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.
This circuit can generate signals from 2 to 15 MHz or 4 to 22 MHz depending on the used components...
This interesting configuration was found in a 1965s Electronic Design. It makes use of components of...
The figure shows how to obtain a digitally programmed resistance using the 4066. The circuit is...