200 Hz Transistor Tunable Filter (CB1457E)

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Published: Wednesday, 11 March 2020 16:28

Written by Newton C. Braga

 This circuit is from a 1975 technical documentation on filters. The FET can be a BF245 and the bipolar BC558. The power supply must be symmetric. The components can be changed for operation at other frequencies. The rejection is 3 dB in a 10 Hz range.