Looking into your rearview mirror and seeing the flashing lights of a police car behind you is likely one of the last things you want to see as a driver. After all, most of us associate those flashing ...

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This is an archived article and the information in the article may be outdated.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 ...