Using BA1404 can be designed a very simple and useful fm stereo modulator electronic project. This BA1404 fm stereo modulator device works in FM broadcast band ( 75- 108MHz) and require few external common components. The BA1404 fm stereo modulator Ic contains all parts needed to design an simple high efficiency stereo transmitter circuit. This
IC contains a stereo modulator that creates stereo composites signals, an FM modulator that creates FM signals and a RF amplifier. The fm stereo transmitter develops composite signals made up of a main(L+R) signal and sub(L-R) signal and a pilot (19KHz) signal using a 38KHz crystal oscillators.