Sallen-Key Filter

A Sallen-Key filter is an electronic circuit used to modify or filter signals by allowing certain frequencies to pass while blocking others. It uses operational amplifiers, resistors, and capacitors to shape the signal’s frequency response, making it useful in audio equipment, radio, and other electronic devices. Essentially, it acts like a selective barrier, permitting desired signals through and reducing unwanted ones, helping maintain signal clarity and quality in various electronic systems.