Falstad Circuit Simulator

Simulation Settings

Analysis Precision: Good

Numerical Method:

Analysis Type

Simulation Speed: 5x Voltage Source: V

Component Palette

Resistor

100Ω - 1MΩ

Capacitor

1pF - 100μF

Inductor

1μH - 1H

Diode

1N4148, 1N4007

Voltage Source

DC/AC source

Current Source

DC/AC source

Ground

0V reference

Transistor

BJT, MOSFET

Quick Examples: Click on any circuit below to load it into the simulator

Waveform Visualization

Display Signals

Measurement Tools

Advanced Circuit Analysis

Node Voltage Analysis

Matrix Analysis

Conductance Matrix Size:

2×2

Matrix Condition Number:

1.23

Numerical Stability:

Excellent

Solution Method:

LU Decomposition

Circuit Topology Analysis

Circuit Complexity:

Simple series circuit Low Complexity

Number of Nodes:

Number of Components:

SPICE Netlist

SPICE (Simulation Program with Integrated Circuit Emphasis) is the industry standard for circuit simulation. Below is the netlist generated from your circuit.

* Circuit Simulator Netlist
* Generated by GetZenQuery Advanced Circuit Simulator
* Date: 2023-12-01

V1 1 0 DC 12
R1 1 2 1000
C1 2 0 1u

.OP
.END

SPICE Analysis Commands

Component Parameters

Select a component to edit its parameters

Quick Measurements

Selected Node Voltage

0.00 V

Selected Branch Current

0.00 mA

Power Dissipation

0.00 mW

Simulation Statistics

Circuit Nodes

Components

Simulation Time

0.12 ms

Iterations

Convergence

Achieved

Matrix Size

2×2

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About Circuit Simulation

Circuit simulation allows engineers and students to design and analyze electronic circuits without physically building them. This simulator uses numerical methods to solve circuit equations and predict circuit behavior.

Simulation Engine: This simulator uses a modified nodal analysis (MNA) approach to solve circuit equations. It supports both transient (time-domain) and AC (frequency-domain) analysis.

The simulation engine is based on the open-source Falstad Circuit Simulator, which uses JavaScript to perform real-time circuit analysis in your browser.

How to Use the Simulator

Add Components: Click on components in the palette to add them to the circuit canvas. Drag components to position them.

Connect Components: Click on component terminals to draw wires between them. Use the "Add Wire" tool for manual wiring.

Set Parameters: Double-click on components to edit their values (resistance, capacitance, voltage, etc.).

Run Simulation: Click the "Run Simulation" button to analyze the circuit. View results in the analysis panel.

Analyze Results: Examine voltage, current, and power values. Use oscilloscope views for time-domain analysis.

Circuit Analysis Methods

Analysis Type	Description	Typical Use
DC Analysis	Solves for steady-state voltages and currents	Bias point calculation, operating point analysis
Transient Analysis	Simulates circuit behavior over time	Switching circuits, time-domain response
AC Analysis	Frequency response analysis	Filter design, frequency response
Transfer Function	Calculates input-output relationship	Control systems, amplifier design
Noise Analysis	Models circuit noise sources	Low-noise amplifier design

Supported Components

Resistors: Fixed and variable resistors
Capacitors: Ceramic, electrolytic, variable
Inductors: Air-core, iron-core, transformers
Diodes: Standard, Zener, LED, Schottky
Transistors: BJT, MOSFET, JFET

Voltage Sources: DC, AC, pulse, sinusoidal
Current Sources: DC and AC current sources
Operational Amplifiers: Ideal and real models
Logic Gates: Basic digital gates
Measurement Tools: Voltmeters, ammeters, oscilloscopes

Applications of Circuit Simulation

Education: Learning electronics without physical components
Prototyping: Testing circuit designs before fabrication
Troubleshooting: Diagnosing problems in existing circuits
Optimization: Finding optimal component values
Research: Exploring novel circuit topologies

Note: While circuit simulation is a powerful tool, it has limitations. Simulations use mathematical models that may not perfectly match real-world component behavior, especially at high frequencies or with non-linear components. Always verify critical designs with physical prototypes.

Frequently Asked Questions

DC analysis finds the steady-state operating point of a circuit (constant voltages and currents). Transient analysis shows how the circuit behaves over time, which is useful for switching circuits or time-varying signals. AC analysis shows the circuit's frequency response, which is essential for filter design and amplifier frequency characteristics.

The accuracy depends on the component models used. Simple simulations use ideal component models, which work well for basic analysis but may not capture all real-world effects like parasitic capacitance, component tolerances, or temperature dependence. For more accurate simulations, you can use more detailed component models that include these effects.

Yes, this simulator supports mixed-signal simulation, allowing you to combine analog components (resistors, capacitors, transistors) with digital components (logic gates, flip-flops). This is useful for designing circuits that interface analog sensors with digital microcontrollers or for simulating the analog behavior of digital circuits.

You can export circuits in SPICE netlist format, which is a standard format for circuit simulation that can be imported into other simulation tools like LTspice or ngspice. You can also save circuits as JSON files for later use in this simulator. Some common formats like .cir or .net files can be imported.

You can add voltmeters and ammeters from the component palette. Place a voltmeter in parallel with the component or node you want to measure. Place an ammeter in series with the component whose current you want to measure. You can also use the probe tool to click on any node or component to see its voltage or current.