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我使用9v输入，但是一打开开关，输入电压变成2.5v了？
楼主可以传一下原理图和规格上来方便大家帮你分析
另外，注意你的测试调教是否过载
测试调教什么意思？我之前是做软件的，现在开始弄这个，没懂你的意思。
测试条件，抱歉打错字了
