An electric filter is a circuit that passes certain frequencies and rejects other frequencies. The simplest filters consist of two elements, RC and RL. A lowpass filter passes low frequencies and rejects high frequencies. A highpasss filter passes high frequencies and rejects low frequencies.
Filters are found in a variety of different applications but are most popular in audio and multimedia applications. A filter is an electronic network where the output voltage, current, or power varies in a predictable way with the input frequency. Filters can be designed to pass high frequencies, block low frequencies, pass only low frequencies, pass/block only a specific band of frequencies, or any other combination.
Power Line Filters
Sinusoidal Output Filters
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