The operational amplifier used in this application is uncommon today. This Raytheon circuit can be designed with equivalent operational and the power supply must be symmetrical.
This MW bedside radio was found in an English documentation from 1989. It is based on a dedicated...
This timer, using the ZN1034E, is from a May 1987 Radio Electronics magazine. The circuit can...
This receiver using a FET appeared in a November 1957 Radio Electronics magazine. It is one of the...