The main voltage of this power supply is positive and negative voltage output (optional), and the auxiliary voltage is a single set of positive 12V (with fan or horn protection circuit) Suitable for A-class power amplifiers, B-class power amplifiers, AB class power amplifiers, digital power amplifiers. In short, any power amplifier board that requires positive and negative dual voltage power supply can use this power supply (such as traditional discrete component power amplifiers, LM1875, LM3886 and other integrated circuit power amplifiers). It should be noted that the voltage of the power supply should be selected below the maximum allowable voltage of the power amplifier board. The power output is a direct current voltage, which can eliminate the need for conventional ring voltage rectification and filtering circuits. Not only is it more efficient and generates less heat, but the internal resistance of the power supply is also much lower. The filtering capacitor carried by the power supply itself is sufficient for daily use, and the filtering capacitor board can also be added to increase the filtering capacitance.