Identify this OpAmp Circuit: Schematic Analysis and Common OpAmp Configurations

✨ The discussion centers on identifying a "mystery" OpAmp circuit, which is confirmed to be a Wien bridge oscillator. This oscillator uses an RC network as a frequency-selective feedback element to sustain oscillations. Some confusion arose with suggestions of a Schmitt Trigger configuration and instrumentation amplifier with bridge outputting square waves, but the consensus is that the circuit is a Wien bridge oscillator. It was noted that general-purpose operational amplifiers such as the LM358 can be used for such oscillator circuits, while the LM393 is not suitable as it is a comparator, not an OpAmp. The importance of selecting an OpAmp based on required output characteristics like frequency, amplitude, and impedance, and consulting datasheets, was also emphasized.