A device that adapts an MP3 player or other portable audio source to a car's audio system via the FM radio. It retransmits the analog output of the headset jack as one of several FM channels ...

Generic MP3 car adapters work with all ... easy ways to attach a player by pretending to be a radio station and a tape cassette. The FM transmitter, also called an "FM modulator," transmits ...

and while that might have gone by the wayside as AM radio has declined and point-contact diodes become a rarity it’s still common to make an FM transmitter from a transistor or two or even a ...