Battery power supply circuit capable of converting positive voltage into negative voltage

A circuit for converting battery power supply positive voltage into negative voltage is characterized in that a 12V battery power supply outputs voltage + 8V through a power supply filter circuit and a first three-terminal voltage stabilization filter circuit in sequence, and outputs voltage + 5 through a DC-DC step-down circuit and a filter circuit in sequence; and the 12V battery power supply sequentially passes through the DC-DC step-down circuit, the oscillating circuit and the second three-terminal voltage-stabilizing filter circuit to output a voltage of-8V. By adopting the circuit capable of reducing voltage and converting positive voltage into negative voltage at the same time, the dynamic range of the sound box can be perfected with high cost performance, and the problem caused by early distortion of a large dynamic signal power amplifier of the sound box is solved. 一种电池供电正电压转负电压的电路，12V电池供电电源依次经电源滤波电路和第一三端稳压滤波电路输出电压+8V，12V电池供电电源依次经DC-DC降压电路和滤波电路输出电压+5，12V电池供电电源依次经DC-DC降压电路、振荡电路和第二三端稳压滤波电路输出电压-8V。采用一个