Adjustable Notch Filter Circuit Diagram. In applications where the rejected signal might deviate slightly
from the null on the notch network, it is advantageous to lower the Q of
the network. This insures some rejection over a wider range of input
frequencies. The figure shows a circuit where the Q may be varied from
0.3 to 50. A fraction of the output is fed back to R3 and C3 by a second
voltage follower, and the notch Q is dependent on the amount of signal
fed back.
A second follower is necessary to drive the twin `T` from a
low-resistance source so that the notch frequency and depth will not
change with the potentiometer setting.
Adjustable Notch Filter Circuit Diagram
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