This circuit for the 40 MHz band was published in Radio Electronics magazine in December 1957. Its purpose was to monitor the signals of the Russian satellite launched at the time.
The thermistor used in this circuit must have a resistance at room temperature between 10 and...
This circuit is intend to be used with low impedance transducers like magnetic pick-ups for...
The interesting circuit shown in the figure can have its gain digitally controlled and have two...