This is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s documentation. CN is the neutralizing capacitor.
The original purpose of the figure circuit, suggested by National Semiconductor, is to keep the...
The amplifier shown in the figure was obtained from the Anlog Devices linear integrated circuits...
When the sensor X1 is opened, the relay is energized. When waiting, the current drained is very...