The speed of an automobile can be indicated by detecting the pulses generated by the ignition system and causing an LED to light. The circuit utilizes a quad NOR gate IC chip. Two of the gates are ...

If you’re working with 3.3V or 5V circuits, it’s easy for you to throw on a power or status LED here or there. [Tom Gralewicz] has found himself in a pickle, though, often working on projects with ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. SPRINGFIELD, Ill. (AP) _ Illinois plans to ...