In this circuit we have the way to use two transistors as a regenerative pair simulating an SCR. The circuit is from a 1965 General Electric documentation.
This circuit is from Motorola's Linear Interface ICs from 1993. The MC1723 is the equivalent of...
This variable power supply circuit was found in a German publication from the 1980s. The circuit is...
This audio amplifier stage was found in a 1963 publication. The circuit was designed to use...