The purpose of this circuit is to limit noise peaks on a radio receiver. The circuit is from an 80's documentation. The diode is commonly used and the circuit is applied to a receiver IF stage.
The presented circuit was found in the National Semiconductor FET Databook. The setting applies to other...
This configuration with the LM383 appears elsewhere on this site. The circuit shown was obtained...
This very high input impedance preamplifier is from a publication of 1977 but can also be mounted...