This is a circuit that will broadcast CD quality sound to your FM Walkman; home stereo or automobile radio. It produces a strong signal that will generally cover the average home and yard. It is stable enough to use even with digitally tuned FM receivers. Typical uses include broadcasting your own music to a receiver at pool-side or in the garden. Or; you could broadcast from a personal; portable CD player to a car radio that has no CD player. School uses include running a "broadcast station" from another room as a speech class exercise. The unit is powered by a 9V transistor battery; or you could use an AC wall adaptor.