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Equal Component Value Active Butterworth
Low Pass Filter Calculator

Enter Fc (required) and ONE of the component values in each colored group (R1 or C1 and R3 or R4) to calculate the remaining two filter component values.

Active Low Pass Filter
Cutoff Frequency (Fc):
Filter Resistor Values (R1 = R2):
Filter Capacitor Values (C1=C2):
Feedback Resistor Value (R3):
Feedback Resistor Value (R4):
Gain (G): 4 dB
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