AMPLIFIERS
SCHEMATIC,
POWER
SUPPLY/AMP
MG300+300W
LOUD Techno
logies Inc.
2038306-XX
2038306-XX-C00.sch
C00
3
1
3
4
5
6
7
8
D
C
B
A
7
8
6
5
3
4
D
S
IZE
D
WG
FILE:
2
NONE
S
CA
LE:
D
WG.
NO.
S
HEET
3
1
OF
REV
.
A
B
C
D
2
16220 WOOD-RED RD NE WOODINVILLE, WA 98072
CHAN
1
SPKR
CHAN
2 SPKR
+
+
AMP 1
IN
AMP 2 IN
ID
LE FREQ
AD
J
ID
LE
FREQ
AD
J
FRONT LED
AMP MUTE
Av=10.8
Av=1.0
300W/4OHMS=34.65V
rms
3.2V
rms=300W out
B
ridge-Mode (-01)
D
ual-Amp-Mode
(-00)
600W/8OHMS=69.3Vrms
R124
22 2W
C74 0.47UF 250V
C79 0.1UF 100V
C85
1000PF
100V
R125 3K 2W
L5
25UH
2
3
1
U10-A
NJM4580M
8
4
U10-C NJM4580M
C98
1000PF
100V
R82
10K0
R84
10K0
R83
10K0
R85
10K0
R80 10K
R81 10K
C112 470PF
C113
220PF
C114
220PF
R174 22 2W
C118 0.47UF 250V
C120 0.1UF 100V
C122 1000PF
100V
R175 3K 2W
C129 1000PF
100V
R132
10K0
R134
10K0
R133
10K0
R135
10K0
R130 10K
R131 10K
C111 470PF
C108
220PF
C109
220PF
Z8
J8-1
J8-3
J8-4
J8-6
R179 0.0
L7
25UH
C15
1000PF
C16
1000PF
C27 0.1uF 200V
R113
10
0.25W
R118
10 0.25W
R114 10K0
R119 10K0
D
40
1N4
148
D
41
1N4148
C29 0.68UF 100V
C38 0.68UF 100V
2
3
1
Q11
IR
FB5615Pb
F
2
3
1
Q12
IR
FB5615Pb
F
R109 51K
C39 47pF 200V
C40 47pF 200V
R121
10 .5W
R122
10 .5W
R111
NS
R110
NS
C41 0.1uF
C42 0.1uF
R116
NS
R115
NS
D
38
ES
1D
D
36
B
AS
21
R101 6R81 .25W
R100 681 .25W
R102 6R81 .25W
R99
4.99K
R98
4.99K
R107
4.99K
R103 36.5K .25W
R106 4.99K
R104 10K0
R105
4.99K
R96 100
D
37
S1B
C96 10uF 25V
C93 10uF 25V
C104 47PF
C97 0.1uF
R108 4.99K
C68 0.1uF
D
50
ES
1D
R120 6R81
.25W
R93 1K
1
VA
A
4
COMP
3
IN-
6
VS
S
8
OCSET
2
GND
5
CSD
7
V
REF
16
CSH
15
VB
14
HO
13
VS
9
D
T
12
VC
C
11
LO
10
COM
U12
IRS209
2S
R97 681 .25W
C69 10uF 25V
C70 10uF 25V
C71 1000PF
C90
4.7uF 25V
R112
0
R117
0
R92 4.99K
R95 51K1 .25W
C94 47pF 200V
R123 3K 2W
C116
1000PF
C117
1000PF
C119 0.1uF 200V
R163
10
0.25W
R168
10 0.25W
R164 10K0
R169 10K0
D
35
1N4148
D
42
1N4148
C121 0.68UF 100V
C123 0.68UF 100V
2
3
1
Q13
IR
FB5615Pb
F
2
3
1
Q14
IR
FB5615Pb
F
R159 51K
C124 47pF 200V
C125 47pF 200V
R171 10 .5W
R172
10 .5W
R161
NS
R160
NS
C127 0.1uF
C128 0.1uF
R166
NS
R165
NS
D
43
ES1D
D
44
B
AS21
R151 6R81 .25W
R150 681 .25W
R152 6R81 .25W
R149
4.99K
R148
4.99K
R157
4.99K
R153 36.5K .25W
R156 4.99K
R154 10K0
R155 4.99K
R146
100
D
45
S1B
C143 10uF 25V
C144 10uF 25V
C145 47PF
C146 0.1uF
R158 4.99K
C147 0.1uF
D
46
ES1D
R170 6R81
.25W
R143 1K
1
VA
A
4
COMP
3
IN-
6
VS
S
8
OCSET
2
GND
5
CSD
7
V
REF
16
CSH
15
VB
14
HO
13
VS
9
D
T
12
VC
C
11
LO
10
COM
U15
IRS2092S
R147 681 .25W
C148 10uF 25V
C149 10uF
25V
C131 1000PF
C151 4.7uF
25V
R162
0
R167
0
R142 4.99K
R145 51K1 .25W
C152 47pF 200V
R173 3K 2W
2
3
1
U13-A
NJM4580M
D
47
1N4148
D
52
1N4148
1
2
3
Q10
MMBT4401
1
2
3
Q9 MMBT4403
8
4
U11-C
NJM4580M
C137 0.1uF
C138 0.1uF
6
5
7
U13-B
NJM4580M
6
5
7
U10-B
NJM4580M
8
4
U13-C
NJM4580M
2
3
1
U14-A
NJM4580M
6
5
7
U14-B
NJM4580M
8
4
U14-C
NJM4580M
2
3
1
U11-A
NJM4580M
6
5
7
U11-B
NJM4580M
R88 4.99K
R89 4.99K
C95 47UF
25V
C115 47UF
25V
R90 51K1 .25W
R91 51K1 .25W
1
2
3
D
53
BAV
99
R87
24.9K
R86
24.9K
C100 47PF
R94 470
R144 470
C135 0.1uF
C136 0.1uF
R137
24.9K
R136
24.9K
R138 4.99K
R139 4.99K
R140 51K1 .25W
R141 51K1 .25W
C126 47PF
1
2
3
D
54
B
AV99
R178
3.32K
4
3
1
2
L8
1mH
J8-2
J8-5
R57 33.2K
R59
33.2K
C130
0.1uF
C132
0.1uF
R58 33.2K
D
39
5.6V
D
56
5.6V
D
60
5.6V
D
61
5.6V
J9-1
J9-2
1
2
3
4
Q18 FZT649
1
2
4
3
Q19
FZT749
1
2
3
4
Q20 FZT649
1
2
4
3
Q21
FZT749
1
2
3
4
Q24 FZT649
1
2
4
3
Q25
FZT749
1
2
3
4
Q27 FZT649
1
2
4
3
Q28
FZT749
Z1
J101
-00
ONLY
J100
-01
ONLY
4
3
1
2
L12 1mH
C43 1000PF
100V
C84 1000PF
100V
4
3
1
2
L15 1mH
C157 1000PF
100V
C158 1000PF
100V
SLT2 SHIELD
SLOT
SLT1
SHIELD
SLOT
FTP40
FTP41
FTP42
FTP43
FTP44
FTP45
FTP46
FTP47
4
3
1
2
L6
1mH
R9
51K
R42
100K
C103 0.1uF
R186 33.2K
Z6
C66 10uF 50V
D
27
1N4148
FTP
30
FTP31
FTP
32
FTP33
FTP
34
FTP35
FTP
36
FTP37
FTP
48
FTP
49
FTP
38
FTP
39
+15V
-15V
+15V
-15V
+15V
-15V
+15V
+15V
[1,3
]
-60V
[1,3]
VCC-AMP
[1,2,3]
+60V
[1,3]
-60V
[1,3]
VCC-AMP
[1,2,3]
+60V
[1,2,3]
+60V
[1,3
]
-60V
[1,2,3]
+60V
[1,3]
-60V
[1,3
]
PGND
[2]
MUTE/
[1,3]
PGND
[1,3]
PGND
[2,3
]
CHGND3
[2,3]
CHGND3
[2]
A
MP_1-
[2]
A
MP_1+
[2]
AMP_2-
[2]
AMP_2+
[2]
D
C_D
ET_1
[2]
DC_DET_2
Page 43 of 50
THUMP18S SER
VICE MANUAL
2038306-01 SCHEMATIC POWER SUPPLY/AMP
AMPLIFIERS