Reference Hub

Topic-based access to the most practical engineering checks

This page groups the English tool set by engineering task so you can move faster between related checks instead of hunting through the full navigation.

Scope

The English section focuses on the highest-value reference pages. Broader long-form content remains centered on the Chinese site.

Copper Bar and Ampacity

Copper Bar and Ampacity

Best for copper bar sizing, resistance, cost checks, and current-capacity estimates.

Copper Bar Current Capacity

Thermal-balance ampacity and loss estimation.

Copper Bar Resistance

Resistance, power loss, and voltage drop for copper bars.

Copper Bar Price Calculator

Estimate cost before quotation and procurement.

Metal Weight Calculator

Convert dimensions into copper, brass, or aluminum weight.
PCB Signal and Safety

PCB Signal and Safety

Use for high-voltage spacing, power trace voltage drop, and high-frequency conductor-loss checks.

PCB Spacing Calculator

Estimate clearance from IPC-2221 and IPC-9592 guidance.

Trace Voltage Drop

Estimate resistance, drop, power loss, and temperature rise.

Skin Depth Calculator

Understand frequency-dependent conductor loss.

PCB Impedance Calculator

Microstrip and stripline impedance calculations.
General Electrical Tools

General Electrical Tools

Supporting tools for conversions, resistor decoding, and quick electrical estimation.

Length Converter

Convert mil, inch, mm, and other common units.

Rated Current Calculator

Transformers, motors, and capacitor bank current estimation.

Resistor Color Code

Decode and reverse-check resistor band values.

Voltage Divider Calculator

Solve node voltage and resistor dissipation quickly.

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Open the Chinese homepage for the broader article library and topic clusters.