passive filters

Passive filters are electronic components that selectively allow certain frequencies to pass through while blocking others, using only passive elements like resistors, capacitors, and inductors—no power sources are needed. They are commonly used in audio systems, radios, and communication devices to eliminate unwanted noise or interference, enhancing signal clarity. For example, a low-pass passive filter lets low-frequency signals pass but blocks high frequencies, ensuring audio bass sounds are clear without high-pitched noise. These filters are reliable, cost-effective solutions for controlling frequency responses in various electronic circuits.