Multifunctional FM stereo transmitter module/microphone wireless transmitter/wireless microphone module I. Product features: _x000D_ _x000D_ 1: The use of advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation technology (PLL) to make the sound quality more realistic, more stable performance, long time working frequency without offset. _x000D_ _x000D_ 2: LCD display is more intuitive and accurate, with very low power consumption and minimal noise interference. _x000D_ _x000D_ 3: built-in level 30 digital volume adjustment, button operation can be easily completed. _x000D_ _x000D_ 4: Automatic memory of data before power failure _x000D_ _x000D_ 5: multi-channel audio input automatic switch _x000D_ _x000D_ 6: quartz crystal frequency stabilization, temperature change emission frequency no longer drift _x000D_ _x000D_ 7: Support serial command control _x000D_ _x000D_ _x000D_ _x000D_ Ii. Product parameters: _x000D_ _x000D_ Output power: 100mW _x000D_ _x000D_ Frequency range: 50HZ-18khz _x000D_ _x000D_ Transmission frequency: _x000D_ _x000D_ Turn off campus radio 87.0mhz to 108.0mhz, and turn on campus radio 76.0mhz to 108.0mhz _x000D_ _x000D_ _x000D_ _x000D_ Frequency adjustment step: 0.1mhz/time (button short press), 1.0mhz/time (button long press) _x000D_ _x000D_ Modulation mode: standard FM _x000D_ _x000D_ Sound channel: LINE/USB channel (stereo), MIC channel (mono) _x000D_ _x000D_ Equivalent noise: 30dB (sound quality close to CD sound quality) _x000D_ _x000D_ Supply voltage: DC 3.0V-5.0V _x000D_ _x000D_ Operating current :35mA _x000D_ _x000D_ Transmitting antenna :75cm pull rod antenna _x000D_ _x000D_ Transmission distance: FM transmitting module is connected with 75cm standard pull rod antenna, desheng PL-660 is used for radio, and the measured coverage radius is 100 meters in an open area. (Note: the launch distance is only for reference, slightly different due to different use environment) _x000D_ _x000D_ _x000D_ _x000D_ Iii. Instructions: _x000D_ _x000D_ _x000D_ _x000D_ < 1 > : power supply _x000D_ _x000D_ The corresponding ports on the module are -, + respectively connected to the negative and positive terminals of the power supply (battery). It is recommended to use batteries or other stabilized power supplies. Do not use the switching power supply without filter (such as mobile phone charger, and other inferior switching power supply), otherwise the interference generated by the power supply will affect the normal operation of the module. The normal working voltage of this module is 3.0-5.0V, and the supply voltage should not exceed this range. _x000D_ _x000D_ _x000D_ _x000D_ < 2 > : buttons _x000D_ _x000D_ Volume +/- : Press volume +/ -1, and hold down volume +/- continuously _x000D_ _x000D_ Frequency +/- : Short press +/ -0.1mhz, long press continuously +/ -1mhz _x000D_ _x000D_ Mute: Press to switch to mute/Unmute _x000D_ _x000D_ _x000D_ _x000D_ < 3 > : antenna _x000D_ _x000D_ ANT port is used to connect FM antenna. In order to better transmit FM signals, it is recommended to connect 75cm long pull rod antenna externally, and there should be no obstacles near the antenna as far as possible. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ : USB audio connection _x000D_ _x000D_ If you need the USB audio broadcast function of this module, you also need to connect the USB cable to the computer. USB port is compatible with ordinary mobile phones, so you can use the mobile phone USB cable to connect the module and the computer. Since the COMPUTER USB has 5V output, the USB port can be directly used to supply power for the module when connecting the computer with USB. After connecting the COMPUTER USB, the module will automatically enter the PC audio broadcast mode, the LCD screen will display PC, the computer will automatically install the driver, and the module named "CD002" sound card device, enable and enable the audio device "CD002" in the computer sound Settings. The computer system audio can be transmitted in FM mode through this module, and the computer side system audio transmitted by this module can be heard when the nearby radio frequency is adjusted to the same frequency. _x000D_ _x000D_ _x000D_ _x000D_ : LINE audio connection _x000D_ _x000D_ If you need the LINE (LINE input) channel of this module as the audio source for transmitting, just plug one end of the audio cable into the 3.5mm audio