Active Band-Pass Filter Circuit Diagram & Design Guide #1645676 (License: Personal Use)

This schematic depicts a classic multiple-feedback (MFB) active band-pass filter configuration, where the green block forms the frequency-selective input network (R₁, R₂, C₁, C₂), and the blue block houses the op-amp with feedback resistor R₃ and gain-setting resistor R₄ to control center frequency and Q-factor. The circuit rejects low and high frequencies while amplifying a narrow band around its resonant frequency, commonly used in tone control, biomedical signal conditioning, and communication systems.

Used in electronics education, datasheets, and design guides for analog filter implementation; matches user intent for understanding or building a tunable band-pass filter for audio processing or instrumentation.