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关于fsa8049不能正常工作问题



 请工程帮忙确认一下图中FSA8049连接是否正确,现在遇到的问题是连接耳麦L/R输出声音正常,耳麦话筒讲话声音没有从FSA8049_B1脚输出来,测量B1脚MIC_BIAS电压2.5v正常,B3脚连接耳麦正极就没有电压。