声频率的前置放大器电路 (Amplifier of acou

声频率的前置放大器电路 (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.