TF Card MP3 Decoding Board Decoding Module 3.7-5V Power Supply With 2W Mixed Mono Memory Player ModuleItem NO.: TF MP3

TF Card MP3 Decoding Board

Product Information:

1. TF card MP3 decoding board, without TF card, supports playing MP3 music files. Currently tested for 16G TF card support, the larger one has not been tested yet

2. 3.7 Lithium battery or USB 5V can provide power,

3. The three sets of white boxes in the upper right corner of the board are three sets of touch buttons, the middle set is the play pause button, the up and down two sets of short presses are the up and down keys, and the up and down two sets of long presses are the volume+- adjustment.

4. It is recommended to use USB 5V power supply for USB flash drive playback, as some old USB flash drives are powered by 5V and do not support the 3.7V voltage of lithium batteries. Therefore, when powered by lithium batteries, the flash drive cannot play. The new USB flash drive can play normally as long as it supports 3.7V power supply.

5. Equipped with a 2W mono amplifier, the maximum output of the amplifier is 3W when powered by 5V. (It is recommended to pair it with a small speaker on a 4-ohm 3W card speaker, which has good sound quality and loud sound. If you feel that the volume is not enough, please directly replace the 4-ohm 5W speaker. The sound is loud enough to scare you. After replacing the 4-ohm 5W speaker, pay attention to the heat dissipation of the amplifier chip, and it is best to add a heat sink.)

6. Some customers have reported that the amplifier may generate heat when playing music. It is normal for the amplifier chip or amplifier tube to generate heat. As long as the amplifier is not turned on at high volume, the output end of the short circuited speaker (with a resistance value of 0 ohms) will not burn the amplifier chip and can be used with confidence.

7. Some customers need to go back and make this board the front stage of the power amplifier. They don't need the power amplifier of this board. Instead, they can connect the power amplifier themselves and modify it as follows: remove the power amplifier chip (8-pin chip) of the board, and then output it from the 4th and 6th pins of the main control chip (these two pins are the left and right channels of the main control chip), One 104 (or 224) capacitor can be connected in series to the input end of the power amplifier (the capacitor serves as an isolation function to prevent the previous main control chip or later power amplifier tube from burning when the same power supply is supplied), and the remaining wire is connected from the negative pole to the common end of the power amplifier input

8. If a customer needs to go back and modify this board to listen to music through headphones, remove the power amplifier chip (8-pin chip) of the board, and then connect a 104 (or 224) capacitor to the left and right channels of the earphone through the 4th and 6th pins of the main control chip (which are the left and right channel outputs of the main control chip) in series. The remaining cable is connected from the negative terminal to the common terminal of the earphone

9. Power on automatic playback

10. Loop playback with memory function, continue playing from the previous track after the next power on

11. Play Display with LED indicator light

12. PCB board size 34.23MM (left and right distance) * 22.33MM (up and down distance) * 1MM (thickness)

13. The maximum size of the appearance is 37.09MM (maximum distance left and right) * 22.33MM (maximum distance up and down) * 2.97MM (maximum thickness)

14. A 3.7V600MA lithium battery (043545) can be used for approximately 3.5 hours at maximum volume when fully charged, which is very energy-saving

Introduction To The Main Control Chip:

GPD2846A is a chip designed for MP3 players with FM radio and LineIn functions.

● Support MP3 playback format.

● Can play T card/SD card, USB flash drive, FM, and external audio source (LineIn), plug in first, or switch by Mode key.

● Automatically detects whether the earphones are inserted, and according to this, the IO port (Mute) directly switches on and off the external power amplifier without the need for an external transistor.

● Support storing volume, number of songs,... on T/SD cards, USB drives, users can save EEPROM

● It can automatically detect whether an external EEPROM is installed and determine whether it is stored on the EEPROM or T/SD card, USB drive, and save settings.

● Implement various key combinations using one AD key port.

● There are two sets of AD key keyboards to choose from.

● Supports three FM radio chips: RDA5807, BK1080, and RTC6207E.

● Infrared remote control is not supported.

● USB device mode is not supported.

● Supports USB audio mode.

● Packaging type: SOP16 packaging chip.

Product Application:

MP3 player with FM radio function, no screen mini speaker.