This circuit was found in ancient American documentation. It makes use of the operational amplifiers of the time, but it can be implemented with modern equivalents.
This circuit was obtained from the March 1994 Electronics Now magazine. The circuit uses a common...
This good gain circuit was found in a Popular Electronics from April 1967. The transistors are...
Found in an Electronic World, this circuit is designed to control solenoids up to 5 A. The circuit...