This is the stereo FM transmitter schematic diagram which built based BA1404. By using this HI-FI stereo FM transmitter, you will be able to transmit MP3 music from your iPod, computer, discman, walkman, TV / SAT receiver, and many other audio sources.
The transmitter can work from a single 1.5V cell battery and provide excellent crystal clear stereo sound. It can also be supplied from two 1.5V battery cells to provide the maximum range.
The kits of Stereo FM Transmitter 88-108 MHz based BA1404 available at electronics-diy.com, check it out