DIFFERENTIAL AMPLIFIER: A differential amplifier built using two NPN BJTs. It is powered by a dual ±20 V supply and uses matched resistors for symmetry. The circuit amplifies the difference between two input signals—one at 1 kHz and the other at 2 kHz—while rejecting any common-mode signals. The shared emitter resistor (100 Ω) provides negative feedback, improving linearity and stability. Differential amplifiers like this are commonly used in analog signal processing @and the input stages of op-

This simulation demonstrates the working of a Differential Amplifier, a fundamental building block in analog electronics. It uses two input signals of different frequencies (1 kHz and 2 kHz) and shows how the amplifier outputs the difference between them. The waveform at the output clearly highlights the differential nature, amplifying only the difference while rejecting any common signals. This circuit is widely used in sensor interfacing, audio processing, and operational amplifier configurati