Simulator Library
Electromagnetics and Circuit Simulators
Electromagnetic and circuit simulators for fields, circuits, RF, microwave, power electronics, motors, and transformers.
149 simulators
Related topics in this field
Adjacent categories
Simulator list
AC Circuit Impedance Simulator — RLC Series/Parallel, Resonance & Bode Plot
Circuits
Calculate impedance, resonant frequency, Q-factor, and phase angle for RLC series/parallel circuits in real time. Visualize Bode plot and phasor diagram to intuitively u…
Series RLC Circuit Simulator — AC Impedance and Resonance
Circuits
A resistor R, inductor L and capacitor C are connected in series with an AC source. Sweep the frequency f and watch impedance |Z|, phase angle, resonance frequency f0 an…
ADC Quantization Noise & SNR Simulator
Circuits
Every analog-to-digital converter has to round a continuous voltage to one of 2^N discrete codes.
ADC Sampling Jitter SNR Simulator
Circuits
See how jitter erodes SNR at high input frequency through waveform samples, an SNR curve, and an error cloud.
Ampere Law Simulator — Magnetic Field of Straight Currents and Solenoids
Real-time computation of the field around an infinite straight wire $B = \\mu_0 I/(2\\pi r)$, the uniform interior field of a solenoid $B = \\mu_0 n I$, and the force pe…
Antenna Array Beamforming Calculator
RF & Microwave
Calculate the array factor for a linear phased array. Set elements, spacing, scan angle, and window. Visualize the polar radiation pattern in real time.
Antenna Basics · Dipole Antenna Calculator
RF & Microwave
Compute resonant length, radiation resistance, gain, VSWR and free-space path loss for half-wave dipole, monopole, loop and patch antennas. Real-time polar radiation pat…
Friis Transmission Equation Simulator
RF & Microwave
Compute the received power of a radio link travelling through free space with the Friis transmission equation.
Antenna Gain & Directivity Simulator — Friis Transmission Equation
RF & Microwave
Simulate antenna gain, directivity, and link budget instantly. Adjust frequency, power, and distance to compute Friis transmission and free-space path loss.
Antenna Radiation Pattern Simulator
RF & Microwave
Simulate and visualize antenna radiation patterns in real-time for dipoles, arrays, and Yagis. Compute gain, HPBW, and side lobe levels automatically.
Antenna Radiation Pattern Visualizer — Directivity, Gain & HPBW Calculator
RF & Microwave
Visualize antenna radiation patterns in real time. See polar charts for dipole, monopole, patch & Yagi-Uda antennas with directivity calculations.
Arc Flash Hazard Analysis Tool — IEEE 1584 Incident Energy Calculator
Power Electronics
Calculate arc flash incident energy and required PPE instantly. Enter voltage, fault current, and distance per IEEE 1584-2018 for fast, accurate safety analysis.
Resistive Attenuator Pad Simulator
RF & Microwave
Design a resistive attenuator pad (T or π) that reduces a signal by a fixed number of dB while keeping the system matched to its characteristic impedance Z₀.
Band-Pass Filter Simulator — Series RLC Resonance and Q-factor
Circuits
Real-time series RLC band-pass filter simulator. Get resonant frequency, Q-factor, bandwidth, gain and phase, with a live Bode plot and circuit waveforms.
Biosensor EIS (Electrochemical Impedance Spectroscopy) Simulator
Circuits
Compute the Randles equivalent circuit response for a label-free biosensor and watch the Nyquist semicircle plus Warburg tail update in real time.
Biot-Savart Law Simulator — Magnetic Field of a Circular Current Loop
Biot-Savart law simulator: real-time on-axis magnetic field B(z) of a circular current loop (current I, radius R, turns N) with center field B(0) and half-width.
BJT Amplifier AC Analysis (CE/CB/CC)
Circuits
Analyze BJT amplifier AC performance: voltage gain, impedance, and Bode plots for Common Emitter, Base, and Collector configurations. Compare key formulas.
Boost Converter Duty Cycle Simulator
Power Electronics
Compare duty curve, inductor current, and device stress to see the cost of higher boost ratio.
Branch-Line Coupler Simulator
RF & Microwave
Design the 3-dB branch-line coupler (quadrature hybrid) that splits one RF signal into two outputs of equal amplitude and a 90° phase difference.
Buck Converter Ripple Simulator
Power Electronics
Use switching waveform, ripple map, and power view to see when L, C, or switching frequency is insufficient.
Busbar Sizing Simulator
Power Electronics
Size the copper and aluminium busbars that distribute heavy currents inside switchgear and distribution panels.
Cable Voltage Drop Simulator
Power Electronics
When a load current flows through a power cable, the conductor's resistance pulls the voltage down.
RC Capacitor Charge/Discharge Simulator — τ=RC
Circuits
Simulate RC circuit charging/discharging. Adjust R, C, V₀ to instantly see exponential curves, time constant τ=RC, and key equations.
Charged Particle in Electromagnetic Field Simulator
Simulate charged particle motion in electromagnetic fields. Visualize orbits, Larmor radius, and E×B drift using real-time Lorentz force calculations.
Circuit Builder — Ohm's Law & Series/Parallel Circuits
Circuits
Visualize and simulate circuits with real-time Ohm's Law calculations. See electron flow and compute voltage, current, resistance, and power instantly.
Coaxial Cable Impedance Calculator — Z_0 and Propagation Speed
RF & Microwave
Change the inner radius a, outer inner radius b, and dielectric constant ε_r to see how the characteristic impedance Z_0, velocity factor, and per-unit-length capacitanc…
Coil Inductance Calculator (Nagaoka Coefficient & Wheeler Formula)
Calculate air-core solenoid inductance with exact Nagaoka coefficient method or Wheeler approximation. Compare both techniques for precision.
Coplanar Waveguide (CPW) Simulator — Characteristic Impedance Z_0
RF & Microwave
Visualize the characteristic impedance of a coplanar waveguide using the Wheeler/Hilberg elliptic-integral approximation. Change the center-strip width W, gap G and diel…
Transmission Line Corona Loss Simulator
RF & Microwave
Explore the corona discharge that forms around a high-voltage transmission-line conductor and the power loss it causes.
Coulomb Law Simulator — Electric Force Between Point Charges
Real-time Coulomb force F = k·q_1·q_2 / (ε_r·r²) between two point charges. Read off the electric field E, potential energy U, and attractive vs repulsive direction with…
Coulomb Force Visualizer
Adjust charge magnitudes and separation to compute Coulomb force
Crosstalk in Coupled Lines Simulator
Circuits
A tool for calculating the "crosstalk" that appears between two traces running side by side on a printed circuit board.
Differential Pair Impedance Calculator — USB / HDMI 100 ohm Routing
RF & Microwave
Instantly compute the differential impedance Z_diff, odd-mode Z_odd and even-mode Z_even of a surface microstrip pair from trace width, spacing, substrate height and die…
Half-Wave Dipole Antenna Simulator
RF & Microwave
Design the half-wave dipole — the most fundamental antenna and the reference against which every other antenna is measured.
Eddy Current Simulator — Skin Effect, Loss & Braking Force
Visualize eddy currents, skin depth, and losses. Explore induction heating, transformer design, and braking force simulation with this interactive CAE tool.
DC Circuit Simulator
Circuits
Set supply voltage and resistor values to analyze series/parallel circuits
Electric Field & Potential Simulator — Point Charge Superposition
Simulate electric fields and potential in real time. Place point charges and visualize field vectors and equipotential maps with this interactive physics tool.
PMSM Electric Motor Design Calculator
Power Electronics
Design PMSM motors with our dq-axis calculator. Model SPM/IPM types, adjust parameters, and compute torque, losses, and efficiency instantly.
Electric Motor Torque Simulator
Power Electronics
Calculate and visualize DC/BLDC motor torque, speed, and efficiency characteristics. Find operating point with load torque.
Electric Field & Potential Visualizer — Equipotential Lines & Field Lines
Visualize the potential distribution from multiple point charges on a red-blue color map. Draw equipotential lines and electric field vectors in real time to explore dip…
Electric Power Calculator — Phasor Diagram, Power Triangle & AC Power
Power Electronics
Visualize AC power relationships in real-time. Adjust voltage, current, and power factor to see dynamic phasor diagrams and the P-Q-S power triangle.
Electrical Grounding Resistance Calculator (IEEE 80 / Wenner)
Calculate grounding system safety per IEEE 80. Compute resistance, touch & step voltages, and GPR from soil resistivity and electrode geometry.
AC Induction Motor Simulator — Torque-Speed Curve & Efficiency
Power Electronics
Simulate three-phase AC induction motor performance. Set circuit parameters to compute real-time torque-speed curves, efficiency, and power factor.
Electromagnet Lifting Force Simulator
Circuits
Compute, in real time, how hard a current-carrying horseshoe electromagnet pulls on an iron plate.
Electromagnetic Coupling Simulator — Mutual Inductance & Transformer
Visualize electromagnetic coupling in transformers, wireless power, and inductive systems. Simulate mutual inductance M = k√(L₁L₂) for two-coil analysis.
Electromagnetic Induction & Faraday's Law Calculator
Explore Faraday's Law with an interactive simulator. Adjust coils and magnetic fields to visualize flux, EMF, and induced current in real-time.
Electromagnetic Shielding Effectiveness Calculator — Skin Depth, SE (dB)
Calculate electromagnetic shielding effectiveness instantly. Compare materials, thickness, and frequency for skin depth, absorption, reflection, and total SE (dB).
Electromagnetic Wave Simulator — E & B Field Visualization
Visualize electromagnetic plane waves in 3D. Adjust frequency, polarization, and medium to explore E & B field dynamics, wavelength, and phase velocity.
Electromagnetic Induction (Faraday's Law) Simulator
Visualize Faraday's & Lenz's laws in real-time. See magnetic flux and induced EMF as a magnet moves through a coil in this interactive simulator.
Flyback Converter Simulator
Power Electronics
Design the simplest isolated DC-DC converter — the circuit inside almost every AC adapter and phone charger. Adjust the input voltage, duty cycle and turns ratio to see …
Gauss's Law Electric Field Simulator
Simulate electric fields for line charges, planes, and spheres using Gauss's Law. Visualize and calculate field strength with this interactive physics tool.
Hall Effect Simulator — Charge Carrier Density Measurement
Compute the Hall voltage V_H in real time from current, magnetic field, carrier density and sample thickness using the Lorentz-force balance. Learn the principle behind …
High-Pass Filter Simulator — First-Order RC Filter Frequency Response
Circuits
Real-time first-order RC high-pass filter simulator. Get cutoff frequency, gain, phase and time constant, with a live Bode plot and AC-coupling waveform view.
High-Voltage Lightning Arrester Rating Simulator
Power Electronics
Design ZnO/MOV surge arresters for transmission systems per IEC 60099.
Hysteresis Loss & Magnetic Circuit Designer
Design magnetic circuits (toroidal, E-core, solenoid) with real-time calculations of flux, inductance, and core losses using the reluctance model.
Impedance Matching Simulator — Reflection Coefficient and SWR
RF & Microwave
Interactive impedance matching simulator. Set Z0, complex load ZL and transformer ratio N to compute reflection coefficient, VSWR and power efficiency on a Smith chart.
Three-Phase Induction Motor Calculator
Power Electronics
Calculate and visualize torque-speed curves for three-phase induction motors. Input circuit parameters to analyze performance and pull-out torque.
Inductor & RL Circuit Transient Response Simulator
Circuits
Visualize I(t) and V_L(t) in real time for energizing, de-energizing, and AC steady-state modes. Automatically calculates time constant τ, energy storage, reactance, imp…
Kirchhoff Laws Simulator — Series-Parallel Resistor Circuit
Circuits
A voltage source V feeds R_1 in series with the parallel combination of R_2 and R_3. The simulator visualizes the Kirchhoff voltage (KVL) and current (KCL) laws in real …
LC Circuit Oscillation Simulator — RLC Damped Oscillation
Circuits
Adjust L, C, and R to instantly visualize the damped voltage waveform and impedance resonance curve of an RLC circuit. Resonant frequency, Q factor, and decay time const…
LED Series Resistor Calculator
Circuits
Free LED current-limiting resistor calculator. From V_s, V_f, I_f and series count: ideal R, nearest E12 value, real current, resistor power and efficiency live.
Lightning Protection Design Calculator — Rolling Sphere & Protection Angle
Power Electronics
Calculate lightning protection zones using rolling sphere, angle, or mesh methods per IEC 62305. Supports levels I-IV with automatic ground resistance.
Wireless Link Budget Calculator (Friis Equation)
RF & Microwave
Calculate wireless link performance with the Friis equation. Compare BPSK vs. 64QAM, factor in rain, and compute power, SNR, margin, and range in real time.
Power System Load Flow Calculator (Gauss-Seidel)
Power Electronics
Calculate power flow in a 3-bus system using the Gauss-Seidel iterative method. Computes bus voltages, phase angles, line flows P/Q/S, and system losses in per-unit.
Logic Gate Simulator — AND/OR/NAND/XOR/Adder/Flip-Flop
Visualize logic gates and build circuits with auto-generated truth tables. Explore AND, OR, XOR gates, adders, and flip-flops in this interactive simulator.
Low-Pass Filter Simulator — First-Order RC Filter Frequency Response
Circuits
Real-time first-order RC low-pass filter simulator. Get cutoff frequency, gain, phase and time constant, and inspect the live Bode plot and circuit waveforms intuitively.
Magnetic Levitation Simulator (PID Control) — Earnshaw's Theorem
Experience magnetic levitation in a real-time simulator. Explore passive instability, active PID control stabilization, and the physics from Earnshaw's theorem.
Neodymium Magnet Flux & Force Air Gap Simulator
Design magnetic circuits using neodymium (N42/N52/N35SH) or ferrite magnets. Adjust magnet size, air gap, temperature, back-iron yoke and Halbach arrangement to see air-…
Magnetic Circuit & Reluctance Simulator
Circuits
Solve the magnetic flux flowing through the iron core of an electromagnet or inductor as a magnetic circuit built from reluctances.
Magnetic Field Lines Simulator — Pole Placement & Field Visualization
Visualize magnetic fields in real time. Place N/S poles to simulate dipoles, quadrupoles, and complex configurations. Build intuition for electromagnetism.
Solenoid Magnetic Field Simulator — B-field Distribution & Inductance
Vary number of turns, current, length, and relative permeability to calculate internal magnetic field, axial field distribution, and inductance in real time.
Magnetic Field Lines Simulator — Electromagnetic Visualization
Visualize magnetic fields in real time. Simulate wires and magnets to explore Ampere's Law and dipole fields. Interactive physics tool.
Lorentz Force & Charged Particle Motion Simulator
Visualize charged particle motion in EM fields. Animate electron/proton orbits, calculate Lorentz force, cyclotron frequency, and radius in real-time.
Magnetic Hysteresis Simulator — B-H Loop & Magnetization Curve
Simulate magnetic hysteresis loops in real time with the Jiles-Atherton model. Compute key parameters like coercivity, remanence, and energy loss for various materials.
Magnetic Levitation Stability Simulator — PID Control & Step Response
Simulate electromagnetic levitation with real-time PID control. Tune coil, gap, mass, and gains to explore closed-loop stability and step response.
Transformer Design Calculator — Turns Ratio, Efficiency & Voltage Regulation
Power Electronics
Calculate transformer parameters instantly: turns ratio, currents, losses & regulation. Input voltages and capacity for quick design results.
Magnetohydrodynamics (MHD) Simulator — Hartmann Flow
Explore how magnetic fields shape fluid flow. Adjust parameters in this MHD simulator to transform velocity profiles from parabolic to plug flow.
Mass Spectrometer Simulator — Mass Separation by Circular Motion in a Magnetic Field
Compute the ion speed v = sqrt(2qV/m), the circular-orbit radius r = mv/(qB), the mass-to-charge ratio m/q and the kinetic energy KE in real time from the charge number …
Microstrip Patch Antenna Simulator
RF & Microwave
Design the flat antenna that is simply a rectangle of copper etched onto a printed-circuit board: the microstrip patch antenna.
Microwave Filter Design Tool
RF & Microwave
Design Butterworth, Chebyshev & elliptic microwave filters. Visualize S-parameters & group delay in real-time with this advanced RF design tool.
Microstrip Transmission Line Calculator — Z0, εeff, λ/4 Length
RF & Microwave
Compute Z0, effective permittivity, guided wavelength, and conductor / dielectric loss in real time. Switch between analysis (W → Z0) and synthesis (Z0 → W) modes.
Microwave Transmission Line Calculator
RF & Microwave
Calculate characteristic impedance for coaxial, microstrip, and stripline. Smith chart visualization with VSWR and return loss.
Power MOSFET Switching Loss Simulator
Power Electronics
Calculate the switching loss and conduction loss of a power MOSFET used in DC-DC converters and motor drives in real time.
DC Motor Speed-Torque Characteristics Simulator
Power Electronics
Simulate DC motor performance: real-time speed-torque curves, efficiency, and starting current for PM, shunt, series, and BLDC motors.
Motor Starting Current Simulator
Power Electronics
Calculate the large starting current (inrush current) that flows the instant a three-phase induction motor is connected to the supply.
555 Timer Astable Simulator
Design a free-running oscillator built from a 555 timer IC in astable mode. Adjust resistors R1 and R2 and capacitor C to see the oscillation frequency, period, charge a…
Cascade Noise Figure (Friis) Simulator
RF & Microwave
Compute the total noise figure of a 3-stage RF receiver chain in real time with the Friis formula.
OFDM Subcarrier Simulator
RF & Microwave
Explore the physical layer of OFDM (orthogonal frequency-division multiplexing), the modulation shared by WiFi, 4G LTE and 5G. Adjust the subcarrier count, bandwidth, cy…
Ohm's Law & DC Circuit Simulator — Voltage, Current, Resistance
Circuits
Interactive simulator to visualize Ohm's Law. Adjust voltage, current, and resistance in real-time, then analyze series and parallel DC circuits.
Op-Amp Circuit Simulator — Inverting, Integrator, Differentiator
Circuits
Visualize and simulate inverting, non-inverting, summing, and other key op-amp circuits in real time. See gain, phase shift, and waveforms instantly.
Op-Amp Circuit Simulator
Circuits
Visualize and simulate inverting, non-inverting, summing, and other key op-amp circuits in real time. See gain, phase shift, and waveforms instantly.
LC/RC Oscillator Design Calculator
Circuits
Calculate oscillator frequencies for Colpitts, Hartley, Clapp, Wien Bridge, RC Phase Shift, and Crystal circuits with real-time formulas and criteria.
Per-Unit System Simulator — Power System p.u. Value Conversion
Power Electronics
Per-unit (p.u.) calculator for three-phase grids. Derive Z_base, I_base from V_base, S_base and normalize V, Z into dimensionless per-unit values in real time.
Phase-Locked Loop (PLL) Simulator
Circuits
Design a phase-locked loop (PLL) that synthesises a high, accurately-spaced frequency by multiplying a clean reference by the divider ratio N.
Phased Array Antenna Beam Steering Simulator
RF & Microwave
Steer an N-element phased array electronically — without any mechanical motion — by tweaking the per-element phase. Adjust element count, spacing, frequency, steering an…
Piezoelectric Transducer Coupling Coefficient (k) Simulator
Compute the electromechanical coupling coefficient k of a piezoelectric ceramic (PZT and similar) from the resonance frequency f_r and antiresonance frequency f_a using …
Piezoelectric Calculator
Calculate d33/d31 coefficients, charge sensitivity, thickness-mode resonance frequency, and electromechanical coupling factor k33. Material presets for PZT-4, PZT-5H, PV…
Power Cable Ampacity Simulator
Power Electronics
Design the ampacity — the maximum continuous current a power cable can carry. Change the conductor material, cross-section, insulation type, ambient temperature and inst…
Power Electronics Converter Calculator
Power Electronics
Calculate duty cycle, current/voltage ripple, and CCM/DCM mode for Buck, Boost, and Buck-Boost converters. Real-time results and waveform display.
Power Factor Correction Capacitor Calculator
Power Electronics
Calculate required capacitor bank size (kvar & μF) instantly. Input power, current PF, target PF, and voltage. Optimize your electrical system efficiency.
Switching Power Supply Designer — DC-DC Converter Calculator
Power Electronics
Design Buck, Boost, and Buck-Boost DC-DC converters. Calculate L, C, duty cycle, and efficiency in real time. Visualize the inductor current waveform and efficiency curv…
Power System Load Flow Calculator
Power Electronics
Simulate a 3-bus power network. Adjust generators, loads, and lines to instantly compute voltages, phase angles, and active/reactive power flows.
Poynting Vector Simulator — Plane Wave Power Flux
Circuits
The Poynting vector simulator computes the instantaneous and time-averaged intensity of a plane electromagnetic wave in vacuum from E0, frequency, position and time.
Quarter-Wave Impedance Matching Simulator — Z_T & Bandwidth
RF & Microwave
Quarter-wave impedance matching simulator computes Z_T=sqrt(Z_0*Z_L), the length l=lambda_g/4 and the matching bandwidth from source line, load and design frequency.
Radar Range Equation Simulator
RF & Microwave
Calculate the maximum range at which a monostatic radar can detect a target using the radar range equation.
RC/RL Circuit Transient Response Analyzer
Circuits
Analyze RC/RL circuit transient response instantly with our . Visualize voltage and current over time. No sign-up required.
Rectifier Ripple Voltage Simulator
Power Electronics
Calculate the residual "ripple voltage" left on a DC supply built from a diode bridge plus a smoothing capacitor.
Reflection Coefficient Simulator — Complex Gamma and Z_in Transform
RF & Microwave
Compute Gamma(d) along the line in real time from the load reflection coefficient and electrical distance d/lambda. Watch the phase rotation on the complex plane while V…
Electromagnetic Relay Pull-In Simulator
Design the operation of an electromagnetic relay — the electrically operated switch that lets a small control signal switch a large power circuit.
LCR Resonance Circuit Simulator — Impedance, Phase & Q-Factor Calculator
Circuits
Visualize impedance and phase frequency response for series and parallel LCR circuits in real time. Instantly compute resonant frequency, Q-factor, and bandwidth.
UHF RFID Link Budget & Backscatter Distance Simulator
Circuits
Size up the communication range of a passive UHF RFID (EPC Gen2) deployment from reader EIRP, tag sensitivity, polarization loss, and frequency band. Forward and backsca…
RLC Circuit Resonance Simulator — Impedance, Q Factor & Bandwidth
Circuits
Interactive RLC circuit resonance simulator. Visualize impedance, current vs. frequency, and phasor diagrams. Calculate resonant frequency, Q factor, and bandwidth.
Schmitt Trigger Simulator
Circuits
Design a non-inverting Schmitt trigger that uses positive feedback to obtain two switching thresholds (hysteresis).
PN Junction Diode I-V Characteristic Simulator — Shockley Equation
Circuits
Simulate PN diode I-V curves with the Shockley equation. Adjust material, ideality factor, and temperature to explore semiconductor physics.
Servo Motor Torque-Speed Curve Calculator
Power Electronics
Interactive calculator to plot servo motor torque-speed curves, power, and efficiency. Adjust key parameters with sliders for real-time analysis.
Shockley Diode Simulator — pn Junction I-V Characteristic
Circuits
Evaluate the Shockley diode equation I = I_S(exp(V/nV_T) - 1), the ideal current-voltage relation of a pn junction, in real time.
Short-Circuit Current Calculator (Symmetrical & Asymmetrical Faults)
Power Electronics
Calculate three-phase, SLG, LL, and DLG fault currents in real-time using the symmetrical component method. Includes transformer %Z and cable length.
Sigma-Delta ADC Oversampling Noise Shaping SNR Simulator
Circuits
Pick the OSR, modulator order and quantizer bits of a ΣΔ ADC and see the in-band SNR, ENOB, sampling frequency and power update in real time. See for yourself how a sing…
Skin Depth (Skin Effect) Calculator
RF & Microwave
Calculate skin depth for conductors with our . Input frequency, material properties, and get instant results for electrical engineering applications.
Skin Effect Simulator — AC Current Surface Concentration
RF & Microwave
Skin effect simulator: real-time skin depth delta and AC/DC resistance ratio for round conductors from frequency, conductivity, permeability and wire radius.
Smith Chart Simulator — Reflection Coefficient and VSWR
RF & Microwave
Plot a normalized load impedance z = Z_L/Z_0 on the Gamma plane as a single point. Build intuition for reflection coefficient and VSWR on a chart of constant-resistance …
Solenoid / Coil Design Calculator
Design and calculate solenoid coil parameters in real time. Set geometry, wire diameter, and core material to get inductance, field strength, resistance, and energy.
Stepper Motor Calculator
Power Electronics
Calculate stepper motor step angle, torque, speed curves & resonance frequency. Real-time visualization for engineers and designers.
Single-Stub Matching Simulator
RF & Microwave
A classic microwave-circuit design tool that matches a mismatched load to a transmission line with a single parallel stub. Change the load impedance and characteristic i…
Symmetrical Components Simulator — Positive/Negative/Zero Sequence Decomposition
Power Electronics
Decompose an unbalanced three-phase voltage set into three balanced symmetrical components using Fortescue's method. Slide V_a, V_b, V_c magnitudes and V_b phase to see …
Synchronous Machine Load Angle Simulator
Power Electronics
A tool to calculate how much power a round-rotor synchronous machine connected to the grid transfers through its rotor load angle δ.
NTC Thermistor Simulator — Resistance-Temperature Characteristic
Circuits
NTC thermistor simulator. Compute resistance, voltage-divider output and sensitivity from R0, B constant and temperature using the beta-parameter model in real time.
Thevenin Equivalent Simulator — Maximum Power Transfer
Circuits
A Thevenin source (V_th, R_th) feeds a wiring resistance R_w and a load R_L in series. Watch load current, voltage, power and efficiency update in real time and find the…
Third-Order Intercept Point (IP3) Simulator
RF & Microwave
Calculate the third-order intercept point (IP3), the figure of merit for the linearity of amplifiers and mixers.
Three-Phase Power Calculator — Active, Reactive & Apparent Power
Power Electronics
Enter line voltage, line current, and power factor to compute P, Q, S, and PF correction capacitance in real time. Includes phasor diagram and power triangle chart.
Thyristor Phase Control (Firing Angle) Simulator
Power Electronics
Explore phase control: delay the firing angle of a thyristor (SCR) to adjust the power delivered to a resistive load.
Total Harmonic Distortion (THD) Simulator
Circuits
Total harmonic distortion is the single number that measures how far an AC voltage or current waveform departs from a pure sine wave.
Transformer Design Calculator
Power Electronics
Compute transformer efficiency, leakage inductance, and peak flux density from turns ratio, core area, iron loss, and copper loss in real time. Build intuition for power…
Transformer Efficiency Simulator — Core Loss, Copper Loss & Optimal Load
Power Electronics
Simulate transformer efficiency in real time. Adjust turns ratio, capacity & load to compute core loss, copper loss, and find the optimal load point.
Transformer Voltage Regulation Simulator
Power Electronics
Work out the voltage regulation of a distribution transformer.
BJT Common-Emitter Amplifier Calculator — Operating Point, Gain & Load Line
Circuits
Calculate BJT common-emitter amplifier parameters: DC bias, voltage gain, and load line. Adjust VCC, resistors, and β in real-time.
BJT Transistor DC Bias Design
Circuits
Design BJT transistor DC bias circuits. Calculate Q-point, stability factor, and visualize the DC load line for voltage divider, emitter, and collector feedback bias.
Ferranti Effect Simulator
Power Electronics
Visualise the "Ferranti effect" that appears on long, lightly-loaded AC transmission lines.
Transmission Line · Reflection Coefficient · Impedance Matching Calculator
RF & Microwave
Calculate reflection coefficient, VSWR, return loss, and input impedance in real-time. Visualize results on a Smith chart and standing wave pattern.
PCB Via Inductance Simulator
RF & Microwave
A "via" that connects layer to layer in a printed circuit board carries a parasitic inductance that high-speed signals cannot ignore.
VSWR Simulator — Reflection Coefficient, Standing Wave Ratio and Return Loss
RF & Microwave
Visualize the reflection coefficient, VSWR, return loss and mismatch loss from line Z_0 and load Z_L. Feel how matching quality and reflected power respond to a complex …
Rectangular Waveguide Mode Calculator
RF & Microwave
Visualize TE/TM mode fields in rectangular waveguides. Instantly calculate cutoff frequency, guide wavelength, phase velocity, and group velocity.
Wheatstone Bridge Simulator — Balance Condition & Sensitivity
Circuits
Visualize the open-circuit output voltage Vout and balance condition of a bridge with four resistors R1 to R4 and excitation Vin. Experience the principle behind strain …
Wien Bridge Oscillator Simulator — Sinusoidal Oscillation Conditions
Circuits
Compute the Wien bridge oscillator frequency f0 = 1/(2*pi*R*C), the frequency-selective feedback ratio beta and the sustained oscillation condition A*beta = 1 in real ti…
Wilkinson Power Divider Simulator
RF & Microwave
Design the Wilkinson power divider that splits one RF/microwave signal into two (or combines two into one). Adjust the system impedance, operating frequency, substrate p…
Wireless Power Coupling Coefficient & Q-Factor Simulator
Power Electronics
Design a two-coil magnetic-resonance link (Kurs–Soljacic) as used in Qi phone charging and EV wireless power transfer.
Wireless Power Transfer Simulator
Power Electronics
Design a wireless power transfer (WPT) link that sends power across an air gap with no wires, using the magnetic field shared between two coils.
Y-Delta (Star-Delta) Transform Simulator
Circuits
Convert three resistors between the Y (star) and Δ (delta) arrangements using the Kennelly transform. Useful for three-phase power, Wheatstone-style bridges, ladder netw…
Zener Voltage Regulator Simulator
Circuits
Design the simplest of all voltage regulators — a shunt regulator built from just a series resistor and a zener diode.
How to Use
- Select circuit topology (series RLC, bridge rectifier, or coupled coil transformer) from the component library
- Input material properties: copper resistivity (1.68 µΩ·cm), core permeability (µr for ferrite or laminated steel), and operating frequency (50 Hz to 2.4 GHz)
- Define geometry: wire gauge (AWG), coil turns, gap distance in mm, and load impedance in ohms
- Run solver to compute magnetic field distribution, current density, loss density, and impedance
- Export S-parameters, field maps, or transient waveforms for validation
Worked Example
Three-phase transformer: 10 kVA, 480V primary, 120V secondary. Copper windings with resistivity 1.68 µΩ·cm, laminated steel core (µr=2000), 50 Hz operation. Simulator calculates core loss 85 W (using Steinmetz coefficients), copper loss 120 W at full load, leakage inductance 2.3 mH, and efficiency 98.6%. Adding 2 mm air gap increases magnetizing current from 1.2 A to 3.8 A and shifts resonance from 8.2 kHz to 6.1 kHz.
Practical Notes
- Mesh refinement critical near conductor edges: use <0.5 mm elements for skin-effect analysis in copper at 100 kHz (skin depth δ=0.65 mm)
- Ferrite cores saturate above 350 mT; monitor flux density to prevent nonlinear hysteresis artifacts in power electronics converters
- Motor winding simulations require phase angle input (typically 120° for three-phase); use 2D axisymmetric for cylindrical rotor geometry to reduce compute time by 60%
- RF circuits above 1 GHz: validate against measured S-parameters using magnitude and phase near transmission line discontinuities