Symetrix 421M, 1C00 Schematic
C
B
A
J3-1
+
J3-2
-
J3-3
J3-4
PHANTOM
(SHOWN OUT)
2
SW7A
R248
1K00
+
C74
47/63
MIC
65 4 3 2 1
REVISION RECORD
DATE:
11/08/95
07/05/96
RLYRLY+
J3-5
+
J3-6
-
J3-7
GND
REV:
C
OF
DD
C
B
A
7
LINE
INPUT
3
1N4742
1
R246
4K99
R247
4K99
C69
470pF, 2.5%
XLR-FEM
1
J1
C85
.001
C3
220pF
J2
1/4" TRS JACK
+55V
SH7
Z3
12V
L1
BEAD
2
3
C68
470pF, 2.5%
R244
200
R245
249
R228
100
C72
470pF, 2.5%
L2
BEAD
C71
470pF, 2.5%
C4
220pF
D70
C70
470pF
R227
100
Q16
TIP30A
R243
10K0
Q12
2N4403
R229
1K00
D68
-15V2
R2
1K00
R1
1K00
SH6
R231
2K00
C79
220pF
R234
20
470pF
D69
C1
C2
470pF
R232
2K00
330pF
R230
1K00
C53
220pF
NOTE:
1. ALL DIODES 1N4148 UNLESS NOTED
2. ALL RESISTORS IN OHMS
3. ALL CAPS IN uF UNLESS NOTED
R4
9K09
R3
9K09
4K99
Q13
2N4403
C78
R5
MIC GAIN
CW
(BACK PANEL)
R233
2K5-C
R235
10K0
.056
C8
.056
2
3
C6
100p
2
-
3
+
R236
100K
U13B
7
RC4560
C7
R8
30K1
4K99
C5
100p
U1A
+
RC4560
C73
330pF
R237
10K0
U13A
RC4560
+
R7
15K0
R6
R241
59K0
1
6
5
4.7NP
5
6
INPUT_LVL
(0 to -10dB)
LINE GAIN
(BACK PANEL)
1
R240
78K7
U1B
6
-
5
+
RC4560
R242
78K7
R238
100K
C84
U5B
+
RC4560
7
SH6
CW
R177A
10KA
R178
4K22
7
SW8A
1
3
125 Hz
(SHOWN OUT)
LOGIN
SH4,6
2
SW2A
6 KHz
(SHOWN OUT)
1
3
2
4.7NP
50K
R15
R9
6K49
R10
6K49
R11
100K
+15V
-15V
R14
13K0
C13
1
2
THD
3
CW
.0047
DRAWN:
RELEASED:
6
5
2
3
R21
10K0
C14
100p
+
R22
10K0
R23
10K0
C15
+
NE5532
R13
6K49
C10
.0022
R20
61.9
U4
EC1
18
IN
S
Y
M
R16
1M
R17
61.9
R18
61.9
C11
U2A
3
+
2
-
RC4560
C9
.0022
R
+15V
37
VCC
2150A
R19
-15V
OUT
V
E
G
E
C
N
E
2
D
4K99
R35
1K21
SH6
VCA_CV
133 mV/dB
1
6254
R12
6K49
DATED:
B 3/21/95
DATED:
U3B
7
NE5532
22pF
U3A
1
C12
.0047
COMPANY:
TITLE:
DRAWING NO:
5
6
R24
100
C17
47NP
R26
R25
100
U2B
+
-
RC4560
100K
C16
47NP
7
LTR
3.0 REMOVE DE-THUMP, "FINALIZE" COMP VALUES 09/21/95
A.0
B.0 CHANGE C9-12 TO METALIZED POLY 04/05/96
B01
C Add R187,R210,C80,C81 (sheet 6) per ECN138 04/14/99
RL1
1
2
8
7
160035
R27
100K
R31
10K0
C19
100p
10K0
REVISIONS DONE OR ECO NUMBER:
"FINALIZE" COMPONENT VALUES AGAIN,
FIX EXPANDER THRESHOLD, RELEASE TO PRODUCTION.
Chg fuse text to reflect changed values.
4
5
2
3
1/4" TRS JACK
R28
10K0
C18
100p
1
XLR-MALE
J4
4
SH5
R30
R29
10K0
3
6
2
3
U5A
+
RC4560
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - AGC LEVELER
52 421M 1 1
SHEET:
SH7
SH7
1
J5
OUT_LVL
C
ARM
LOG_OUT
65 4 3 2 1
+15V
SH4
R38
4K99
SH4
R70
10K0
"ON" IN AUTO
R65
1M
D53
Q3
2N5458
Q1
2N5458
U6A
2
-
3
+
R69
4K99
R37
200K
U6B
6
-
5
+
LM324
LM324
D1
7
R56
768K
1
R36
1M
(CAUSES GAIN TO DECREASE IF STEADY STATE
SIGNAL PRESENT, SUCH AS FEEDBACK)
R66
4K99
D8
R39
2K67
"OFF" IN AUTO
D10
R68
383K0
.47uF
+15V
R67
383K0
20K0
C21
R40
10
9
D2
R41
1M
U7C
+
LM324
8
R44
20K0
(FRONT PANEL)
R42
1K00
D3
D4
R43
500KA
2
1
EXPANDER
RELEASE
D5
3
CW
R49
100
Q2
2N4401
R51
9K09
U7D
12
+
-
14
LM324
R48
10K0
13
R45
2K00
+
C23
C24
2.2
4.7NP
R47
150K0
R46
1M
R50
13K0
R64
13K0
R278
4K99
U7A
2
-
3
+
LM324
D17
D93
1
R52
10K0
5
6
+
-
EXP_CV
SH3
U7B
7
LM324
GREEN
R55
4K99
D6
IN15
SH7
EXPAND
DD
C
B
A
R113
1K21
AUTO
EXPANDER
THRESHOLD
(FRONT PANEL)
BYPASS
+15V
1
CW
-15V
R58
50KB
2
3
R57
10K0
R60
383K0
R59
13K0
-15V
R71
10K0
R112
10K0
R72
3M3
-15V
R74
10K0
R61
4K99
LOW WHEN IN AUTO
U6C
9
10
+
LM324
8
R73
10M
R63
2M2
13
12
R62
10M
U6D
+
LM324
R54
20K0
R103
10K0
14
D7
HIGH WHEN EXP IN BYPASS
R75
10K0
OPEN WHEN IN AUTO
Q17
2N4401
D9
R249
10K0
-15V
DRAWN:
RELEASED:
R
B 3/21/95
DATED:
DATED:
COMPANY:
TITLE:
DRAWING NO:
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - EXPANDER
52 421M 1
SHEET:
2
REV:
OF
B
A
C
7
65 4 3 2 1
C
B
LOG_OUT
SH4
R76
50KB
OUTPUT LIMITER
THRESHOLD
50K
R77
THRESHOLD
TRIM
RATIO_BUF1
SH4
+15V
CW
-15V
+15V
-15V
CW
3
1
+15V
D71
R80
R91
R92
158K0
2
3
R90
30K1
U9A
+
LM324
1
3
1
2
R78
2
249K0
R79
200K
40K2
49K9
5
6
R82
2K37
U25B
+
RC4560
R81
30K1
D11
R93
49K9
R83
7
100
R97
59K0
R94
49K9
U9B
6
-
5
+
LM324
D12
R95
10K0
R96
1M
R259
10K0
7
D92
+
Q19
2N5458
RATIO_BUF2
D15
R260
100K
10
C20
2.2
9
C83
4.7NP
-15V
+15V
LM324
+
U9C
R85
R84
200K
10M
10
SH4
8
9
U9-8 should go high for
about .5 seconds when the
ratio pot is turned CCW.
CAUSES C20 TO DISCHARGE RAPIDLY.
12
13
U8C
+
LM324
U8D
+
-
14
LM324
C22
22pF
D13
R86
15K0
D63
8
POSITION OF RATIO POT
EXP_CV
R87
10K0
4
5
R88
10K0
AGC OR LIMITER
CONTROL VOLTAGE
SH2
U20B
+
15K8
R101
35K7
R102
30K1
LM339
R99
2
R89
4K99
13
12
R98
20K0
U9D
+
LM324
IN15
SH7
+15V WHEN UNIT IS ENABLED
D14
RED
LIMIT
CV
SH6
14
DD
C
B
A
TARGET
OUTPUT
LEVEL
(FRONT PANEL)
50KB
R32
+15V
CW
-15V
R100
49K9
1
R33
2
200K
3
R34
158K0
C76
.47uF
3
2
U25A
+
RC4560
1
DRAWN:
RELEASED:
R
B 3/21/95
DATED:
DATED:
COMPANY:
TITLE:
DRAWING NO:
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - LIMITER
52 421M 1
SHEET:
3
REV:
OF
A
C
7
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