PC Board Design Resources

Trace-Width Calculations

• CircuitCalculator.com
• PCB Track Width Calculator

Other Engineering Calculators

• Microstrip Impedance Calculator
• Chemandy Calculators

Screw Hole Size Guide

• Wikipedia Drill and Tap Size Chart
• Gauge Calculator

Resistor Color Codes

IC Logos

• IC Logo Finder

Component Identification

• Part Number Decoder

PCB Libraries

• PCB Libraries
• SnapEDA

PCB Laminates

• Global Sources
• Park Electrochemical Corp
• Rogers Corporation

Dialectric Materials

• Dielectric Constants Table

Differential Pair Calculator

• Saturn PCB Design
• Mantaro Impedance Calculators
• Polar Instruments

SMD Markings / Codes

• Embedeo SMD marking codes
• KyteLabs SMD Code Index

IPC

• IPC -- Association Connecting Electronics Industries
  

Patent Lawyers

• Lynch LLP, Intellectual Property and Business Law