This receiver with earphone listening for the medium wave range was published in Radio Electronics magazine in February 1958. The circuit was powered by a 15 V battery.
This circuit is used in transceivers, enabling input selection by diode switching through polarity...
This configuration was found in an American publication from the 90s. Operators admit equivalents just...
This circuit was found in an Italian magazine Elettronica Prática of 1977. The transistors can be...