Rejection filter

  
This narrowband filter using the 741 operational amplifier can provide up to 60 dB of rejection. With resistors equal to 100 K and capacitors equal to 320 pF, the circuit will reject 50 Hz. Frequencies within the range 1 Hz to 10 kHz may be rejected by selecting components in accordance with the formula
Rejection filter - schematic

To obtain rejections better than 40 dB, resistors should be matched to 0% and capacitors to 1%.




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