介绍一种采用DAC0832作为数控衰减器构成的自动增益控制电路，其外围电路非常简单，受控等级可达256级。

Presented in this paper is a digital AGC circuit that is constituted with digital attenuator DAC0832. Its controlled grade can reach 256 and the external circuit is very simple.

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麦克风增益按钮，按下此钮会激活固定在麦克风内的衰减器，它是当本机工作在高噪音环境下使用。

Mic GAIN button. Pressing this button activates the built-in microphone attenuator. This feature is designed to be used when operating the Alan 9001 in high ambient noise environments.

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