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怎么把LM2575可调芯片输出+8v,变成-8v,现在有一个+8v的电路图,怎么接成-8v,很急,,谢谢!!!

Other Parts Discussed in Thread: TPS5430

现在需要一个-8v的电源给电路供电,只有+8v的电路图,想问一下,怎么把这些变成-8v的,或者可以还有什么方案能让+8或者+12或者+5的正电源变成-8v电源,,谢谢了,很急用!!!