This circuit is used in transceivers, enabling input selection by diode switching through polarity reversal. The circuit is from an old American documentation on telecommunications.
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
September 2017 - Panasonic Dy2L TVS diodes for network applications, security, medical equipment,...
This short-range circuit for the AM NW range was found in a 1960 Sylvania transistor manual. The...