1) from the circuit diagram, can anyone help me calcuate the cut of frequency of the both filter and show me the calculations ? as i don really understand what filter is that. from what i know, both of them are RC low pass filter.

2) is that IIR filter or FIR filter ?

3) are both the filter RC low pass ?

4) where is the refrence point for this circuit? is this circuit grounded ?

sorry for so many questions.

and thanks for those who help!