Description

Features:

1: Using advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation technology (PLL) to make the sound quality more realistic, the performance is more stable, and the working frequency for a long time has no offset

The received signal is good, and 22 stations can be received locally.

2: The LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference.

3: It has the function of automatically searching for radio stations and storing radio stations, which is easy to operate and use.

4: Built-in 30-level digital volume adjustment, button operation can be easily completed.

5: The data before the power failure is automatically memorized when the power is turned off.

6: Quartz crystal is used to stabilize the frequency, and the transmission frequency no longer drifts when the temperature changes.

7: The full frequency band (76-108MHZ) automatically searches for the signal frequency band and stores the memory.

8: Built-in rechargeable lithium battery and charging circuit, you can charge it with a mobile phone charger, the red light is on when charging, and the green light is on when fully charged;

Ships without battery

Product parameters:

PCB board size: 6.3CM*4.4CM

Shell size: 11.9CM*8.8CM*2.7CM

Support speaker: 8 ohms within 5W

Output power: 5W

Frequency response range: 50Hz-18KHz

Channel: use speaker for mono, use earphone for dual channel

Ordinary stereo headphones with a diameter of 3.5mm can be used, but if you buy one with a shell, you need to pay attention: the diameter of the headphone handle must be less than 7mm! Otherwise it won't go in.

Receiving frequency adjustment range:

Close campus radio 87.0MHz-108.0MHz, open campus radio 76.0MHz-108.0MHz

Equivalent noise: ≥30dB

Supply voltage: 3.0V-5.0V

Battery model: 18650

Package battery capacity: 1000MAH, it can be used for about 7-8 hours when fully charged.

Precautions:

Do not touch the components on the back of the module during operation, so as not to affect the normal operation of the module or cause a short circuit to burn the module.

This module is a radio-sensitive device, and interference from the power supply or nearby may affect the normal operation of the module. Therefore, it is recommended to use a battery or a power frequency transformer to obtain a stable voltage after voltage stabilization for the power supply to the module. Switching power supplies (such as mobile phone chargers, and any other switching power supplies), power banks, and Class D power amplifiers, microwave ovens and other devices that are working nearby cannot be used.

Otherwise, the interference generated by these devices will affect the receiving effect of this module. Friends who buy the module and develop it by themselves, please pay attention.

Instructions for use:

After each module is completed, it will automatically search for stations first. Press and hold the "Auto Search (AUTO button)" to automatically search and store the radio stations that can be listened to.

After the search is completed, the first radio station P01 will be played automatically. The user can press the "previous station" or "next station" key to switch the searched station.

This module can set the backlight status and whether to listen to the campus radio frequency band according to the specific usage of the user. The setting method is as follows.

In the power-off state, press and hold the VOL+, VOL- key, then power on and turn on the LCD display C1 means to open the campus radio C0 means to close the campus radio frequency band, the setting will take effect after restarting.

To set the backlight state, press and hold the up and down radio buttons at the same time when the power is off. The display shows B1 means the backlight is always on, B0 means the backlight is turned off for 20 seconds, and the settings take effect after restarting. To change the setting state Repeat this step to switch. The factory is uniformly set to not open the campus broadcast frequency band, and the backlight will turn off for 20 seconds without any operation.

To charge the battery, please use the charging interface next to the main board, do not use the charging interface that comes with the charging module, this is because the charging interface on the main board is added with a switch control circuit, and the radio cannot be used when charging.

list：

1*FM FM digital radio DIY parts with power amplifier with shell speaker