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 |