This circuit was found in a 90’s Popular Electronics. The circuit is used to analyze noise in vehicles. The output must be in a low impedance headset.
This simple circuit, which appears elsewhere on this site, was found in a transistor manual from...
We found this circuit in an old American Cookbook from 1974. In it, an operational one is used to...
This configuration from an American publication from the 1970s shows how to use a pair of power...