No one tells you what those different beeps or on-off lights on your smoke detector mean. Here's what you need to know.

This is a flashing led lights circuit powered from a 12V DC power supply that uses the well known 555 IC. Flashing lights have many and varied applications in life. They are used as warning lights on ...

This is an archived article and the information in the article may be outdated.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. SAN DIEGO — Heading into Labor Day weekend, ...