This circuit shows how to make an adaptation on an AM receiver to receive CW and SSB signals. The circuit is from an 80's documentation. The diode is commonly used.
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...