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02-25-2010

20W audio amplifier

National Semiconductor » LM1875

Rajkumar Sharma

This schematic is designed to operate with minimum of external components. This amplifier offers high quality performance at very low distortion. Project is based on National LM1875 IC. The IC is thermal and short circuit protected.

Specifications:

Supply

48V DC

Current consumption

1Amp.

Output

20W @ 4 Ohms Load

Gain

26dB

Frequency Response

20Hz to 20Khz

Schematic:

Part List:

QNY.

REF.

DESCRIPTION

1

CN1

2 PIN PBT

1

CN2

2 PCB PIN

1

CN3

2 PIN PBT

1

C1

2200/50V

2

C2, C7

0.1uF

1

C3

10uF/50V

1

C4

1uF

1

C5

2200uF/35V

1

C6

22uF/50V

1

D1

RED LED

1

R1

2K2

2

R2, R4

22K

1

R3

22K

1

R5

1M

1

R6

1E 1/2W

1

R7

1K

1

R8

20K

1

U1

LM1875

1

HEATSINK

HS02060

2

STUD

ST05008

4

SCREW

SC02905

1

SCREW

SC02909

1

NUT

NT02900

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