Get up to speed fast with the terms and definitions you need.
Learn the secret that allows you to relate current and voltage in a resistive circuit element.
Who says resistance is futile? Find the perfect current limiting resistor for your series LED with this calculator.
interfacing with optoisolators
Optoisolators or optocouplers should be high on your list of favorite circuits if you interface custom circuits to a PC motherboard.
a cheap, current-regulated Luxeon Star driver design
After almost a year with no new circuit articles, here's a great cheap way to safely drive your Luxeon Star LEDs.
Why do I need a resistor with an LED?
The current-voltage releationship in LEDs is complex, but this article will help you understand the practical need for a current limiting resistor.