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ＨＣ３３１１１是音频电路中的专用压扩芯片。文章介绍了ＭＣ３３１１１的特点、工作原理、引脚功能，最后介绍了应用及设计时需注意的事项．
HC33111 audio circuit is dedicated companding chip. The article introduced the MC33111 characteristic, the working principle, the pin function, finally introduced the application and the design must pay attention to the matters.