This is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s documentation. CN is the neutralizing capacitor.
Found in a 1980s publication, this circuit uses an operational amplifier from that time. The...
This circuit was published in an Italian magazine Radio Elettronica in February 1976. The...
This constant current circuit was found in the October 1993 Electronics Now magazine. The current can...