This simulation demonstrates the working of a BJT differential amplifier under dynamic signal conditions. Two matched transistors share a common emitter resistance, forming a long-tailed pair. When a sinusoidal input is applied, the tail current remains almost constant, forcing current redistribution between the two transistors. As one transistor conducts more, the other conducts less, producing equal-magnitude but opposite-phase outputs at the collectors. The waveform plot clearly shows this ph