Lossless HIFI sound quality MP3 with Bluetooth

The project introduction text is copied from here: https://oshwhub.com/wzw666/LF411-MP6905HD

Notice! This project may not be used for any commercial purposes, please abide by the relevant open source agreements!

The main control IC is Jerry's AC6905A, which has low power consumption and simple peripherals.

It mainly plays files through TF card reading (actually measured, it can read TF memory cards with a capacity of up to 128G). It is also equipped with a Bluetooth function, which can output the signal received by Bluetooth through the headphones.

Equipped with TP4057 charging chip, dual lights (yes/no) to indicate charging completion status

Four button control, can switch TF card reading/Bluetooth receiving mode. Pause/play, next song/volume +, previous song/volume -

The toggle switch controls the operation, and when the power is turned off, the last played music file, volume setting and playback progress are memorized (related to the IC burning program, you can buy this kind on Taobao, which costs about 3 yuan)

The PCB area is further reduced, the analog ground and the digital ground are perfectly isolated, the sound quality is extremely good, the Bluetooth antenna is optimized, the Bluetooth distance is measured to be 10m, please see the attachment for the APP and information

actual use:

back:

Please note that the resistor connecting the CD pin of the SD card to CLK cannot be omitted. It is used to detect when the card is inserted. If it is omitted, it will look like this:

You’ve all seen this, give it a thumbs up and go away (*╹▽╹*)