Low Pass Filter Calculator

Select Circuit Type:

RC Filter RL Filter LC Filter

RC Low Pass Filter

Resistance (R):

Capacitance (C):

Cutoff Frequency (f):

RL Low Pass Filter

Resistance (R):

Inductance (L):

Cutoff Frequency (f):

LC Resonant Circuit (Note: Low Pass RC/RL are more common as simple filters)

Inductance (L):

Capacitance (C):

Resonant Frequency (f):

[Bode Plot Placeholder]
(Calculation outputs would typically drive a plot here)

Low Pass Filter Explanation

A Low Pass Filter allows low-frequency signals to pass through while attenuating (reducing the amplitude of) high-frequency signals.

The cutoff frequency (often denoted as $f\_c$ ) is the point where the output power has dropped to half the input power (-3 dB point).

RC Low Pass Filter: Consists of a Resistor (R) and a Capacitor (C) in series with the output taken across the capacitor. The cutoff frequency is calculated as $f\_c \= \\frac\{1\}\{2\\pi RC\}$ .

RL Low Pass Filter: Consists of a Resistor (R) and an Inductor (L) in series with the output taken across the resistor. The cutoff frequency is calculated as $f\_c \= \\frac\{R\}\{2\\pi L\}$ .

LC Circuit: While LC circuits are used in filters (like higher-order filters), the simple first-order LC arrangement calculates a resonant frequency rather than a standard cutoff frequency. The resonant frequency is calculated as $f\_r \= \\frac\{1\}\{2\\pi\\sqrt\{LC\}\}$ .

LDR |