This circuit was obtained in a 90s documentation. However, it can be developed with modern operational amplifiers. The power supply must be symmetrical.
This circuit is from an English publication from 1973, but can be easily assembled today. 2N718 can...
The integrated circuits used in this 1989 project are uncommon today, including the IF coil that...
We found this receiver for the 144 MHz band in a European publication from the 1970s. The circuit...