Microlab M-890 Schematics

4321

+VCC

TDA2030A

4

TDA2030A

4

-VCC

4

C24
100UF/25V

C21
104

R19
39K

R7
33K

R7'
33K

C6
224

R8

3.3

C6'
224

R8'

3.3

C22
100UF/25V

C19
224

R20

3.3

M-890 SUBWOOFER SYSTEM

Number RevisionSize

R8

3.3

R8

3.3

SP3
6 ohm

SP1
4 ohm

SP2
4 ohm

D

C

B

A

WANGZHAO

R17
22K

R5
24K

R5'
24K

C7
104

R6
510

R6'
510

JK1

D

C

C29

B

A

104

SW1

AC IN

R

C1

L

0.47UF

C1'

0.47UF

R9
33K

R9'
33K

+VB

R11

8.2K

C9

1UF

T1

1 2 3 4

2

3

R12
100K

-VB

D1 1N4004

D3 1N4004

D4 1N4004

VR1B
B10K

C11

104

8

R13

U4A

4

4558

D2 1N4004

VR1A
B10K

39K

1

C12
104

C2
682

R2

3.3K

R1

8.2K

C2'
682

R2'

3.3K

R1'

8.2K

C13
224

R14
10K

+VCC

C25
3300UF
25V

C26
3300UF
25V

-VCC -VB

R15
10K

R21

470/0.5W

R22
470/0.5W

6

5 7

U4B

C14
104

+VB

ZD1

9.1V

ZD2

9.1V

VR3A
B50K

VR3B
B50K

C27
47UF

C28
47UF

C15

0.47UF

VR2
B10K

C03
223

C03'
223

R23

2.7K

C4

0.22UF

C4'

0.22UF

C16

0.47UF

LED1

-VCC

C5

2.2UF

C5'

2.2UF

C18
22UF

R18
560

C8
100UF/25V

C23
104

5

1

U2

2

3

5

1

U3

2

3

C8'
C7'
104

100UF/25V

+VCC

TDA2030A
5

1

U5

2

3

-VCC

Title

A4

Date: 25-Nov-2003 Sheet of
File: F:\my file\My Design\M-890.ddb Drawn By:

PDF created with FinePrint pdfFactory trial version http://www.fineprint.com