1. What is LC Cutoff Frequency?

The LC cutoff frequency is the frequency at which an LC (inductor-capacitor) circuit begins to attenuate signals. It's a fundamental parameter in filter design and signal processing applications.

2. How Does the Calculator Work?

The calculator uses the LC cutoff frequency formula:

Where:

• \( L \) — Inductance in Henrys (H)
• \( C \) — Capacitance in Farads (F)
• \( \pi \) — Mathematical constant Pi (~3.14159)

Explanation: The formula shows that cutoff frequency is inversely proportional to the square root of the product of inductance and capacitance.

3. Importance of Cutoff Frequency

Details: Cutoff frequency determines the frequency response of filters and is crucial in radio frequency applications, audio processing, and signal conditioning circuits.

4. Using the Calculator

Tips: Enter inductance in Henrys and capacitance in Farads. Both values must be positive numbers. For practical circuits, typical values are in microhenrys (μH) and microfarads (μF).

5. Frequently Asked Questions (FAQ)

Q1: What happens at the cutoff frequency?
A: At cutoff frequency, the output signal power is reduced to half (-3dB) of the input power.

Q2: How does changing L or C affect the cutoff frequency?
A: Increasing either L or C lowers the cutoff frequency, while decreasing them raises it.

Q3: Is this the same for both high-pass and low-pass filters?
A: Yes, the cutoff frequency formula is the same, but the filter type determines which frequencies are passed/attenuated.

Q4: What are typical applications of LC filters?
A: Radio tuning circuits, power supply filtering, audio crossovers, and noise suppression.

Q5: Can I use this for series LC circuits?
A: This formula calculates the resonant frequency, which is the same value as the cutoff frequency for parallel LC circuits.