This circuit will offer approx -44dB of rejection at 1750Hz. -3dB cut of points are 1630Hz to 1925Hz.
Q of the circuit can be increased at the cost of rejection by changing the value of R1, R3, R8 and R9 R = 470K - Q=9 / Rejection = -44dB R = 560K / Q=12 / Rejection = -38dB R = 820K / Q=15 / Rejection = -35dB R = 1M / Q = 20 / Rejection = -31.5dB
1750Hz Notch Filter.GIF
Description: GIF image
