This story is about ultra low-cost Chinese mp3 player. It looks like iPod shuffle, but costs about 1$-2$. Its usual name on Aliexpress looks like: Mini Clip Mp3 Player Portable Music With Micro TF Card Slot (MP3 ONLY) Can Use As USB Flash Dish Up To 8GB Support.
1) Support MP3/WMA audio formats.
2) Support up to 32gb external micro SD card microSD карты
3) Can be used as card reader
4) High speed USB2.0
5) Built chargeable lithium battery
7) Main colors : Black, Silver, Green, Red,blue.
8) Driver free for windows 2000or above
9) Dimension: 4.2*3.8*2.2CM
Okey. Let’s see it!
Unscrew top panel.
It’s amazing! Inside there is only one chip GPD2806C-004A, two resistors, a zener, connectors, 5 buttons and that is all!
I`ve found its datasheet on Chinese (GPD2101A Datasheet)
This is the main specification:
1) Chip has microSD interface connector with hot-plug features.
2) mp3 playing back from SD card.
3) Chip works like card-reader via USB.
4) No external oscillator or quartz needed.
5) There is an opportunity to work with external FM-receiver (AR1019) or external EEPROM via I2C bus.
6) Automatic determination of existing FM-receiver or external EEPROM on PCB.
7) Up to three GPIO avaliable for control buttons.
8) Direct headphone connection
(For more info please read the original Chinese datasheet)
I made tests of work in card-reader mode. The maximum speed of reading and writing with microSD Kinston 10 class is 890 and 795 KiloByte per sec.In fast this is the equivalent to the USB 1.0 specification.
Battery has no marking identifications. But it is found on Ali like PL402223 – LiPol battery 55 mAh. You can note (using the previous photos) that battery doesn’t have a charging controler. Main PCB doesn’t have any charging controllers too. That’s why you should be very careful with charging process! It will be so easy to damage the battery if it is the overcharged!
As a result, the real specification:
1) Supported audio format: mp3 only
2) No internal memory, only external memory microSD up to 32 Gb
3) Card-reader mode via USB 1.0
4) No FM receiver
5) Li-Pol Battery 55 mAh
Imho, the quality of sound is good, and player works fine like any other mp3 player.
As a conclusion. It is mp3 player at a Low price by only 1$. Be careful! Do not charge it for more than 2 hours from PC USB port.