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

    Created by Md jony islam

    Series Capacitor Calculator

    120-165 Charactor This tool calculates the overall capacitance value for multiple capacitors connected either in series.

    calculate series capacitor

    Capacitor Series Connection in Circuit

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    Series Capacitor CalculatorI3I230 µFCnI1Power Supply+-C2C1© Online Works Tools15 µFCt = 10 µF
    Fig-1: Series Capacitor Circuit
    Ω
    • millohms (mΩ)
    • ohms (Ω)
    • Kiloohms (KΩ)
    • Megaohms (MΩ)
    • Gigaohms (GΩ)
    H
    • henry (H)
    • millihenry (mH)
    • microhenry (µH)
    • nanohenry (nH)
    • picohenry (pH)
    Hz
    • Hertz (Hz)
    • Kilohertz (kHz)
    • megahertz (mHz)
    • gigahertz (gHz)
    • terahertz (tHz)
    • revolutions per minute (RPM)

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    What is the Low-pass Filter?

    The cutoff frequency for RC (resistor-capacitor) and RL (resistor-inductor) low-pass filters can be easily calculated using our Low Pass Filter RC, RL Calculator for online tools. It offers dependable results for filter design tasks and is user-friendly enough to accommodate both novice and experienced engineers for calculators.

    🙋 Try our digital filter design tool online . If you want to learn more about conversions using Electronic Engineering Project Calculators.

    What is an RC Low-pass Filter? - RC Low-pass equations:

    calculate the cutoff frequency for both RC low-pass filters using simple formulas.

    How to Calculate Cutoff frequency?

    The cutoff frequency (fc) is where the output signal power drops to half (or -3dB) of the input power. It is given by:

    fc = 12𝜋RC

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

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

    How to Calculate Capacitor?

    The capacitor is where the out-signal power drops to the power. It is given by:

    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?

    The Resistor is where the out-signal power drops to the power. It is given by:

    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:

    An RL high-pass filter is created from a resistor (R) and an inductor (L) connected in series. This output is taken across the resistor after the input signal is given in the combination of the two resistors. At higher frequencies, the output signal of the resistor traverses through it, while the inductor output signal confines the same at lower frequencies.

    How to Calculate Cutoff Frequency Formula:

    The cutoff frequency (fc) is the frequency at which the output signal is reduced to 70.7% of the input signal. It is given by:

    fc = R2𝜋L

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

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

    How to Calculate Inductance?

    The inductance is the inductor at which the output signal is reduced to the input signal. It is given by:

    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?

    The Resistor is where the out-signal power drops to the power. It is given by:

    R = 2𝜋Lfc

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

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

    Low Pass Filter RC, RL Calculator

    A basic electronic component, which is popular in the world wide web, a low-pass filter reduces voltage amplitudes at higher frequencies allowing only low frequencies to pass through. A precise calculator is beneficial when laying out circuits that give good sound or smoothing voltages, as well when working on AC systems.

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    Low-pass Filter Features

    RC Filter Calculation: Input resistance and capacitance values to determine the cutoff frequency.

    RL Filter Calculation: Calculate the cutoff frequency by entering resistance and inductance values.

    Step-by-Step Process: Understand the calculations with clear explanations for each step.

    Example Problems: Learn with practical examples to strengthen your concepts.

    Low-pass Filter conversion application

    Frequently Asked Questions - Low-pass filter Conversion FAQs:

    What is a low-pass filter?

    A low-pass filter allows low-frequency signals to pass through while blocking higher frequencies.

    How does an RC low-pass filter work?

    An RC filter uses a resistor and capacitor to create a cutoff frequency where high frequencies are attenuated.

    What is the cutoff frequency?

    The cutoff frequency is the frequency at which the filter begins to attenuate the signal.

    What are common applications of low-pass filters?

    They are used in audio systems, power supplies, and communication devices.

    What units are required for inputs?

    Enter resistance in ohms, capacitance in farads, and inductance in henrys.

    What is the total capacitance of three 100 microfarad capacitors in series?

    The capacitance value is lower when capacitors are put together in series. When three 100 µF capacitors are put in series, the result is 1/C = 1/300000 + 1/300000 + 1/300000. So, 1/C = 1/100 + 1/100 + 1/100 = 3/100. Therefore, the total capacitance is about 33.33 microfarads.

    How much is the total capacitance of a 20 microfarad and a 50 microfarad capacitor in series?

    Applying the series capacitance equation (1/C = 1/C₁ + 1/C₂) to this example, we find that 1/C = 1/20 + 1/50 = (5 + 2)/100 = 7/100. The total capacitance is therefore about 14.29 microfarads.

    How do you calculate total capacitance in series?

    To get the overall capacitance (C) in series, use the inverse of C and add the inverses of each capacitance (C₁, C₂, C₃, etc.). The rule is true for any number of capacitors linked in series. The overall value is smaller than the smallest capacitor involved.

    Why does capacitance decrease in a series circuit?

    While capacitance stays the same, voltages split across each capacitor in series. So, there is less room for energy in the system, which means a smaller capacitance. Just as resistance can be added in parallel, when you add a second RLC circuit, it does the same thing as the first, but now with more RLC components running in parallel.

    What is a capacitor and what does it store?

    A capacitor holds energy by storing electrical charge between two parallel plates. It can hold an electric charge until needed and then release it, which is why it is used in timing, filtering, and power management.

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    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.