How do I simulate an EMI filter?

Open this page and use the live Sensor Signal Chain tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.

Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.

Can I use my own numbers?

Absolutely — every input is adjustable, and with data import you can drive an EMI filter from your own measurements.

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Sensor Signal Chain for an EMI filter

Simulate an EMI filter live in your browser. This runs the real Sensor Signal Chain solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.

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Op Amp

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Op-Amp CircuitsLive

ideal amplifier configurations

Controls

Presets

Input R1 (kΩ)

Feedback R2 (kΩ)

Input amplitude (V)

The op-amp is the fundamental building block of analog electronics. With negative feedback, its gain is set entirely by external resistors: an inverting amp gives −R2/R1, a non-inverting amp 1+R2/R1. An integrator uses a feedback capacitor to output the running integral of its input.

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Data Inspector

Configurationinverting

Gain-10.00×

Output-10.00 V

Statuslinear

Governing equation

A = - \frac{R _{2}}{R _{1}} = - \frac{100}{10} = - 10.00 \times

Reading this result: Inverting gain is −R2/R1 = -10.00×: the output is a scaled, flipped copy of the input, set entirely by the resistor ratio.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Aliasing

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Sampling & AliasingLive

the Nyquist theorem

Controls

Presets

Signal frequency (Hz)

Sample rate (Hz)

To capture a signal faithfully you must sample above twice its highest frequency — the Nyquist rate. Sample too slowly and a high frequency masquerades as a lower one: aliasing. Push the signal frequency above half the sample rate and watch the reconstructed wave collapse to a false, slower tone.

▶ Run in Python

Data Inspector

Nyquist frequency10.0 Hz

Statusproperly sampled

Apparent frequency3.0 Hz

Governing equation

f_{app} = f - f_{s} round (\frac{f}{f _{s}}) = 3.0 Hz, f_{N} = \frac{f _{s}}{2} = 10.0 Hz

Reading this result: Sampling at 20 Hz puts the Nyquist limit at 10.0 Hz. The 3 Hz signal sits below that, so it is captured faithfully and reconstructs at its true frequency.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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FFT

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Fourier Transform (FFT)Live

decompose a signal into frequencies

Controls

Build a signal from a few sine tones plus noise, and the discrete Fourier transform recovers exactly which frequencies are present — the foundation of all signal processing.

Presets

Tone 1 frequency

Tone 2 frequency

Tone 3 frequency

Noise

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Data Inspector

Samples256

Peaks at4, 9

TransformDFT

Governing equation

X_{k} = n = 0 \sum N - 1 x_{n} e^{- 2 π ik n / N} (N = 256, O (N lo g N))

Reading this result: The FFT splits this 2-tone signal into bins: each input sinusoid at 4, 9 appears as a distinct spike, and with noise at 0 the baseline between them stays clean.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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About this simulation

The full Sensor Signal Chain tool models an EMI filter with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.

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Other ways to simulate an EMI filter

Fourier Transform for an EMI filter Bode Plot for an EMI filter Filter Designer for an EMI filter PID Controller for an EMI filter Transmission Line for an EMI filter Op-Amp Circuits for an EMI filter

Frequently asked questions

How do I simulate an EMI filter?: Open this page and use the live Sensor Signal Chain tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
Is it free?: Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
Can I use my own numbers?: Absolutely — every input is adjustable, and with data import you can drive an EMI filter from your own measurements.