Rejection filter

Posted on Oct 26, 2012

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
Click here to download the full size of the above Circuit.

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

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