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Subwoofer Filter Circuit Board

Cheap car subwoofer filter circuit description:

     This subwoofer filter set Suitable for use with a great car audio system. Since this circuit is designed to operate with a 12 volt DC power. But if you put it to use with a home stereo, It do not have any rules. This subwoofer circuit set is designed to has a cut off frequencies of 200 Hz. If you are not satisfied, you can change the C6, C7, C8, new, follow the table below.
      The left cannel input signal is entered pass through capacitors C1, C3 are the output Signal to the original circuit. (Or rear left in the car). And the right cannel input signal is entered to C2, C4 to the original circuit. (Or rear right in the car). Two resistors R1 and R2 will be mixer audio signal the left channel and the right channel both together. Then next wire connects to C5. This capacitor is also know as the coupling capacitor to inverting input of M5218A (IC1a). The VR1 serves as a set of IC1a gain with much or less as you want.
     The output signal is entered pass through the low pass filter circuit that consists of R5, R6, R7, R8, C6, C7, C8 and IC1b Which will allow low frequencies under 100 Hz passed away only. And the output from pin 1 of IC1b is entered to pass through R9, C9 on to the power amplifier circuit that be designed for driver only the subwoofer loud speaker We use the LM7812 IC2 as 12V dc fixed regulator for this circuit so can use the voltage supply range 12Vdc to 24Vdc as we want. The diode D1 is protector connection voltage supply that wrote terminal that it can damage the IC1.

Cheap car subwoofer filter circuit diagram:

Cheap car subwoofer filter pcb layout:


Cheap car subwoofer filter circuit partlist:

IC1_______________________________M5218A
IC2_______________________________LM7812 IC-regulator 12V
R1, R2, R3_______________47K_______Resistor 1/4W 1%
R4, R5, R6, R7, R10_______10K_______Resistor 1/4W 1%
R8______________________20K_______Resistor 1/4W 1%
R9______________________100 ohm__ Resistor 1/4W 1%
C1, C2, C3, C4, C5________ 4.7uF 63V _see text
C6______________________0.33uF 63V see text
C7______________________0.27uF 50V see text
C8______________________0.027uF 50V see text
C9, C10__________________10uF 16V see text
C11_____________________0.1uF 63V see text
C12_____________________ 100uF 16V Electrolytic Capacitors
C13_____________________ 100uF 25V Electrolytic Capacitors

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Subwoofer Filter Circuit Board

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