RC FILTER

A RC filter, also known as a resistor-capacitor filter or a passive low-pass filter, is an electronic circuit designed to pass signals with a frequency lower than a certain cutoff frequency while attenuating signals with frequencies higher than the cutoff frequency.

The RC filter consists of a resistor (R) and a capacitor (C) connected in series or parallel configuration. The resistor limits the current flow, and the capacitor stores and releases electrical energy. The interaction between the resistor and capacitor allows the filter to affect the frequency response of the circuit.

There are two main types of RC filters:

Low-pass RC filter:

This type of filter allows low-frequency signals to pass through while attenuating higher frequency signals. The cutoff frequency (also known as -3dB frequency) is the frequency at which the output signal is reduced to 70.7% (or -3 dB) of the input signal's amplitude.

High-pass RC filter:

In contrast to the low-pass filter, a high-pass RC filter allows higher frequency signals to pass through while attenuating lower frequency signals.

RC filters find applications in various electronic circuits such as audio amplifiers, power supplies, signal conditioning circuits, and communication systems to remove unwanted frequency components or noise from signals. They are simple, cost-effective, and widely used in electronic design.

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