The ETB-249 Butterworth Filter Trainer is designed for hands-on study and analysis of first and second-order Butterworth filters. The trainer enables learners to explore frequency response characteristics, filter design principles, and the behavior of low-pass and high-pass Butterworth configurations. Built with standard components and on-board power supply, it provides practical insight into filter circuit behavior in both analog signal processing and communication systems. Ideal for students in electronics, electrical, and communication engineering disciplines.