Electronics Project (Znidarsic Science Books)

Hands free automotive cell phone calling is a hot topic right now. This book presents a project that shows how to build a wired automotive hands free cell phone adapter. The device requires an automobile equipped auxiliary input radio jack and a cell phone equipped with a round 2.5 mm or 3.5 mm earphone jack. No power supply or other connection to the automobile, other than plugging into the aux radio jack, is needed. The cell phone’s output will be presented over the car’s radio. The project requires the ability to use hand tools, to solder, and to read a meter. The 50 page text provides details on the physics of both active and passive echo reduction. The methods and parts of the project were used to provide a brief overview on the history of technology, mathematics, physics, and electronics. It was designed to be fun and to uses the experience to learn about science and technology. It is worth reading without building the project.