It actually consists of a tunable field strength meter. The circuit is of an old documentation and the circuit must be tuned to the frequency to be monitored. The circuit offers the option to use a headset.
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We found...
This stage for JFETs was found in a 1965 US publication, but is valid for modern components. |...
This circuit is from the 1990 Motorola Linear Databook. The integrated circuit used is the LF355,...