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2.3 Earphone Circuit
L11
C35
R29
FB
1u
51K
CON1
R30 51K
5
ROUT
4
LOUT
3
DACVREF
C36
2
VCC
1u
1
C64
5P, P=2.0mm
C65
2200P
2200P
C43
C42
VCC
1u
R37 51K
RW_L
AAGND
VR1
VCC
R40 1
C45
1
100u
2
3
RCH
4
LCH
5
C31
1u
AAGND
C10K*2
RW_L
R45
1K
3
R73
MUTE
2
51K
1
Q4
2N3904
AAGND
RW_R
R46
1K
3
MUTE
2
1
Q5
2N3904
C34
+
220u
AAGND
CON2
MUTE
1
RW_R
2
3
RW_L
4
4P, P=2.0mm
C37 10P
R31
51K
U2A
AAGND
MS6308
2
1
DACVREF
3
VCC
R34 1
C40
1u
C39
CB14
+
100u
0.1u
AAGND
C47
1u
10P
R41 51K
RW_R
R38 51K
U3A
AAGND
MS6308
2
C44
1u
1
LCH
DACVREF
3
C61
+
10P
CB13
0.1u
R33
100K
AAGND
C30
R69
AAGND
1u
51K
2
1
3
U8A
MS6308
C63
10P
R72
100K
AAGND
6
C33
7
10u
5
U8B
R75
MS6308
AAGND
VCC
1
CB15
C67
+
0.1u
220u
AAGND
AAGND
C38 10P
U2B
R32 51K
AAGND
MS6308
6
C41 1u
7
DACVREF
5
LCH
RCH
C48
10P
R42
U3B
51K
AAGND
MS6308
C49
6
1u
7
DACVREF
5
RCH
L12
FB
R70
C62
10
220P
J1
2
C32
10u
AAGND
1
3
PHONE JACK
R71
L13
10K
FB
C66
AAGND
220P
L14
FB
R76
AAGND
10
R77
10K
AAGND
20
LCH
RCH
R3
C2
AAGND
C1
R1
1u
51K
1u
2
DACVREF
3
C4
10P
R2
51K
R4
51K
AAGND
6
7
5
U4B
R9
MS6308
C9
VCC
+
1
220u
CB12
C10
+
0.1u
220u
AAGND
CON3
R
1
2
L
3
3P,P=2.0mm
AAGND
ALESIS
Title
EARPHONE Board
Size
Document Number
Date:
星期二, 七月 15, 2003
L1
FB
C3
L
10P
R5
C7
10
220P
51K
C5
10u
AAGND
1
R
U4A
MS6308
R7
L2
51K
FB
C8
AAGND
220P
R6
C6
AAGND
10
10u
R8
51K
AAGND
Rev
00
2006120005
Sheet
1
of
1
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