This circuit with automatic gain control was found in the July 1988 issue of Radio Electronics magazine. The circuit is based on a transconductance operational amplifier.
This circuit is from an old American publication, using transistors of the time and operating with a 48...
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...
Found in a QST magazine from the 90s, this circuit broadcasts on different amateur radio bands...