Electronics
Wikipedia introduction to electronics theory and devices, to circuits, electronic noise, testing and design.

How Stuff Works: Electronics
Covers all types of electronic products, including cell phones, digital cameras, GPS, WiFi, etc.

Introduction to Electricity
Basic introduction for high school students covers the history and discovery of electricity, the basic structure of matter, the measurement of electricity, conductors, circuits, AC and DC current, and more. This site was produced with funding from the National Science Foundation.

Sci.Electronics.Repair FAQ
Large collection of repair information for consumers and electronics hobbyists. Includes troubleshooting tips and sources for parts and equipment.

VCR Repair Instruction
Model-specific online manuals.