RC filter calculator
Cutoff frequency and time constant of a first-order RC filter, or the resistor for a target cutoff.
Cutoff from R and C
kΩ
nF
- Cutoff frequency (−3 dB)
- 159.155Hz
- Time constant τ = R·C
- 1000µs
Resistor for a desired cutoff
Hz
nF
- Required resistance
- 1.59155kΩ
How it works
A first-order RC filter attenuates by 3 dB at the cutoff frequency and then 6 dB per octave. The same formula applies to low-pass and high-pass; only the arrangement of R and C differs.
Formulas
- f_c = 1 / (2π · R · C)
- τ = R · C
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