RC High Pass Filter Calculator | RL High Pass Filter Calculator | Cutoff Frequency & Values

    Created by Md jony islam

    High Pass filter Calculator

    RC high-pass filter allows high-frequency signals to pass while attenuating lower frequencies. This tool simplifies filter design and is ideal for audio processing, AC coupling, and noise reduction in communication systems. Perfect for students and engineers.

    Calculate RC, RL High Pass Filter

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    Series Capacitor CalculatorI3I230 µFCnI1Power Supply+-C2C1© Online Works Tools15 µFCt = 10 µF
    Fig-1: Series Capacitor Circuit
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    What is the High-pass Filter?

    🙋 Try our flip-flop input output calculator . If you want to learn more about conversions using Electronic Engineering Project Calculators.

    What is an RC High-Pass Filter? - RC High-pass equations:

    How to Calculate Cutoff frequency?

    fc = 12𝜋RC

    For Example, Resistor R = 2KΩ (2000Ω), Capacitor C = 12µF


    fc = 12𝜋 × 2000 × 12 or, fc = 6.631Hz

    How to Calculate Capacitor?

    C = 12𝜋Rfc

    For Example, Desired cutoff frequency fc 1 khz (10000hz), Resistor R = 10KΩ (1000Ω)


    C = 12 × 𝜋 × 10000 × 1000 or, C = 0.0159µF

    How to Calculate Resistor?

    R = 12𝜋Cfc

    For Example, Desired cutoff frequency fc 10 Hz, Capacitor C = 47µF


    R = 12 × 𝜋 × 47 × 10 or, R = 338.6Ω

    What is an RL High-Pass Filter? - RL High-pass equations:

    How to Calculate Cutoff Frequency Formula:

    fc = R2𝜋L

    For Example, Resistor R = 30Ω, Inductance L = 200µH


    fc = 302 × 𝜋 × 200 or,fc = 23873Hz

    How to Calculate Inductance?

    L = R2𝜋fc

    For Example, Desired cutoff frequency fc = 1khz (1000Hz), Resistance R = 1KΩ (1000Ω)


    L = 10002 ×𝜋 × 1000 or,L = 0.159H

    How to Calculate Resistor?

    R = 2𝜋Lfc

    For Example, Desired cutoff frequency fc = 2khz (2000Hz), Inductance L = 200µH


    R = 2 × 𝜋 × 200 × 2000 or, R = 2.51Ω

    What is an RC High-Pass Filter?

    RC High-Pass Filters conversion application

    RL High-Pass Filters conversion application

    Frequently Asked Questions - High Pass filter Conversion FAQs:

    What is an RC high-pass filter?

    It's a circuit that allows high-frequency signals to pass while attenuating low frequencies.

    What components are needed for an RC high-pass filter?

    A resistor and a capacitor are required to design this filter.

    Can I use this calculator for audio filters?

    Yes, it's ideal for designing audio filters to remove bass frequencies.

    Can I adjust both R and C for the same cutoff frequency?

    Yes, different combinations of R and C can achieve the same fc

    What is the role of the capacitor in the filter?

    The capacitor blocks low-frequency signals and passes high frequencies.

    What is an RL high-pass filter?

    It's a circuit that allows high-frequency signals to pass while attenuating lower frequencies using a resistor and an inductor.

    What are the main components of an RL high-pass filter?

    A resistor (R) and an inductor (L).

    Why is the output taken across the resistor?

    The resistor allows high frequencies to pass, while the inductor blocks low frequencies.

    What is the role of the inductor in the filter?

    The inductor blocks low-frequency signals, ensuring only high frequencies pass.

    How do I calculate a high pass filter?

    When finding a high-pass filter, use fc = 1 / (2πRC), where fc stands for cutoff frequency, R is resistance in ohms, and C is capacitance in farads. It allows frequencies higher than fc to pass, while keeping frequencies less than fc out. Decide on values corresponding to the frequency you wish to have.

    What should I set my high pass filter to?

    Place the high-pass filter cutoff frequency at a frequency slightly above the one you want to keep. With audio tracks, voice can be mixed at 80–120 and 100–150 Hz, guitars around 100 Hz, and music can go as low as 80 Hz. The idea is to get rid of the low-end rumble—yet still keep the needed signal detail.

    How do I calculate a low pass filter?

    The idea behind the low-pass filter is to turn fc = 1 / (2πRC), like it is for the high-pass filter. It ensures signals below the cutoff frequency (fc) pass, but those above are blocked and reduced. Use the values of R and C so that your circuit offers a maximum passable frequency that matches your goal.

    What is the difference between high pass and low pass filters?

    A high-pass filter enables high frequencies to pass through and blocks low frequencies, but a low pass filter lets low frequencies pass instead. The two are applied in audio, electronics, and signal processing to give the desired frequency response.

    Where are high pass and low pass filters used?

    Reducing low-frequency noise is accomplished using a high-pass filter in audio mixing, which is used for interference suppression in RF and to smooth data. By using low-pass filters, digital signals are made cleaner, hiss in music is eliminated, and signals that change slowly are separated in control systems. They are both needed for work in electronics and DSP.

    About the Author

    Md Jony Islam

    Md Jony Islam: Multidisciplinary Engineer & Financial Expert:

    Md. Jony Islam is a highly skilled professional with expertise in electronics, electrical, mechanical, and civil engineering, as well as finance. Specializing in transformer service and maintenance for 33/11kV substations, he ensures reliable and efficient electrical systems. His mechanical engineering skills drive innovative designs, while his financial acumen supports effective project budgeting. With a strong foundation in civil engineering, he contributes to robust infrastructure development. Md. Jony Islam's multidisciplinary approach ensures efficiency, quality, and reliability across all projects.