Low pass filter subwoofer using LM324

This is a low pass filter subwoofer using IC 324 and some other components. which is mr Kunal Banerjee sent to me to publish on our site.It is very useful Thank you very much

The Schematic

PCB LAYOUT ORIGINAL
The PCB layout original

PCB SILK ORIGINAL
The PCB Silk original

The components list
//Capacitor///////////////////////
————————————
C1=0.47UF/25V (Polarised Capacitor)
C2=0.47/63V (Polarised Capacitor)
C3=0.47UF/63V (Polarised Capacitor)
C4=47UF/25V (Polarised Capacitor)
C5=0.22UF/63V (Polarised Capacitor)
C6=2.2UF/50V (Polarised Capacitor)
C7=470UF/16V (Polarised Capacitor)
C8=104 ACE (Ceramic Capacitor)
C9=473 AEO (Ceramic Capacitor)
C10=104 ACE (Ceramic Capacitor)
C11=104J (Polyester Capacitor)

//Resistor///////////////////////
————————————
R1=100K
R2=6.8K
R3=6.8K
R4=6.8K
R5=47k
R6=47k
R7=6.8k
R8=470-OHM
R9=4.7k
R10=6.8k
R11=100k
R12=100k
R13=6.8k
R14=100K- “POT”
R15=100k
R16=6.8k
R17=100k
R18=4.7k

//IC and IC-Holder///////////////////////
————————————
IC1=”LM324″
IC1 HOLDER=14 PIN ‘DIP’