Stereo FM Transmitter with BA1404


Posted on Feb 4, 2014

A high quality stereo FM transmitter circuit is shown here. The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator and RF amplifier. The FM modulator can be operated from 76 to 108MHz and power supply for the circuit can be anything between 1.25 to 3 volts. In the circuit R7, C16, C14 and R6, C15, C13 forms the pre-emphasis network for the right and left channels respectively. This is done for matching the frequency response of the FM transmitter with the FM receiver. Inductor L1 and capacitor C5 is used to set the oscillator frequency. Network C9,C10, R4,R5 improves the channel separation. 38kHz crystal X1 is connected between pins 5 and 6 of the IC. Composite stereo signal is created by the stereo modulator circuit using the 38kHz quartz controlled frequency


Stereo FM Transmitter with BA1404
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    PIC12C508A Beacon
    Removing the "DC Thump" from Audio Circuits
    RF Remote control
    Temperature-sensor
    Low-cost-half-duplex-information-transmission-link
    bicycle back safety light
    Automatic Windshield Washer Control
    PIC Projects
    A LOW-BATTERY ALARM FOR 13.6 VOLT LEAD-ACID BATTERIES



    Top