Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For Educators · Class-D Amp

Class-D Amp for a Bode plot

Built for educators teaching it to a class. Drop a live demo into a lecture or assign it as a shareable link — no lab installs. Simulate a Bode plot live below — adjust the inputs and watch it respond, right in your browser.

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.

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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.

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Filter Designer

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Analog Filter DesignerLive

RC & RLC frequency response

Controls

Presets

Resistance R (Ω)

Capacitance C (nF)

Passive filters shape a signal's frequency content with resistors, capacitors, and inductors. An RC low-pass or high-pass has a cutoff at 1/(2πRC) where the response drops 3 dB; an RLC bandpass resonates at 1/(2π√(LC)) with sharpness set by its quality factor Q.

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Data Inspector

Cutoff fc1.6 kHz

Resonance f₀5.0 kHz

Quality factor Q0.32

Governing equation

∣ H (f) ∣ = \frac{1}{1 + ( f /1592 ) ^{2}}

Reading this result: Low-pass: signals below the 1.6 kHz corner pass, above it they roll off at 20 dB/decade, and the response is exactly 3 dB down right at the corner.

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Frequently asked questions

Is this good for educators?: Yes — this version of "Class-D Amp for a Bode plot" is framed for educators teaching it to a class. Drop a live demo into a lecture or assign it as a shareable link — no lab installs.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.