We found this configuration in documentation from the 1980s. It applies to almost any operational amplifier and in this version requires a symmetrical power supply.
This filter can be implemented with almost any operational. The power suppply must be symmetrical. ...
This traditional circuit of old documentation uses a 0-1 mA milliammeter and has several scales....
This simple 2-transistor radio is from Radio Electronics in October 1952. The circuit outputs a...