Operational amplifiers, or op-amps, have many applications in electronics. One area in which op-amps are commonly used is electronic instrumentation equipment, and technicians who test and repair that equipment will encounter op-amp circuits in many phases of their work. It is essential that technicians be able to identify op-amps and understand how they work so that they can repair electronic circuits and restore instrumentation equipment to service. This course provides an introduction to op-amps and their basic characteristics. The course covers five common op-amp circuits: voltage followers, inverting amplifiers, non-inverting amplifiers, differential amplifiers, and instrumentation amplifiers.