I have a question about an equation described on page 2 of the mini-tutorial where it says: "The corner frequency of the filter is set by the capacitor value and the value of R5 (F0 = 1/(2πR5C1))." Assuming that the values of R5=10K and C1=1uF, I got 15.90 Hz.
I understand that this corner frequency is low and the signal will be almost entirely attenuated at the output assuming 1 kHz at the input, but... this is not happening in the simulation. I simulated this circuit on LTSpice, its attached below.
Could someone explain me this equation with details? Where could I be going wrong?