Electromagnetics and Circuit Simulators

AC Circuit Impedance Simulator — RLC Series/Parallel, Resonance & Bode Plot

Circuits

AC Circuit Impedance Simulator: Calculate impedance, resonance, Q-factor and phase angle for RLC circuits with real-time Bode plot visualization.

Series RLC Circuit Simulator — AC Impedance and Resonance

Circuits

Series RLC circuit simulator for AC impedance, resonance frequency, and Q factor analysis with frequency sweep visualization.

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

ADC jitter SNR simulator showing waveform sampling, SNR curves, and error analysis. Learn jitter effects on signal integrity at high frequencies.

Ampere Law Simulator — Magnetic Field of Straight Currents and Solenoids

Electromagnetics Fundamentals

Ampere law simulator: real-time magnetic field of an infinite straight wire B = mu0*I/(2*pi*r), uniform solenoid interior B = mu0*n*I, and force per length between parallel wires.

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

Calculate resonant length, radiation resistance, gain, VSWR & path loss for dipole, monopole, loop & patch antennas. Free online tool.

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

Visualize the frequency response of a series RLC band-pass filter. Compute resonant frequency, Q-factor, -3 dB bandwidth, gain and phase at any probe frequency.

Biosensor EIS (Electrochemical Impedance Spectroscopy) Simulator

Circuits

Biosensor EIS (Electrochemical Impedance Spectroscopy) Simulator: Compute the Randles equivalent circuit response for a label-free biosensor and watch the Ny…

Biot-Savart Law Simulator — Magnetic Field of a Circular Current Loop

Electromagnetics Fundamentals

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

Estimate ideal output voltage, inductor ripple, and switch stress for a boost converter from input voltage, duty, inductance, frequency, and load.

Branch-Line Coupler Simulator

RF & Microwave

Branch-Line Coupler Simulator: Design the 3-dB branch-line coupler (quadrature hybrid) that splits one RF signal into two outputs of equal amplitude and a 90…

Buck Converter Ripple Simulator

Power Electronics

Estimate buck-converter output voltage, inductor ripple, and output voltage ripple from input voltage, duty, L, C, frequency, and load current.

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.

Capacitor Charge/Discharge & Energy Simulator

Circuits

Simulate RC circuit charging and discharging in real time. View plots for voltage, current, and energy. Calculate time constant τ, max energy, and charge.

Charged Particle in Electromagnetic Field Simulator

Electromagnetics Fundamentals

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

Interactive 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

Coaxial cable impedance calculator: compute Z_0, velocity factor and per-unit-length C/L from inner radius a, outer inner radius b, and dielectric constant ε_r in real time.

Coil Inductance Calculator (Nagaoka Coefficient & Wheeler Formula)

Magnetics & Applications

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

Coplanar waveguide simulator calculating characteristic impedance Z₀ using Wheeler/Hilberg approximation. Adjust width, gap, and dielectric for 50-ohm RF impedance matching.

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

Electromagnetics Fundamentals

Coulomb Law Simulator for electric force calculation between point charges. Real-time F=kq₁q₂/r² solver with field lines, potential energy, and force graphs.

Coulomb Force Visualizer

Electromagnetics Fundamentals

Coulomb Force Visualizer: Interactive tool to compute electrostatic force between charges. Adjust charge magnitudes and separation distance in real-time simulations.

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

Compute differential Z_diff, odd-mode and even-mode of an edge-coupled microstrip pair from trace width, spacing, height and Dk — for USB 90 ohm and HDMI 100 ohm PCB design.

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

Magnetics & Applications

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

Analyze series and parallel DC circuits with configurable voltage and resistor values. Learn circuit laws and practical engineering applications.

Electric Field & Potential Simulator — Point Charge Superposition

Electromagnetics Fundamentals

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

Electric Motor Torque & Speed Calculator: Set the supply voltage, armature resistance, torque/back-EMF constants and operating current to compute torque, spe…

Electric Field & Potential Visualizer — Equipotential Lines & Field Lines

Electromagnetics Fundamentals

Electric Potential Field Simulator: Visualize the potential distribution from multiple point charges on a red-blue color map. Draw equipotential lines and el…

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.

Power Factor Correction — Capacitor Sizing Calculator

Power Electronics

Calculate capacitor size (kVAR/μF) instantly. Enter active power, current & target PF to find required capacitance and see potential current & energy savings.

Electrical Grounding Resistance Calculator (IEEE 80 / Wenner)

Circuits

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

Magnetics & Applications

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

Electromagnetics Fundamentals

Set coil parameters and magnetic field for real-time visualization of magnetic flux Φ, induced EMF ε, and induced current I.

Electromagnetic Shielding Effectiveness Calculator — Skin Depth, SE (dB)

RF & Microwave

Calculate EMI shielding effectiveness for copper, aluminum, steel and mu-metal. Computes skin depth, absorption A, reflection R and total SE in dB.

Electromagnetic Wave Simulator — E & B Field Visualization

Electromagnetics Fundamentals

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

Electromagnetics Fundamentals

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.

Gauss's Law Electric Field Simulator

Electromagnetics Fundamentals

Calculate and visualize electric fields for infinite line charge, infinite plane, and spherical charge distributions using Gauss's law.

Hall Effect Simulator — Charge Carrier Density Measurement

Electromagnetics Fundamentals

Hall effect simulator: real-time Hall voltage, Hall coefficient and electric field from current, magnetic field, carrier density and thickness for semiconductor characterization.

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

High-Voltage Lightning Arrester Rating Simulator: Design ZnO/MOV surge arresters for transmission systems per IEC 60099. Sweep system voltage, neutral ground…

Hysteresis Loss & Magnetic Circuit Designer

Magnetics & Applications

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 RL circuit transient response in real time. See current, voltage, and energy for energizing, de-energizing, and AC modes. Automatically calculates time constant τ.

Kirchhoff Laws Simulator — Series-Parallel Resistor Circuit

Circuits

Kirchhoff Laws Simulator for series-parallel resistor circuits. Visualize KVL, KCL, current division, and voltage drops in real time for circuit analysis.

LC Circuit Oscillation Simulator — RLC Damped Oscillation

Circuits

Simulate RLC circuit behavior. Adjust L, C, R values to instantly visualize damped voltage waveforms, impedance resonance curves, and key parameters like resonant frequency.

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

Circuits

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

Visualize the frequency response of a first-order RC low-pass filter. Adjust R and C to inspect cutoff, gain, phase and time constant on a live Bode plot.

Magnetic Levitation Simulator (PID Control) — Earnshaw's Theorem

Magnetics & Applications

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

Magnetics & Applications

Neodymium Magnet Flux & Force Air Gap Simulator: Design magnetic circuits using neodymium (N42/N52/N35SH) or ferrite magnets. Adjust magnet size, air gap, te…

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

Electromagnetics Fundamentals

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

Electromagnetics Fundamentals

Real-time calculation of internal, external, and axial magnetic fields for solenoid coils. Visualize field distribution using Ampère's Law and Biot-Savart Law. Useful for electromagnet, MRI, and motor design.

Magnetic Field Lines Simulator — Electromagnetic Visualization

Electromagnetics Fundamentals

Visualize magnetic field lines from current-carrying wires and bar magnets in real time. Explore Ampere's Law and dipole field interactions interactively.'s Law and dipole fields. Interactive physics tool.

Lorentz Force & Charged Particle Motion Simulator

Electromagnetics Fundamentals

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

Magnetics & Applications

Simulate magnetic hysteresis loops in real time with the Jiles-Atherton model. Compute key parameters like coercivity, remanence, and energy loss for various materials.

Electromagnetic Induction Simulator

Electromagnetics Fundamentals

Explore electromagnetic induction with an interactive simulator. Adjust coil turns, area, flux, and frequency to visualize the phase shift between B(t) and induced EMF.

Magnetic Levitation Stability Simulator — PID Control & Step Response

Magnetics & Applications

Simulate PID control of an electromagnetic levitation system. Tune coil, gap, mass and PID gains to analyze closed-loop step response and stability margins.

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

Magnetics & Applications

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

Electromagnetics Fundamentals

Mass spectrometer simulator for magnetic-sector ion separation: compute ion trajectories, radius, and m/z ratios from acceleration voltage and magnetic field.

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

Calculate microstrip transmission line impedance, loss, and wavelength. Real-time Z0 analysis and synthesis for RF circuit design.

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

Motor Starting Current Simulator: Calculate the large starting current (inrush current) that flows the instant a three-phase induction motor is connected to …

555 Timer Astable Simulator

Circuits

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 th…

Cascade Noise Figure (Friis) Simulator

RF & Microwave

Cascade Noise Figure (Friis) Simulator: Compute the total noise figure of a 3-stage RF receiver chain in real time with the Friis formula. Change the gain an…

OFDM Subcarrier Simulator

RF & Microwave

Explore the physical layer of OFDM (orthogonal frequency-division multiplexing), the modulation shared by WiFi, 4G LTE and 5G.

Ohm's Law & DC Circuit Simulator — Voltage, Current, Resistance

Circuits

Slide V, I, R sliders and watch current flow animate in real time. Switch to circuit mode to analyze series, parallel, and mixed resistor networks instantly.

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.

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

Phased Array Antenna Beam Steering Simulator: Steer an N-element phased array electronically — without any mechanical motion — by tweaking the per-element ph…

Piezoelectric Transducer Coupling Coefficient (k) Simulator

Circuits

Piezoelectric Transducer Coupling Coefficient (k) Simulator: Compute the electromechanical coupling coefficient k of a piezoelectric ceramic (PZT and similar…

Piezoelectric Calculator

Circuits

Calculate piezoelectric sensor & actuator parameters: d33/d31 coefficients, charge sensitivity, resonance frequency, and coupling factor k33. Use material presets for fast results.

Power Cable Ampacity Simulator

Power Electronics

Power Cable Ampacity Simulator: Design the ampacity — the maximum continuous current a power cable can carry. Change the conductor material, cross-section, i…'t overheat the insulation.

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

Calculate inductor, capacitor, duty cycle, and efficiency for Buck, Boost, and Buck-Boost DC-DC converters. Real-time inductor current waveform and efficiency curve visualization.

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 free online calculator. 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 the complex reflection coefficient Gamma from load and characteristic impedance, and visualize its phase rotation along the line with VSWR and input impedance in real time.

Electromagnetic Relay Pull-In Simulator

Magnetics & Applications

Electromagnetic Relay Pull-In Simulator: Design the operation of an electromagnetic relay — the electrically operated switch that lets a small control signal…

LCR Resonance Circuit Simulator — Impedance, Phase & Q-Factor Calculator

Circuits

Visualize real-time impedance and phase response for series/parallel LCR circuits. Instantly compute resonant frequency, Q-factor, and bandwidth with this interactive simulator.

UHF RFID Link Budget & Backscatter Distance Simulator

Circuits

UHF RFID Link Budget & Backscatter Distance Simulator: Size up the communication range of a passive UHF RFID (EPC Gen2) deployment from reader EIRP, tag sens…

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

Shockley diode simulator: real-time I = I_S(exp(V/nV_T)-1) for pn junction. Thermal voltage, dynamic resistance, power, and semi-log I-V curve with temperature comparison.

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.

Skin Depth (Skin Effect) Calculator

RF & Microwave

Calculate skin depth for conductors with our free online tool. 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

Smith Chart Simulator for reflection coefficient and VSWR analysis—visualize normalized impedance, Gamma plane plotting, and transmission line matching.

Solenoid / Coil Design Calculator

Magnetics & Applications

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.

Symmetrical Components Simulator — Positive/Negative/Zero Sequence Decomposition

Power Electronics

Decompose unbalanced three-phase voltages using Fortescue's method. Interactive simulator for positive, negative, zero sequence analysis and voltage unbalance calculations.

Synchronous Machine Load Angle Simulator

Power Electronics

Synchronous Machine Load Angle Simulator: A tool to calculate how much power a round-rotor synchronous machine connected to the grid transfers through its ro…

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

Thevenin Equivalent Simulator for maximum power transfer analysis. Simulate load current, voltage, power and efficiency with real-time updates. Thevenin equivalent, impedance matching.

Third-Order Intercept Point (IP3) Simulator

RF & Microwave

Third-Order Intercept Point (IP3) Simulator: 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

Calculate three-phase power (P, Q, S) and PF correction capacitance instantly. Enter voltage, current, and power factor. View live results, phasor diagram, and power triangle.

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 (THD) Simulator: Total harmonic distortion is the single number that measures how far an AC voltage or current waveform departs fro…

Transformer Design Calculator

Power Electronics

Design transformers with precision using our free online calculator. Optimize core, windings, and efficiency for your electrical projects.

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

Ferranti Effect Simulator: Visualise the "Ferranti effect" that appears on long, lightly-loaded AC transmission lines. Adjust the line length, sending-end vo…

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

PCB Via Inductance Simulator: A "via" that connects layer to layer in a printed circuit board carries a parasitic inductance that high-speed signals cannot i…

VSWR Simulator — Reflection Coefficient, Standing Wave Ratio and Return Loss

RF & Microwave

The VSWR simulator computes the reflection coefficient, standing wave ratio, return loss and mismatch loss in real time from the line impedance Z_0 and a complex load Z_L.

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

Wheatstone Bridge Simulator for strain gauges and precision resistance measurement. Explore balance conditions, output voltage, and sensor sensitivity with interactive visualization.

Wien Bridge Oscillator Simulator — Sinusoidal Oscillation Conditions

Circuits

Wien Bridge Oscillator Simulator: Compute f0, feedback ratio, and sustained oscillation conditions (A*beta=1) for sinusoidal generation. Wien bridge, oscillator design.

Wilkinson Power Divider Simulator

RF & Microwave

Design the Wilkinson power divider that splits one RF/microwave signal into two (or combines two into one).

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.

Zener Voltage Regulator Simulator

Circuits

Zener Voltage Regulator Simulator: Design the simplest of all voltage regulators — a shunt regulator built from just a series resistor and a zener diode. Adj…