Symetrix 306 Schematic
65 4 3 2 1
REVISION RECORD
REV
C5
REVISIONS DONE OR ECO NUMBER:
DATE:
D
C
B
A
LEFT MUSIC
INPUT
J3-1
+
J3-2
-
GND
J3-3
RIGHT MUSIC
INPUT
J3-4
+
J3-5
-
J3-6
GND
LEFT
UNBAL
INPUT
RIGHT
UNBAL
INPUT
J2
RCA_TWIN_LP
1
GND
1K00
1K00
R16
1K00
R17
1K00
2
3
L
R1
R2
100pF
R
100pF
SIG2
C1
C3
SIG1
CHG5
CHG5
L
R
C2
100pF
C4
100pF
R3
9K09
R4
9K09
R18
9K09
R19
9K09
2
3
R6
10K0
R21
10K0
10K0
+
6
5
47pF
R5
U1A
1
NJM2068M
C6
47pF
C8
47pF
R20
10K0
U1B
+
NJM2068M
C9
47pF
7
C7
4.7/NP
+15V
CW
3
R9
50K
1
-15V -15V
C10
4.7/NP
+15V
CW
3
R24
50K
1
-15V
R7
20K0
R10
2
499K
R22
20K0
R25
2
499K
18
18
R8
61.9
37
EC1
IN
S
V
E
Y
E
C
M
E
2
4K99
R12
R11
51.1
R13
61.9
R23
61.9
37
EC1
IN
S
V
E
Y
E
C
M
E
2
R27
4K99
R26
51.1
-15V
R28
61.9
+15V
VCC
OUT
G
N
D
+15V
VCC
OUT
G
N
D
C11
100pF
R15
13K0
C12
4.7/NP
C14
4.7/NP
DATED:
6254
2K00
6254
R29
2K00
2150A
R14
2150A
U2
U3
DRAWN:
2
-
3
+
CV
[SH1 A3,
SH3 B2]
100pF
6
-
5
+
CV
[SH1 C3,
SH3 B2]
1
U4A
NJM2068M
C13
R30
13K0
7
U4B
NJM2068M
ba 11-11-98
RELEASED:
DATED:
L_MUSIC
[SH2 D6]
R_MUSIC
[SH2 C6]
COMPANY:
TITLE:
DRAWING NO:
+15V
C15
U1C
NJM2068M
8
4
-15V
.1uF
NJM2068M
C16
.1uF
U4C
8
4
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
306 DUCKER - MUSIC IN & VCA
SHEET:
C17
.1uF
C18
.1uF
1
REV:
OF
D
C
B
A
A
5
D
C
B
A
L_MUSIC
[SH1 C2]
R_MUSIC
[SH1 B2]
PAGE
[SH3 D6,
SH4 B1]
NJM2068M
U5C
23456
SEE SHEET 1 FOR REVISIONS
U6A
C19
MAX PAGE
R31
4K99
1
MAX MUSIC
R32
4K99
50K
R33A
CW
6
4
R34
4K99
2
-
3
+
NJM2068M
22pF
R35
20K0
U5A
R36
24K9
C21
1
47/NP
10K0
R136
R38
3K01
1
R37A
50K
CW
6
4
MASTER GAIN
C20
3
R33B
50K
R47
4K99
1N4148
U6C
D1
5
CW
8
4
2
R46
4K99
R49
4K99
R135
10K0
+15V
C32
8
4
.1uF
C33
.1uF
4580_SMD
-15V
R48
4K99
P_CLIP
C34
.1uF
C35
.1uF
4580_SMD
6
5
U7C
22pF
R50
20K0
+
U5B
NJM2068M
8
4
C22
7
47/NP
C36
.1uF
C37
.1uF
10K0
R137
R51
24K9
2
R52
3K01
R37B
50K
CW
5
3
4580_SMD
3
+
2
-
2
-
3
+
U6B
4580_SMD
5
+
6
-
6
-
5
+
R39
24K9
C23
22pF
R40
4K99
C24
22pF
R41
4K99
R53
24K9
C27
22pF
R54
4K99
C28
22pF
R55
4K99
U7B
4580_SMD
1
1
U7A
4580_SMD
7
7
R42
402
R43
402
R56
402
R57
402
R134
10K0
R44
402
R45
402
R60
10K0
R58
402
R59
402
CHG6
CHG6
CHG6
CHG6
C25
100pF
L2
C26
100pF
C29
100pF
L4
C30
100pF
L1
L3
CHG6
D2
1N4148
D3
1N4148
CHG6
COMPANY:
TITLE:
DRAWING NO:
J5-2
LEFT OUT -
J5-1
LEFT OUT +
J5-3
GROUND
P_CLIP
J5-5
RIGHT OUT -
J5-4
RIGHT OUT +
J5-6
GROUND
R63
200K
R61
200K
C31
.1uF
SIG1
SIG2
R62
3K48
J4
RCA_TWIN_LP
2
3
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
306 MIX & OUTPUT
1
+15V
Q1
2N4401
R64
4K99
UNBAL OUT
LEFT
RIGHT
1
GND
SHEET:
Q2
2N4403
R65
2K00
CLIP
D4
LED_T1_R_FORM
REV:
A
OF
2
5
D
C
B
A
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