![]() A stereo broadcast signal features a pair of channels: left and right. Most of the basic wireless FM transmitters tend to be monophonic only. The FM stereo transmitter circuit described below can be used for broadcasting a much clearer stereo FM music to all nearby FM radios. Work with an 80 cm copper cable as antenna.įor L1 try to make three turns of 0.5mm dia enamelled copper wire on a 5mm dia ferrite core. Operating the circuit from a battery pack minimizes disturbances. Composite stereo reception is formed by the stereo modulator circuit employing the 38kHz quartz regulated frequency.Ĭonstruct the circuit on a high quality PCB. Group C9,C10, R4,R5 enhances the station splitting up.ģ8kHz crystal X1 is linked between pins 5 and 6 of the IC. Inductor L1 and capacitor C5 is employed to fix the oscillator frequency. This is achieved for complementing the frequency response of the FM transmitter with the FM receiver. In the circuit R7, C16, C14 and R6, C15, C13 makes the pre-emphasis system for the right and left stations respectively. The FM modulator could be controlled from 76 to 108MHz and power source for the circuit could be nearly anything between one.25 to three volts. The circuit relies upon the IC BA1404 from ROHM Semiconductors.īA1404 is a monolithic FM stereo modulator which includes integrated stereo modulator, FM modulator, RF amplifier circuitry. An exceptional stereo audio FM wireless transmitter circuit is presented below. ![]()
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