In the figure we have the configuration of series regulator protector suggested by Motorola in 1968 documentation. The transistors are of the time, being able to be used modern equivalents.
This signal follower, from a publication from the 1970s, uses old germanium transistors such as...
Although it is a common configuration today, this circuit was taken from an old publication. The...
This circuit for the 85 to 95 MHz band has a gain of 15 dB. We find it in a 1980s documentation. The...