This -3dB cutoff frequency calculator calculates the -3dB cutoff point of the frequency response of a circuit, according to the formula, fC=1/(2πRC) .
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The cutoff frequency is defined as the frequency where the amplitude of H(jω) is 1√2 times the DC amplitude (approximately -3dB, half power point). Solve it for ωc (cutoff angular frequency), you’ll get 1RC. Divide that by 2π and you get the cutoff frequency fc.
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