Microlab M-620 Schematics
321
4
C7
D
C
B
A
JK1
AC IN
AC ADAPTER IN
VR1A
B10K
C1
0.22UF
0.22UF
C1'
VR1B
B10K
R8
33K
R8'
+VB
R9
100K
SW1
C25
104
8
R11
2
3
U4A
4
4558
-VB
47K
1
C26
104
D1
1N5402
D2
1N5402
R12
10K
+VCC
-VCC
C25
3300UF
25V
C26
3300UF
25V
33K
R10
8.2K
C121UF
C11
104
T1
1 2 34
R13
10K
R19
470/0.5W
R20
470/0.5W
C2
682
R1
8.2K
C2'
682
R1'
8.2K
C13
224
6
57
ZD1
9.1V
ZD2
9.1V
C14
104
+VB
-VB
R2
3.3K
R2'
3.3K
U4B
C23
47UF
C24
47UF
C3'
0.22UF
C15
0.22UF
VR2
B10K
R21
2.7K
C3
0.22UF
R142.7K
-VCC
472
C4
C4'
472
LED1
R3
6.8K
R3'
6.8K
C16
102
104
C5
3.3UF
R4
510
C5'
3.3UF
R4'
510
C17
22UF
R15
510
C8
100UF/25V
1
U2
2
1
U3
2
C9
104
+VCC
1
U5
2
C20
104
-VCC
Title
Date: 27-Mar-2003 Sheet of
File: F:\huang bf\HUANG\M-620.ddbDrawn By:
+VCC
5
TDA2030A
4
3
5
3
C10
100UF/25V
TDA2030A
5
3
TDA2030A
4
R5'
33K
-VCC
4
R16
39K
C10'*
100UF/25V
C19
104
R5
33K
R6'
3.3
C19
224
R17
3.3
C6'
224
M-620 SUBWOOFER
Number RevisionSize
A4
R7 0.5
C6
224
R6
3.3
R7'
0.5
C8'*
100UF/25V
0.5
R18
0.5
SP1
6 ohm
SP2
6 ohm
SP3
4 ohm
SYSTEM
D
C
B
A
L.M.An
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