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How to control the gain of system for larger MIC signals?

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I want to apply voice to NBFM-TX ,I should amplify and filter it(300-3000HZ),but my problem it how to control the gain of system for larger MIC signals (prevent saturation or large signal to apply to VCO tune voltage) Is tehre any IC for this task? Is there any AGC IC for this(Automatic gain control of voice)
 

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