First-Order Filter Comparison: RC vs RL
All Filters
RC Only
RL Only
fₓ: 1.00 kHz
R: 1.00 kΩ
Circuit
Type
R
C or L
fₓ Formula
RC Low-Pass
Output across C
1.00 kΩ
159 nF
1/(2πRC)
RC High-Pass
Output across R
1.00 kΩ
159 nF
1/(2πRC)
RL Low-Pass
Output across R
1.00 kΩ
159 mH
R/(2πL)
RL High-Pass
Output across L
1.00 kΩ
159 mH
R/(2πL)
RC and RL filters with the same fₓ have identical frequency response shapes — only the component type differs.
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