Power supply and polarity Recommended power supply current is 2A or more. Do not reverse the polarity of the power supply. Connecting the positive and negative poles in reverse will burn the chip. This module is suitable only for a single power supply and cannot be connected to a negative power supply. Input signal and speaker wiring The input audio signal should be between 0.5V and 1.5V. The speaker cable should not be too long; keep it within 1 meter. Operating precautions and electrical limits The recommended power supply voltage is 824V DC. If the supply voltage exceeds 26V, the chip will burn. When connecting a 42ohm speaker, the power supply should not exceed 16V. When connecting an 8ohm speaker, the power supply should not exceed 24V. Use scenarios and applications DIY compact audio amplifier: pair with a 12V supply and a 42ohm speaker, feeding the module with an audio signal in the 0.51.5V range from a microcontroller or DAC. Small voice alert or buzzer system: use an 8ohm speaker with a supply up to 24V to produce audible alerts from a microcontrollerdriven audio signal. Educational electronics project: demonstrates singlesupply operation, polarity safety, and speaker loading constraints for learning about basic audio amplification and power limits.