I am new in designing the active filters though I designed Active low, high and bandpass and notch filter successfully (using Opamp, R and C). But these filters are not actually designed by me :-( I am using the online tool to design them.
When initially I designed a normal active low pass filter by seeing its general diagram and then calculating the value of R and C as per my cut off frequency. This filter works fine when I am seeing its result by using function generator as input. But I wanted to design it for an audio signal so when I gave an audio signal as input then my whole signal is vanished out. Because of this, I moved to the online tool.
So I wanted to know the impact of the resistance and capacitor on the input/output signal. What are the criteria for choosing the values of the components? For Eg. A cutoff frequency of 500Hz has many pairs of R and C which give 500Hz.
It will be great to hear your thoughts on this. As I wanted to get deep knowledge in the filter design as these are one of the important circuits in the electronics field.
I am attaching this schematic of low pass filter for 500Hz cutoff frequency which I designed by the online tool. But when I take some other random values of R and C then this circuit not works.