Found in Popular Electronics from the 1980s, this circuit uses two operational amplifiers from that time. The circuit has frequency and symmetry adjustment.
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...