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FM FM Stereo Audio Transmitter Module FM Mini Digital FM Radio -70875
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FM FM Stereo Audio Transmitter Module FM Mini Digital FM Radio -70875
FM FM Stereo Audio Transmitter Module FM Mini Digital FM Radio -70875

FM FM Stereo Audio Transmitter Module FM Mini Digital FM Radio -70875

DSP PLL Digital FM Transmitter Module Stereo Microphone 87-108MHz DSP PLL Digitl Stereo FM Rdio Trnsmitter Module 87-108MHz With Seril Control Frequency Rnge 50Hz-18KHz Wireless Microphone
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    Product Detail

    product detail


    LCD Edition FM Radio Digital Transmitter Module

    Product feature:
      1. Using advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) technology to make the sound quality more realistic, more stable performance, long-term operating frequency without offset.
      2. LCD display is more intuitive and accurate, with very low power consumption and minimal noise interference.
      3. With automatic search station and storage station function, easy to operate.
      4. Built-in 16-level digital volume adjustment, easy to complete by button operation.
      5. Power-down automatic memory data before power-off.
      6. Support serial AT command control.
      7. The chip-type high-precision quartz crystal is used for frequency stabilization, and the temperature and voltage change the transmission frequency without drifting.
     
    Product parameters:

    •   Output power: 50mW

    •   Audio frequency response range: 50Hz-18KHz

    •   Transmission frequency:

    •   Turn off campus broadcast 87.0MHz-108.0MHz, turn on campus broadcast 76.0MHz-108.0MHz

    •   Frequency adjustment step: 0.1MHz/time (short press), 1.0MHz/time (long press)

    •   Modulation mode: standard FM

    •   Equivalent noise: ≥30dB (sound quality is close to CD sound quality)

    •   Supply voltage: DC 3.0V-5.0V

    •   Working current: 35mA

    •   Transmitting antenna: 75cm rod antenna

    Launch distance: The FM transmitter module is connected to a 75cm standard rod antenna, and the radio uses the Desheng PL-660. The open field is covered with a radius of 100 meters. (Note: The launch distance is for reference only, due to the difference in usage environment)
     
    Note: This module is a radio-sensitive device. The interference from the power supply or nearby may affect the normal operation of the module. Therefore, it is recommended to supply a stable voltage to the power supply of the module by using a battery or a power frequency transformer. Can not use switching power supply (such as mobile phone charger, and any other switching power supply), charging treasure, switching DC-DC converter, there can be no working D-class power amplifier, microwave oven and other equipment that will generate high-frequency electromagnetic interference. Otherwise, the electromagnetic interference generated by these devices will be spatially coupled to the RF front end of the module, causing the received signal to generate noise.

    Symbol definition:

    1 (L): left channel audio output
    2(G): audio ground
    3 (R): right channel audio output
    4 (V+) : Short press volume + / long press continuous +
    5 (V-): Short press volume - / long press continuous -
    6(F+) : Short press a station / long press down to search for a station
    7(F-) : Short press the previous station / long press to search for the station
    8(P): Short press mute/long press full band search and save station
    9 (DM): USB DM cable
    10 (DP) : USB DP data cable
    11 (TX): TTL serial port sender
    12 (RX): TTL serial port receiver
    13 (+5V): 5V power input (3-5V wide range)
    14(G): power ground
    15 (ANT): External FM radio antenna end

    Instructions for use: 

    One: line connection

      All function outputs of this module are reserved for external ports. Users need to connect external line modules to work normally.


    <1>: Connect the audio cable

      The corresponding ports AGND, Output R, and Output L of the module are respectively connected to the ground, left channel and right channel of the audio transmission line.


    <2>: Connect the power cord

      The module corresponds to the port GND, VCC is connected to the negative and positive poles of the power supply (battery) respectively. The normal working voltage of this module is 3.0-5.0V, and the supply voltage should not exceed this range.


    <3>: Connect button

      All the buttons of this module are reserved for port, and the customer can access the corresponding function buttons as needed. The button can be used with normal? Touch the button, one end is connected to the corresponding button port of the module, and the other end is connected to the module GND or AGND terminal. Part of the button has a long press function (such as volume +/- long press for continuous +/- volume), long press for more than 2 seconds is valid.


    <4>: Connect the antenna

      The ANT port is used to connect the FM antenna. In order to better transmit (receive) the FM signal, it is recommended to connect an external 75cm rod antenna, and there is no obstacle obstruction near the antenna.


    <5>: Connect the USB cable

      If you need the USB audio broadcasting function of this module, you need to connect the USB cable to the computer. The USB port has four wires, which are respectively connected to the VCC, USB_DM, USB_DP, and GND ports of the module. Because the computer USB comes with a 5V output, you can use the USB port to provide power directly from the USB port.


    <6>: Connect to serial port (no need to connect to serial port control)

    The module reserves the TTL level serial port control interface. The TTL serial port communicates with this module. It needs to connect the module's UART_RX, UART_TX and GND. It can use the external MCU (microcontroller) or computer serial port to send the relevant functions of the command control module. Note: Because the computer serial port level is not TTL level, you need to connect RS323 level to TTL when connecting to computer communication, flat switch device or use USB to TTL level serial port module to communicate with this module. Because the serial command control module requires a certain amount of computer expertise, buyers who do not understand need not toss. All the information see baby instructions, customer service does not provide technical guidance on this side.


    Two: PC audio broadcasting

      After connecting to the computer USB, this module will automatically enter the PC audio broadcast mode, the LCD screen will display the PC, the computer will automatically install the driver, and give the module the sound card device named "CD002", which is enabled in the computer sound settings. To enable this "CD002" audio device, the system audio can be transmitted by FM FM in this module. The nearby radio frequency can be adjusted to the same as the module's transmission frequency to listen to the computer end system transmitted by this module. Audio.