Electronics
Filter Calculator
Calculate RC low-pass and high-pass filter values
RC Filter Calculator
Filter Type
Cutoff Frequency (fc)
1.59 Hz
-3dB @ fc
Filter Behavior
• Frequencies below 1.59 Hz pass through
• Frequencies above 1.59 Hz are attenuated
• Used for noise filtering, audio smoothing
Common Frequencies
20 Hz Bass
C = 0.796 µF
1 kHz Mid
C = 0.016 µF
10 kHz Treble
C = 0.002 µF
20 kHz Human hearing limit
C = 0.001 µF
Formulas
fc = 1 / (2π × R × C)
C = 1 / (2π × R × fc)
R = 1 / (2π × C × fc)
About RC Filters
• 1st order RC filter: -20dB/decade (6dB/octave) slope
• Signal drops to 70.7% at cutoff frequency (-3dB)
• Low-pass: Capacitor at output, High-pass: Capacitor at input
💡 Tip: For sharper filtering, use multi-stage (2nd, 3rd order) filters
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