Operational Amplifier as Adder & Subtractor

The Operational Amplifier as Adder & Subtractor from Glass Agencies under the EROSE brand is an educational and laboratory apparatus designed to demonstrate the practical applications of operational amplifiers in performing arithmetic operations on analog signals. This apparatus provides students, trainees, and researchers with hands-on experience in understanding how op-amp circuits can be configured to sum multiple input voltages or subtract one voltage from another, which is essential in analog computation, signal conditioning, and electronic instrumentation. The setup consists of a carefully assembled circuit with operational amplifiers, precision resistors, and clearly labeled input and output terminals, allowing users to easily construct and analyze both adder and subtractor configurations. In the adder mode, the operational amplifier produces an output voltage proportional to the weighted sum of the input voltages, demonstrating how multiple signals can be combined in analog form for applications such as signal mixing, audio processing, and data acquisition. In the subtractor mode, the op-amp generates an output voltage corresponding to the difference between two input voltages, illustrating the principles of differential amplification and error detection, which are widely used in sensor signal processing, instrumentation, and measurement systems. A regulated power supply ensures stable operation, while built-in protective features prevent damage from overvoltage, overcurrent, or incorrect connections, making the apparatus safe for repeated use in classrooms, laboratories, and research environments. Accessible test points allow observation of input and output signals using oscilloscopes, multimeters, or data acquisition systems, enabling detailed analysis of amplitude, linearity, and circuit behavior. By varying input voltages and resistor values, learners can explore the effects on output magnitude, polarity, and gain, gaining practical insight into operational amplifier applications, precision signal manipulation, and analog arithmetic operations. The compact and robust construction ensures durability, stability, and long-term usability in educational institutes, technical training centers, and electronics laboratories. Glass Agencies follows strict quality control standards to guarantee accurate, reliable, and safe operation. The Operational Amplifier as Adder & Subtractor apparatus provides a comprehensive and interactive platform for studying analog signal arithmetic, waveform processing, and applied op-amp circuit design.