Active band-reject filter


Posted on Oct 18, 2012

A filter with a band-reject characteristic is frequently referred to as a notch filter. A typical circuit using a µ 741 is the unity-gain configuration for this type of active filter shown. The filter response curve shown is a second-order band-reject filter with a notch frequency of 3 kHz. The resulting Q of this filter is about 23, with a notch depth of - 31 dB.


Active band-reject filter
Click here to download the full size of the above Circuit.

Although three passive networks are used in this application, the operational amplifier has become a sharply tuned low-frequency filter without the use of inductors or large-value capacitors.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

LM12 Simple Power Amplifier
LED Audio VU Meter Circuit
Safety Measures in Constructing EMG Amplifiers
The audio analyzer based on LPC2148 designs
5v 10a output switching power supply
water detector circuit for your
AT89C51-12PI AT89C51 80C31 Microcontroller With 4K Bytes Flash Use AT89S51
The NOT gate
A simple passive logarithmic VU-meter
Noise making circuits



Top