1 2 3 4 5 6

E? VCC/9V
ANTENNA/B
D1 4001
C24 VCC3V-A
R14 VCC3V-A IC9 VCC-9V
R7100K R9 0R C79 D2 4001 AC
106P 100R AMS1117/3.3 C79 7809 K1
50P C4 2 3 220U/35V 3 1 1000U/35V

GND

GND
C21 S2 R10 1K Vout Vin Vout Vin D3 4001
C80 SW-SPST C1
L6 C81 C28
VCC3V-A 1 8
104P 2 7 106P 106P 104P 106P D4 4001
FL1 800B R4

2
3 6 R8 1K5
A 47R 4 5 A
C2 1K R76 J1
R5 R7
L5 100P C9 C15 104P C13 VCC3V-B IC3 33K DC
100K 106P 106P 0R AMS1117/3.3 Q12
L4 L12 R6
2 3 Q11

GND
50P C3 L7 Vout Vin
C17 C18 15N 22N R1 2F
47R L L3 1N5 C27 C26 R25 1G R75 100K
C11 3P R78 C76
102P 100P L1 C10 3P C2 C12 VCC3V-A 106P 106P 2K2 10K

1
68N C5 106P R69 10K C70 106P
C16 33P 33
106P C4 106P C30 LED3
L2 4N7 100P C6 Y1 C78 C77 C69 106P
104P

19
20
21
22
23
24
Q? R32 C47
106P C48 C58 R-POWER 106P 106P
520 L10 L13 C7 20K
L11 C22 24MHz 104P 106P

VREF
AVSS

AVSS
INDN
INDP
AVSS
104P L8 200P
10N 4P R28 R33
68N 18 1 C14 C13
AVDD XI L C51 50P
L10 22N 17 2 C37 510R C44 10K Q5 D7 4148
RFVDD XO 104P 106P R37 10K
C19 7P 16 IC1 3 3 106P
RFVSS KT0613 AVDD 106P 470P C52 50P
15 4 1
RF_INN AOUT_P RC4558 1G
14 5 2
RF_INP AOUT_N C40 C43 IC6A R40 20K R47 10K
L9 68N 13 6 R45 C41 C54
RFVSS CH

DVDD

MUTE
R39
DVSS
6

SDA
SCL
CN
106P R29 470P R34 12K 10K R41 10K
VCC/9V 10K 7 6 C42 C39 MIC JK2
E? VR1 106P RC4558 R42
VCC3V-A VCC3V-A 510R 10K R35 20K C53 5 7
B ANTENNA/A IC4B RC4558 B
5
IC5B 1K
12
11
10
9
8
7
C88 LED2 L15 L 106P 106P 106
R12 R25 10K R30
R80 C49 200P C33
106P 0R R31 R44 270K R19 1K
100R R13 1K 1K C50 47K
C23 C28 C29 C46 104P C34
50P C108 R24
C87 G-RFB 104P 106P 106P 106P 106P 106P
L29 10K
8
7
6
5

R26 Q6 C38 50P

C32 连接点 D6 4148 R38 R20
104P D5 IN4148
FL2 800B R87
VSS SDA
A2 SCL
A1 WP
A0 VCC

106P R11 10K 10K 10K R21 10K C45 Q2

47R IC2 Q4 1G R17 10K
10K 106P
R88
C86 VCC3V-B 24C02 2 2
R22
L28 100P 1G 1 1 1G C31
RC4558 RC4558 R18 10K
100K 3 3
L27 1K
1
2
3
4

L24 C87 C94 R56 1K R55 10K IC4A IC5A

50P C107
C102 C89 15N 22N 106P 106P R15 106P
3P C109 C35 47K JK3 CH-B
102P 100P L25 C105 3P R79 L17
68N 47R L16 1N5 106P
C101 L LED1
AF/B C57 50P
100P C85 C84 3
L30 4N7 C82 C90 VCC3V-B R?
104P R51 10K 2
Q13 106P 33P 33P C106 10K
C96 100P C68 1
Y2
520 2 106 BALANCED-B
19
20
21
22
23
24

C83 104P R58 C63 R16 Q3

106P C60 1 C59
C L23 L22 R? C
L21 C97 24MHz L19 200P 20K 104P 3 RC4558 R59 1K 106P
47K 1G
VREF
AVSS

INDP
AVSS
AVSS
INDN

10K IC7A
C86 104P 10K
10N 4P 68N 18 1 L R71 R59
AVDD XI C92 C91
L20 22N 17 2 C74
RFVDD XO 106P 510R C66 IC6B
C93 7P 16 3 104P 5 IN4148 D8
RFVSS AVDD 106P 470P R67 C61
15 IC10 4 7 R62 Q8
RF_INN KT0612AOUT_P RC4558 R64 10K
14 5 6 1K 106P
RF_INP AOUT_N C67 C64 10K R68 10K
L18 68N 13 6 C72
RFVSS CH 1G
DVDD

MUTE

VR2
DVSS

470P R50 C75 104P

SDA
SCL

106P R72
CN

10K
12K 106P R46 10K
510R R61 R60 20K
VCC3V-B R73 R54
10K
12
11
10
9
8
7

C56 5 C65 C55 J4 CH-A

VCC3V-B C103 C64 200P 10K 7 R63 47K
R92
C100 C104 106P 6 RC4558 1K
1K 106 106P
LED4 IC7B 3
R911K 104P 106P 106P VCC3V-B D9 4148 R57 270K
0R R37 C62 104P 2
L26 L22 R77 20K 1
G-RFA R86 0R
C89 R70 R53 C73 50P Q10 BALANCED-A
Q7 R74
8
7
6
5

C99 连接点 104P

S3 R85 1K Q? 10K 10K
47K
A1 WP

VSS SDA
A2 SCL
A0 VCC

106P IC11 R90 1 8 1G 1G

D 10K 2 7 D
24C02 3 6 1G
R84 1K5
4 5 Title
R83 1K R66 1K R65 10K
1
2
3
4

R81 100K
R82 Size Number Revision
0R
B
AF/A LED5
Date: 2015-5-26 Sheet of
File: D:\Client98\..\BM-908B.Sch Drawn By:
1 2 3 4 5 6
 1 2 3 4 5 6

C37 Q3
106P SI2305
C39
C32 L9
106P 106P 1uH
C26 R25
L7 106P D1
270K
1uH R19 5819
D C24 47R D
106P L10 L8 C30
68N 68N C29 106PP
100P
C21
106P L6
C23
1N5 106P

C16
33P C20 C25
104P 104P

24
23
22
21
20
19
Y1 L11 E?
R30 R25 0R C12 24MHz 47N ANTENNA

AVDD
AVSS
AVSS
INDP

AVSS
INDN
100K 33P
R27 1K K1 R24 1K 1 18 C28 C36 C38 C41
R23 XI VREF L15 L13 L12
1 8 2 17
R28 1K 2 7
MICROPHONE2
C11 C18 3
XO
IC3
AVDD
16 10N 10N
1K5 MK? VREF AVSS 100P
3 6 102P C15 104P 4 KT0603Q 15 100P 3P 100P 100P
R29 1K 4 5 R22 L2 106P 5
MICIN OUT_N
14
VCM OUT_P

SDA/LED

CHIP_EN
C42 106P 6 13
R26 1K 1K 1uH
C14 C17 BAT AVSS C35 C34 L17

DVDD

MUTE
104P SW-DIP4 R12 C27 C33 0.68UH L16
R13 L14

SCL
47K 100P 104P 5P 5P 3P 0.68UH

CH
R21 1K
0R C10 10N
L1 R18 1K 100P

10
11
12
7
8
9
C C31 C
1uH
C22 3P
106P
R15 1K R16
C9 104P R17 22K
104P C7 C13 R14 1K
L5 10K
104P
R10 R11 1uH

8
7
6
5
C6 10K 10K R6 C19

VSS SDA
VCC

SCL
WP
104P 1K 106P

IC2

A0
A1
A2
24C02
LED1

1
2
3
4
LED-R

SW1
B B

L3

A1
1

Q2 106P
SW

L4 SI2305 C2
5 6
VOUT VIN
100uH
R9
1M IC1
C8 C4 C5 C3 AP2000
106P 100U/16V 106P 106P 3 4 R5 R4 C40 BT?
FB SHDN
GND

1K 47K 106P BATTERY

R8
620K R1
2

Q1 1K
1G
R2 R3
R7 10K 150K
100K
C1
A 106P A

Title

Size Number Revision

B
Date: 9-Apr-2015 Sheet of
File: D:\Client98\..\MIC18B-KT-U.Sch Drawn By:
1 2 3 4 5 6