18A
LF353N
R160
10K
D46
1N4148
BOOST
4
CW
R176
56K
CUT
50KB1CA4R1
R175
5K1
20K
R177
6
2
3
NOTCH
TRIM
+15
-15
8
4
5K1R174
20A
LF353
R178
10K
1
MID FREQUENCY
R179
5K1
C48
.1 MY
5
6
7
U18B
LF353N
R180
5K1
R183
10K
D47
1N4148
BOOST
4
CW
50KB1CA5R1
R196
5K1
R197
56K
HIGH FREQUENCY
CUT
20K
R198
6
2
3
NOTCH
TRIM
+15
-15
8
4
5K1R195
U23A
LF353
R199
10K
R200
5K1
1
C51
.1 MY
R268
5K1
-15
4
+15
8
R201
5K1
U24A
1
LF353
D48
1N4148
R203
10K
3
2
150 pF
R269
5K1
6
5
U24B
LF353
R270
7
100
EQ
OUTPUT
SW4B
4
6
3
1
5
R242
100K
SW4A
2
C54
100/35
CLIP-
4
TB2
R202
100K
R138
100K
SYMETRIX, INC.
4211 24TH AVE WEST
SEATTLE, WA 98121, USA
Title
SCHEMATIC 528
REVDocument NumberSize
G1191750B
6of 4Sheet July 7, 1993Date:

+23
STACKING
GND
INPUT
OUTPUTDRIVER
INPUTS
TB2
D24
1N4148
LM339
LM339
LM339
LM339
5
4
1N4148
2
U27A
1
U27B
14
U27C
13
U27D
+15
1
U26B
LM339
14
U26C
LM339
13
U26D
LM339
D25
R230
10K
3
1
2
2
U26A
LM339
7
6
5
R260
13K0
R261
13K0
R262
13K0
C59
R125
10K
1N4148
R212
100
R208
10K0
D26
U32B
RC4560
7
C107
82 pF
+15
8
2
3
-15
4
1
U32A
RC4560
C71
4.7 NP
R204
10K0
R205
10K0
6
5
R216
130K
82 pF
7
U25B
RC4560
CLIPCLIP
6
5
D23
1N4148
1N4148
100/35
2
3
R217
200K
D27
C57
R210
10K0
+15
-15
8
4
C56
82 pF
1
U25A
RC4560
R218
1K0
.47/35T
R213
100
C97
R214
100K
C58
100/35
+15
+23
6
4
2
3
1
5
R219
100K
J3
TB2
10
8
9
R215
100K
P7
SIX-POS .156 IN.
RIGHT-ANG MALE HEADER
TO CLIP
DISPLAY
NOT
CONNECTED
TO V.U.
DISPLAY
UN-BALANCED
OUTPUT
+
BALANCED
GND
OUTPUT
-
DISPLAY
SWITCH
C/L
DE-ESS
R228
16K
6
4
5
SW5B
R220
1K3
R221
1K3
R222
1K3
R223
1K3
R224
1K8
R225
2K7
R226
2K7
15
R227
4K3
5
4
7
6
9
8
11
10
7
6
9
8
11
10
R231
1M0
+15
3
1
2
R229
100
Q6
2N4403
15 18
J5
17 16
13 20
J5
19 14
11 22
J5
21 12
9 24
J5
23 10
7 26
J5
25 8
5 28
J5
27 6
3 30
J5
29 4
J5
1 32
J5
31 2
16-POS FEMALE
PC HEADER
SYMETRIX INC.
4211-24 TH AVE W.
SEATTLE WA. 98199
D35
LED
D33
LED
D34
LED
D32
LED
D31
LED
D30
LED
D29
LED
D28
LED
-3
RED
-6
RED
-9
RED
-12
RED
-16
RED
-22
RED
-30
RED
-40
RED
Title
SCHEMATIC 528
REVDocument NumberSize
G1191750B
6of 5Sheet July 7, 1993Date:

VUJ7
4
6
2
N.C.
+15
VUC1
.1
VUQ3
2N5210
VUR3
1M
VUR15
8K2
VUR2
10K
VUQ1
2N4403
VUR1
1K5
1 4
VUJ4
3 2
CLIP
VUD1
RED
SIX-POS
FEMALE
.156 IN.
SOCKET
VUD4
LED
VUD5
LED
VUD6
LED
VUD7
LED
VUD8
LED
VUD9
LED
VUD10
LED
VUD11
LED
305006VU
DISPLAY
BOARD
-20
GRN
-15
GRN
-10
GRN
-6
GRN
-3
GRN
-0
YEL
+3
YEL
+6
YEL
SYMETRIX INC
4211-24 TH AVE W.
SEATTLE WA.
Title
528 VU DISPLAY
REVDocument NumberSize
G1305006VUB
1of 1Sheet July 7, 1993Date:
1
VUR4
100
VUQ2
2N4403
15 18
VUJ5
17 16
13 20
VUJ5
19 14
11 22
VUJ5
21 12
9 24
VUJ5
23 10
7 26
VUJ5
25 8
5 28
VUJ5
27 6
3 30
VUJ5
29 4
1 32
VUJ5
31 2
16-POS FEM HEADER
3
1
2
3
1
2
1N4148
VUU1A
LM339
VUU1B
LM339
VUU1C
LM339
LM339
VUU2A
LM339
VUU2B
LM339
VUU2C
LM339
VUU2D
LM339
VUD2
1N4148
VUD3
2
VUR5
10K
1
14
13
VUU1D
2
1
14
13
3
VUR6
750
5
VUR7
560
VUR8
1K0
VUR9
1K3
VUR10
1K5
VUR11
2K2
VUR12
+15
82K
VUR14
3K0
VUR13
4K3
+15
5
4
7
6
9
8
11
10
+15
5
4
7
6
9
8
11
10

POWER
D50
RED
LED
1 4
J6
R267
2K2
3 2
A.C.INPUT
PWR CORD
P6
A.C. SELECT
110V <--> 220V
.5 AMP @ 117 VAC
.25 AMP @ 230 VAC
0
FUSE
F1
1
1 1
2
2
4
3
SW7
P8J8
56
2
T1
120019
1
6
2
12
5
7
D58
1N4003
8
D60
9
10
11
1
2
1N4003
R246
10
D54
1N4003
D55
1N4003
C99
.01
D59
1N4003
D61
1N4003
D52
1N4003
D53
1N4003
C66
100/100
C60
1000/35
C61
1000/35
R249
470K
U30
78M15
1
VI
G
N
D
2
2
VI
U31
79M15
1
G
N
D
R248
10K0
VO
VO
C67
47/63V
3
3
TIP29
Q8
+15
C63
4.7/35
C65
4.7/35
-15
C62
.01
D57
1N5260
C64
.01
+48
C72
.01
C73
.01
C74
.01
C75
.01
C76
.01
C77
.01
C78
.01
C79
.01
C80
.01
C81
.01
C82
.01
C83
.01
C84
.01
C85
.01
C86
.01
C87
.01
C88
.01
C89
.01
C90
.01
C91
.01
C92
.01
C93
.01
C94
.01
C95
.01
Title
SYMETRIX INC.
4211-24 TH AVE W.
SEATTLE WA. 98199
SCHEMATIC 528
REVDocument NumberSize
G1191750B
6of 6Sheet July 7, 1993Date: