Free Circuit Analysis Tool Online — Analyze Schematics in Your Browser

Analyze Your Circuits Without Installing Any Software

Understanding a circuit design usually requires manual calculation or expensive simulation software like SPICE. MakerSuite 3D now includes a browser-based circuit analysis tool that automatically detects common circuit patterns in your KiCad schematic and calculates key electrical parameters. No installation, no signup, no file uploads to any server.

What Is a Circuit Analysis Tool?

A circuit analysis tool examines the netlist and component values in your schematic to identify common circuit topologies and compute their electrical characteristics. Instead of manually tracing nets and plugging values into formulas, the analyzer does it automatically. It detects voltage dividers and computes output voltages, identifies RC and LC filter networks and calculates cutoff frequencies, finds series and parallel resistor combinations and computes equivalent resistance, calculates power dissipation for resistors, and determines the correct current-limiting resistor for LEDs.

Circuit Analysis Features

• Voltage Divider Detection — Automatically identifies resistor voltage divider networks and calculates the output voltage ratio for any input voltage
• RC/LC Filter Analysis — Detects resistor-capacitor and inductor-capacitor filter networks, calculates cutoff frequency, and identifies low-pass, high-pass, and band-pass configurations
• Series/Parallel Combination — Finds resistors connected in series or parallel and computes the equivalent resistance, simplifying complex networks
• Power Dissipation Calculation — Calculates the power dissipated by each resistor based on the voltage across it and current through it, helping you select appropriate wattage ratings
• LED Current Calculation — Identifies LED circuits with current-limiting resistors and computes the forward current based on supply voltage, forward voltage drop, and resistor value

How to Analyze a Circuit Online

1. Open pcbviewer.app — Open pcbviewer.app in your browser
2. Drag and drop your .kicad_sch schematic file onto the drop zone
3. The schematic renders on the canvas and the circuit analyzer runs automatically
4. View detected circuit patterns in the analysis panel — voltage dividers, filters, and component combinations
5. Click any detected pattern to highlight the relevant components and nets on the schematic

Example Analysis Results

• A 10k/4.7k voltage divider on a 5V rail shows an output of 1.60V — useful for level shifting between 5V and 3.3V logic
• A 10k resistor with a 100nF capacitor forms a low-pass RC filter with a cutoff frequency of 159.15 Hz
• Three 1k resistors in parallel yield an equivalent resistance of 333.3 ohms
• An LED with a 330-ohm current-limiting resistor on a 3.3V supply draws approximately 5.6 mA (assuming 1.8V forward voltage)

Who Needs a Circuit Analysis Tool?

• Hardware engineers verifying voltage levels and filter characteristics before prototyping
• Students learning circuit theory who want to check their manual calculations against automated analysis
• Makers building Arduino and Raspberry Pi projects who need to calculate LED resistor values or voltage dividers
• Design reviewers checking power dissipation and thermal limits across all resistors in a design
• Hobbyists exploring open-source hardware projects and understanding how the circuits work

Privacy and Security

The circuit analysis tool processes everything locally in your browser. Your schematic files are never uploaded to any server. Component values and netlist data stay on your device, making it safe for proprietary and confidential designs.