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1
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2
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11
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12
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K
K
J
J
I
I
H
H
G
G
F
F
E
E
D
D
C
C
B
B
A
A
PreAmp
Section:
Product(s):
Preamp.SchDoc
M1802
2
11
Sheet
Of
PCB#:
Rev#:
Modified:
V01
File:
2020-03-17
EF10P-EF12P-EF15P
EML Rev#:
01
Tmp Rev:
V031
NCJ6FAV-0
XLR-PHONE
MAIN INPUT
4090
J1:1
NCJ6FAV-0
XLR-PHONE
MAIN INPUT
4090
J1:2
DO-214ACBI
SMAJ150CA
D28
Male XLR
4140
.
10K0
0805
R54
10K00
0805
R51
10K00
0805
R60
475R0
0805
R50
475R0
0805
R59
1M
0805
R52
1M
0805
R55
0603
C64
0603
+15V
-15V
CDSF4148
CDSF4148
1K800
0805
R47
1K800
0805
R57
1K02
0805
R48
1K02
0805
R58
0805
C58
0805
C68
0805
C65
5X5.5mm
C66
8K25
0805
R53
1K62
0805
R56
CDSF4148
D25
NCJ6FAV-0
XLR-PHONE
LINE IN
4090
J3:1
NCJ6FAV-0
XLR-PHONE
LINE IN
4090
J3:2
DO-214ACBI
SMAJ150CA
D35
IGND
10K00
0805
R67
10K00
0805
R74
0805
C82
0805
C84
MC33078
7817
U6:2
U6:3
U7:3
1K02
0805
R65
1K02
0805
R73
0805
C81
10K00
0805
R68
10K00
0805
R75
10K00
0805
R79
10K00
0805
R78
10K00
0805
R88
10K00
0805
R87
10K0
0805
R86
0603
C86
MC33078
7817
U8:1
U8:3
MC33078
U11:2
U9:3
MC33078
7817
U9:1
U11:3
MC33078
7817
U10:1
U10:2
U10:3
2K74
0805
R81
2K74
0805
R89
D1005
CDSF4148
D36
475R0
0805
R92
475R0
0805
R99
0603
C88
0603
C92
475R0
0805
R93
475R0
0805
R100
MIC IN
XLR FEML
4010
J5
2K74
0805
R101
2K74
0805
R94
0805
C87
0805
C95
1210
C80
30K0
0805
R69
B LIN
P2:1
1210
C83
681R
0805
R71
7K50
0805
R72
D1005
CDSF4148
D32
CLIP
D1005
CDSF4148
D31
CLIP
D1005
CDSF4148
D37
CLIP
30K0
0805
R97
1K02
0805
R96
B LIN
P3:1
1210
C94
1K02
0805
R102
0603
C85
20K5
0805
R103
0805
C93
D1005
CDSF4148
D38
CLIP
64K9
0805
R98
805
C91
10K0
0805
R95
10K0
0805
R91
10K0
0805
R77
10K0
0805
R80
10K0
0805
R90
330R0
0805
R82
330R0
0805
R85
1K02
0805
R83
1K02
0805
R84
MixerEnable
UP
DOWN
3522
S4:2
MixerEnable
UP
DOWN
3522
S4:1
MIX+
MIX-
MIX-
MIX+
K
1
:1
K1:2
D1005
CDSF4148
D34
SOD-323
18V0
D33
17K8
0805
R70
MMBT5401
7837
Q8
1K02
0805
R76
+15V
-15V
MC33078
7817
U11:1
MC33078
U9:2
MC33078
7817
U7:2
MC33078
7817
U6:1
+15V
-15V
+15V
-15V
GND
0805
C61
0805
C60
0805
C70
0805
C71
0805
C77
0805
C76
0805
C59
0805
C69
1210
C89
0805
C90
M
A
IN
I
N
P
U
T
T
H
R
U
L
IN
E
I
N
M
IC
I
N
MIC
LINE
MIXER ENABLE
MMBTA14LTIG
7701
Q7
0805
C75
CLIP INDICATOR
4K75
0805
R62
0805
CLIP
B LIN
10K
.
4459
P3:2
B LIN
10K
.
4459
P2:2
4K75
0805
R138
MicGND2
BusGND
LineGND1
LineGND2
LEDGND_
1206
C
2
1
D1005
CDSF4148
D4
MMBTA14LTIG
7701
Q3
0805
C25
LIMIT INDICATOR
30K0
0805
R8
10K0
0805
R7
15K0
0805
R49
MC33078
7817
U7:1
DGND
1M
0805
R143
0805
C22
LimitSig
BusGND
.
U
P
D
O
W
N
3
5
2
2
S
2
:1
S
u
b
.
S
2
:2
.
U
P
M
O
M
E
N
T
A
R
Y
D
O
W
N
3
4
3
9
COM
S
1
:1
.
NO
COM
NC
S
1
:2
MOMENTARY
2PDT MINI
UP
DOWN
3439
COM
S3:1
MOMENTARY
2PDT MINI
UP
DOWN
3439
NO
COM
NC
S3:2
Sub_Switch
BT_Switch
Mode_Switch
Mode
0606LED
RGB
6001
L
D
2
+15V
Mode_R
Mode_G
Mode_B
NetC22_1
N
et
C
8
3
_
1
Switch_Gnd
MC33078
U8:2
47R
0805
R148
47R
0805
R149
47R
0805
R150
47R
0805
R151
47R
0805
R152
47R
0805
R153
+15V_1
+15V_2
+15V_3
-15V_1
-15V_2
-15V_3
MicGND2
47R
0805
R157
+15V_5
IGND
DNS
0805
R160
AIN_
AIN_
AIN_LO_SENS-
AIN_HI_SENS-
U17:1
1K50
0805
R176
C5
1K02
0805
R175
100R
0805
R177
U17:4
1K50
0805
R179
C63
100R
0805
R180
1K50
0805
R178
U17:3
1K50
0805
R182
C78
3K92
0805
R181
100R
0805
R183
U17:2
1K50
0805
R187
C100
100R
0805
R188
1K50
0805
R185
1K50
0805
R192
1K50
0805
R193
ClipIn
LimitIn
30K0
0805
R197
10R
1206
R195
+3V3_UC
10R
1206
R198
30K0
0805
R196
CLIP
SO14
MC33079D
7668
U17:5
+15V
-15V
47R
0805
R199
47R
0805
R200
0805
C74
0805
BusGND
AD_Ref
SG1
SG2
SG3
SG4
SG5
SG6
SG7
SG8
5X5.5mm
C142
0805
C143
0805
C144
1M
0805
R142
1M
0805
R202
CH_Gnd
Connection to CHGND2 in
Use a wire to connect these two
points when working on the bench.
Power Supply through the chassis.
Connected to Main
Input at top left.
619R0
1206
R210
619R0
1206
R212
619R0
1206
R213
619R0
1206
R211
4.3X3.9
C149
Ph+24v
100R
0805
R209
6x6mm
C147
6x6mm
C148
N35
N34
N36
N33
N30
N32
N31
PreAmp
562R0
0805
R214
100R
0805
R217
100R
0805
R215
100R
0805
R216
3.5mm JCK
4218
1
J4
BusGND
LineGND2
L+
L-
S+
S-
N26
N27
N28
N29
N37
N38
N39
MainIn
LimitSig
Mode_Sw
Sub_Sw
BT_Sw