A modified RC twin-T null network is discussed. It differs from the conventional circuit in that a wide range of notch frequency can be tuned by a single potentiometer. Closely matched components are not required and symmetric notch response is maintained as the frequency is tuned.
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References
1.
Andreyev, ‘Telecommunications’, No. 2, Pergamon Press Translations, p. 195 (1960).
2.
BudakA., Passive and Active Network Analysis and Synthesis, Houghton Mifflin, Boston, Chapter 10 (1974).
