I have a circuit that adds a DC offset to an AC signal. From what I know, C1 and R2 form a high-pass filter. Since the input signal frequency is 50Hz, I would like to reduce the cut-off frequency of the filter as much as possible.
Ceramic capacitors with high capacitance are difficult to find, so instead I'm using high-valued resistors (with a buffer just before the ADC connected to the output).
I want to know whether R1 will affect the cut-off frequency of the filter. I found this similar question, but the answer doesn't give any explanation.
P.S - I would also appreciate if anyone can give suggestions on what type of capacitor to use, since I read electrolytic capacitors cannot be used with AC voltage.