Mountain View BP1048 Bluetooth Audio DSP Amplifier Board

Precautions:
0. The Bluetooth chip requires firmware; the button resistance may need fine-tuning based on the firmware of the chip you purchased.
1. Before soldering the main control chip and op-amp, please be sure to measure the output voltage of the two LDOs to ensure they are correct. The Bluetooth chip power supply is around 4.5V, and the op-amp power supply is around 9V. The output voltage can be fine-tuned yourself.
2. Do not touch the Bluetooth chip with your hands after powering on; even a slight touch will damage it. It is recommended to order an acrylic panel from Taobao for protection based on the board frame size.
3. The bottom tantalum capacitor is optional. If you choose to solder it, be sure to choose genuine original tantalum capacitors. Do not buy refurbished products to avoid explosion.
4. Two decoy methods are provided. If the PD decoy CH221K is unavailable, you can use the HUSB238.
5. Again, please do not touch the Mountainview BP1048 Bluetooth chip casually; it is easily damaged by electrostatic discharge. It is best to wear an anti-static wrist strap when soldering.