Here is some interesting electronics stuff. Have u ever wondered how a valve works? "No" i hear u say :)... well its all here :)...

Vacuum Tubes - Describes the operation of electronic vacuum tubes and why they may sound better

Microwave Engineering - Some selected topics in electrical engineering at high frequencies.

Device Modelling - Modelling solid state devices

LCR circuit - Analysis of an inductor, capacitor and resistor circuit

Skin Effect - Derivation of the skin effect from Maxwell's equations

Square wave spectrum - Derivation of the spectrum of a square wave