2

4

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20W AUDIO AMPLIFIER

R1

2K2

D1RED LED

R820K

R71K

R61E 1/2W

R51M

R3100K

C41uF

C70.1uF

+

C6

22uF

/50V

GND

+V

12

CN2

AU

DIO

IN

1

24

53

-

+

U1LM1875

+

C52200uF/35V

+

C310uF/50V

R2R

R4R

C20.1uF

+ C12200/25V

12

CN1

DC

IN

12

CN3

SP

EA

KE

R

This Kit is designed to operate withminimum of external components. this amplifieroffers high quality performance at vary lowdistortion. Project is based on nationals LM1875IC.The IC is thermal and short circuit protected.

Specifications:Supply 48V DC

Current consumption 1Amp.

Output 20W @ 4 Ohms Load

Gain 26dB. 26dB

Frequency Response 20Hz to 20Khz

PCB size 48 X 60 mm

2

4

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SR. QNY. REF. DESCRIPTION

1 1 CN1 2 PIN PBT

2 1 CN2 2 PCB PIN

3 1 CN3 2 PIN PBT

4 1 C1 2200/25V

5 2 C2,C7 0.1uF

6 1 C3 10uF/50V

7 1 C4 1uF

8 1 C5 2200uF/35V

9 1 C6 22uF/50V

10 1 D1 RED LED

11 1 R1 2K2

12 2 R2,R4 22K

13 1 R3 22K

14 1 R5 1M

15 1 R6 1E 1/2W

16 1 R7 1K

17 1 R8 20K

18 1 U1 LM1875

19 1 HEATSINK HS02060

20 2 STUD ST05008

21 4 SCREW SC02905

22 1 SCREW SC02909

23 1 NUT NT02900