This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the selected frequency. The power supply must be symmetrical.
We found this circuit in the March 1994 issue of Electronics Now magazine. The transistor is...
We discovered this circuit in an English magazine that no longer exists. The magazine is from...
This circuit was found in a Spanish magazine that no more existis, Mundo Electrónico, in a...