2.1 Stereo + Subwoofer Preamplifier Circuit

Pre-amp 2.1 Stereo + Subwoofer this system is part of tone control for speaker 2.1 channel system. This 2.1 audio preamplifier circuit there are some settings, for subwoofer settings, there are VOLUME SUBWOOFER, FREQUENCY, and PHASE. As for stereo channel or satellite speakers, there are settings VOLUME, MIDDLE, TREBLE, AND MIDBASS. This circuit is very compatible with 2.1 Channel home audio amplifier and can be applied to car audio 2.1 channel amplifier.

Below the circuit schematic of 2.1 Preamp Tone Control:

Component List

R1, R5= 5K6

R2, R6, R9, R33, R45, R46= 22K

R3, R4, R7, R8, R15, R21, R30, R31, R37, R42= 10K

R10, R25, R34= 68K

R11, R14, R16, R17, R20, R22, R47, R48= 1K

R12, R13, R18, R19= 100K

R23= 27K

R24= 470K

R26, R27= 3K9

R28, R29= 15K

R32= 100R

R35, R36, R40, R41= 8K2

R38, R39, R43, R44= 4K7

C1, C3, C6, C8=1u/25V

C2, C7, C13, C16= 22p

C4, C5, C9, C10= 56N/ 47N

C11, C14= 470N

C12, C15= 1N

C17, C18, C19, C20, C22, C24=100N

C21= 220N

C23= 47N

C25= 68N

C26, C29= 4N7

C27, C30= 10N

C28, C31= 2N2

C32, C33= 1000uF 50V

C34, C35= 22uF/50V

C36, C37, C40, C41, C42, C43= 220uF/ 25V

C38, C39, C44, C45= 100N

D1, D2, D3, D4=1N4007

D5, D6= Zener 12V - 15V

U1, U2, U3= NE5532

U4= TL084

Q1= TIP31 

Q2= TIP32

J1= Stereo Input

J2= Stereo + Subwoofer Ouptut 1.Sub Out 2. L Out 3.R Out 4. Gnd

J3= V Input AC 20V CT

PCB Layout Design

Download
Gerber Files= 2.1 Preamplifier PCB Gerber 
Password=elcircuit.com