This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
The component used in this circuit is uncommon today, as the circuit was obtained from Motorola's Linear...
This circuit was found in General Electric documentation from the 1980s. The circuit is intended...
Taking advantage of the two stable states of a tunnel diode it is possible to build a switching circuit...