How is the RC circuit simulated?

The RC circuit uses Euler forward integration of the first-order ODE dVc/dt = (Vin - Vc)/(RC) with a time step chosen as t/200 for stability. A square wave input drives the charging and discharging cycles, showing the exponential approach V(t) = V_s(1 - e^(-t/t)) on the oscilloscope display.

What is the LC resonance frequency?

The natural (resonant) frequency of an LC circuit is f0 = 1/(2pv(LC)). At this frequency, inductive and capacitive reactances are equal (XL = XC), and the circuit draws maximum current from the source. The quality factor Q = (1/R)v(L/C) determines the sharpness of the resonance peak � higher Q means narrower bandwidth.

What does the Filter Design preset show?

The Filter Design preset shows an RC lowpass filter with cutoff frequency f_c = 1/(2pRC). Below f_c, Vout � Vin (the capacitor charges quickly and tracks the input). Above f_c, the capacitor cannot charge fully each cycle, so Vout is attenuated. The capacitance slider sweeps the drive frequency relative to the cutoff, allowing direct observation of the lowpass attenuation behaviour on the oscilloscope.

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🧪 Circuit Simulator

Interactive circuit simulator with real-time oscilloscope display. Simulate RC charging, RL transients, LC resonance, AC phase shifts, lowpass filter Bode response, and BJT common-emitter amplifier behaviour. Six presets, resistance/capacitance/inductance sliders.

Electronics & Circuits2DModerate60 FPS

⚙ Under the hood

This simulation provides an interactive environment for experimenting with electronic circuits, including RC, RL, LC, AC, filter and BJT amplifier components. It allows users to explore basic circuit concepts and design simple circuits.

Circuit SimulatorRC Filters

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install