RL Filter Cutoff Calculator
Calculate the -3 dB cutoff frequency of an RL filter.
Ω
mH
Cutoff Frequency
15,915.5 Hz
Time Constant (L/R)0.0100 ms
Cutoff Frequency vs Resistance
RL Filter Cutoff
f_c = R / (2 x pi x L)
Time constant tau = L/R. An RL low-pass passes DC and attenuates high frequencies.
Example Calculation
R = 1k, L = 10 mH.
- 01L = 0.01 H
- 02f_c = 1000 / (2pi x 0.01) = 15,915.5 Hz
- 03tau = 0.01 / 1000 = 0.01 ms
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