1. The problem statement, all variables and given/known data I need to remove a DC offset as apart of my research project I'm doing for my CS professor and his research group. This signal is a sine wave, 10 Hz, riding on a +1V DC offset. 2. Relevant equations I'm utilizing a high-pass filter using a series RC. f = 1 / 2*pi*R*C - this is the cutoff frequency (ideal). I realize that practical filters do not cutoff exactly at this frequency, rather over a range of frequency. 3. The attempt at a solution Input = 10sin(10t) + 1V = x(t) So, I know that DC is 0 Hz. Through my research, it seems that choosing the proper R and C values (close to the standard element values that you can buy from an electronics store), it would make sense that to block a 0 Hz signal, you "ideally" need to design the filter so the cutoff frequency is > 0 Hz. However, for practical and lab purposes, what frequency should I select as the 'cutoff frequency'? Do I select a random frequency above 0 Hz, with some room for leeway? I know that it will block it, but is there some sort of "rule" I must follow as to choosing the proper cutoff frequency? As of now, I could say f = 1 / 2 * pi * R * C. f = 5 Hz (Ill choose this) C = 0.1uF therefore, R = 318kOhm. The closest standard R value is 31.6kOhm. Is this a good approach? --- Also, is there a difference in using a simple series RC circuit or a differentiator high pass circuit? I know the gain is modified (inverted), but if I take care of that, is there any *real* advantage of using one? My connections would be: Vin -- C -- R -- Inverting Input GND -- Noninverting Input Output feedback --- Resistor --- Inverting Pin and power supply for the OpAmp.