Are this Chinese made SMPS power supply compatible with LA 4440 IC? I mean that can I use it for any audio amplifier or Bluetooth mp3 FM module? Please tell me! If I can use it, then please tell me how I can do it?
The datasheet for the LA4440 shows a minimum supply of 8V but your 12.1V is fine. They show spec's with a 13.2V supply but with 12.1V the max output power will be a little less.
It will produce about 5W per channel into 4 ohms with horrible 10% clipping distortion or about 3.8W per channel with no clipping.
The very cheap SMPS might produce interference noises in the sound.