This first-order high pass filter is applicable to any operation requiring a dual power source. It was found in the March 1997 Electronics Now magazine.
This two-transistor metal finder was found in a Raytheon manual from the 1950s. The transistors are...
This circuit was found in a 1966 EEE. The circuit can be implemented with modern general-purpose...
This charger was found in a General Electric circuit manual from the 1960s. The circuit is still...