This circuit was found in ancient American documentation. Equivalent operational amplifiers can be used. The power supply must be symmetrical. The circuit provides an average output.
We find this circuit in an American 1980s documentation. Integrated circuits are uncommon today as...
Found in a 90's EDN this circuit can be used as a shield. The transistor is a general-purpose type and the...
We found this circuit in a 70s publication. Transistors are general-purpose types of the time. The...