Many low pass filter circuits for subwoofer seem to be given And this is also just Another one. The circuit given here is Depending about the opamp TL062 from one ST Micro electronics. TL062 is really a dual high input impedance J-FET opamp And this has quite low power consumption and high slew rate. The opamp has great audio characteristics and it's quite suitable for this circuit.
Out of those two opamps inside TLC062, initial one is wired as the mixer cum pre amplifier stage. The left and right channel seem to be connected in towards the inverting input of IC1a for mixing. The gain of initial stage seem to be either adjusted using POT R3. The output of those initial stage is connected in towards the input of second stage throughout the filter network comprising of components R5,R6,R7,R8,C4 and C5. The second opamp (IC1b) serves as a buffer and the filtered output is at the pin 7 of those TLC062.
Out of those two opamps inside TLC062, initial one is wired as the mixer cum pre amplifier stage. The left and right channel seem to be connected in towards the inverting input of IC1a for mixing. The gain of initial stage seem to be either adjusted using POT R3. The output of those initial stage is connected in towards the input of second stage throughout the filter network comprising of components R5,R6,R7,R8,C4 and C5. The second opamp (IC1b) serves as a buffer and the filtered output is at the pin 7 of those TLC062.
