active filters

Active filters are electronic devices that use powered components like transistors or operational amplifiers to modify signals. They are designed to selectively allow certain frequencies to pass while blocking others, much like a filter that separates desired from unwanted sounds. Because they use power, active filters can achieve sharper and more precise frequency filtering compared to passive ones, which rely only on resistors, capacitors, and inductors. They are commonly used in audio systems, communications, and electronics to improve signal quality by isolating specific signals or removing noise.