The voltage gain of these capacitors on IC 1 and 2 can be adjusted by varying the value of Resistor R1 and R2 respectively. The low cut-off frequency of our amplifier depends on the value of these capacitors if the value is increased the starting time will be delayed. These capacitors are called feedback capacitors. I have connected the capacitors C13 and C14 on the first IC and in the same manner C23, and C16 for the second IC, to the IC pins 1 and 7. Hence, we will be building a PCB at home by designing an Audio Amplifier PCB for this circuit. Because of the high-power nature of the circuit, it is not recommended to used a breadboard to build this circuit. The complete 4440IC Amplifier circuit diagram is shown in the image below. Most of the components used should be available easily since they are commonly used in audio amplifier circuits. The Complete Stereo Audio Amplifier Bill of Materials is listed below. Materials Required for 40W Dual IC Stereo Audio Amplifier The internal block diagram and pinout image is shown below More technical details along with performance graphs can be found in the Datasheet of LA4440 IC. To prevent this problem the LA4440 IC provides a good channel separation When a single IC package contains more operational amplifiers (LA4440 IC has 2 channels), one operational amplifier affects the performance of another operational amplifier. The LA4440 IC provides a good ripple rejection value of 46dB. To overcome this problem, a filter is employed which helps in rejecting this noise/ripple. Ripple is the variation of the voltage and current over a steady-state value which can be changed with the load, this causes the noise at the output end of the circuit and thereby lead to distortions. What is Ripple Rejection and Why is it Important?
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