This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V batteries since it requires a symmetrical source.
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...