聲頻率的前置放大器電路 (Amplifier of acoustic frequencies with preamplifier)
Tendency of catering: 15V
Force of expense: 4,2Wrms in the 4W
Minimal signal of entry: 94mVp-p with preamplifier, 0,65Vp-p without the preamplifier.

|
R1 |
2,2KW |
|
R2 |
330KW |
|
R3 |
4,7KW logarithmic potentiometer |
|
R4 |
330W |
|
R5 |
1KW |
|
R6 |
1,5W |
|
C1, C6 |
100nF polyester |
|
C2 |
100mF/25V ilektrolytjko's |
|
C3, C7 |
1mF/25V electrolytic |
|
C4 |
1000uF/25V electrolytic |
|
C5 |
10uF/25V electrolytic |
|
Q1 |
BC547 |
|
U1 |
TDA2002 |
|
LS1 |
Loudspeaker. |
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