87-108MHZ Digital Stereo FM Radio Receiver Board DSP PLL LCD Display Noise Reduction Frequency Adjustment

Description

Description:

1>. Output power: 100mW
2>. Audio frequency response range: 50Hz-18KHz
3>. Transmission frequency: 87.0MHz-108.0MHz (power transmission campus); 76.0MHz-108.0MHz (power transmission campus)
4>. Stepping frequency adjustment: 0.1MHz/times (short key press); 1.0MHz/times (long key press)
5>. Modulation mode: standard FM
6>. Soundbar: Line/USB channel (stereo); Channel microphone (one channel) 7>. Noise equivalent:>= 30dB
>8. Power supply voltage: DC 3.0V-5.0V 9>. Operating current:
10>35mA. Adaptive antenna: 75cm antenna bar

Application:

1>. FM wireless frequency
2>. USB PC audio transmission
3>. Wireless microphone
4>. Maternal and infant custody

Instruction:

1>. Power supply
The parallel port of the module “-“, “+” respectively connects the power (battery) negative pole positive pole. The power supply is recommended for a battery or other stabilized power supply. Do not use a filtered power supply (such as a cell phone charger and other low-quality switching power supply), otherwise the interference of the power supply will affect the normal work of the module. The normal working voltage of this module is 3.0-5.0V, and the power supply voltage should not exceed this range.

2>. Buttons
volume +/-: short press volume +/- 1, long press continuous +/-.
Frequency +/- : short press frequency +/- 0.1mhz, long by continuous +/- 1mhz.
Mute: Short press to mute/unmute.

3>. Antenna
The ANT is used to connect the FM antenna. In order to better transmit the FM signal, it is recommended to extend the antenna with a length of 75cm. and the antenna as close as possible without obstruction.

4>. USB audio connection
If you want to start the USB audio transmission function of this module, you need to connect the USB cable to the computer. USB port is compatible with common cell phone, so you can use a USB cable to connect the module and computer. Because the computer USB comes with 5V output, USB connection can be used to supply power to the module directly. After connecting to the computer USB, the module will automatically enter the computer audio transmission mode, the LCD screen will display the computer, the computer terminal will install the driver automatically, and the module will be named “CD002” sound card device. Enable this “CD002” audio device in the computer sound settings. Computer audio system can be transmitted through this module by FM. When the radio frequency is adjusted to the frequency of this module, the audio of the computer terminal system will be heard.

5>. Audio line connection
If you need this module line (line B) channel as the source of the sound emission, please insert one end of the audio line into the 3.5mm audio jack of the module, insert the other end into your audio device (such as a mobile phone headphone hole), the module will automatically Switch to the launch of audio source line channel as FM. The nearby FM radio can be heard by the mobile phone as long as it is tuned to the same frequency as the module.

6>. FM wireless microphone
If you need a microphone of this module to launch, pull out a line and USB cable (USB line are not connected). The module is automatically transferred to the microphone channel and audio transmission source of FM. This module is equipped with a sensitive electret microphone, which can be used in wireless microphone, mother-baby monitoring and so on. Note to adjust the volume of this module to achieve the optimal sound pickup effect when used.

7>. Serial port control (please ignore this part without serial port control)
The module reserves the TTL level of the serial port control interface. When TTL serial port communicates with this module, it should connect the module’s UART_RX, UART_TX and ground. You can use the external MCU or the computer serial port to send control module instructions related functions.

Note:
– The computer serial port is not TTL level.
– When connecting to a computer communication, it is necessary to connect the RS323 level TTL power leveling device or use USB TTL level serial port module to communicate with the module.
-Serial command control module requires a certain computer expertise, if you do not understand, please do not try.

User settings:

1>. Setting of LED backlight mode
When the device is off, press “FRE-” and “FRE+” at the same time to start. B1 indicates always bright. B0 indicates that the backlight is closed for 20 seconds, and the reset setting takes effect. (defaults to 20 seconds of backlight delay).

2>. To start/close the campus radio frequency band
when the device is off, press VOL +, VOL-, and power on. LCD display C1, which means to start the broadcast campus. C0 means closing the campus radio frequency band. Set to take effect after restart. (defaults to closing the campus radio frequency band).

3>. Settings of stereo/mono transmission The back
of the module has two solder joints M,G. Short connection is mono launch. Disconnecting these two points is the stereo system launch. (The factory defaults stereo system launch).

Note:
Stereo system must provide the input module of the audio source is stereo and the radio is also stereo to achieve the stereo effect. When using one speaker (mono) radio or input module of an audio signal as mono, there is no stereo.

Attention usage:

1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module.
2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause a short to burn the module.

User settings (see above):

This module can set the backlight mode and whether to listen to the campus radio frequency band according to the user’s specific use