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ADAU1761 self-oscillation  in  a megaphone

Question asked by kakachen on Sep 20, 2016
Latest reply on Sep 20, 2016 by KJBob

I use ADAU1761 as Microphone pre-amlifier and signal processing for a megaphone project.  System total gain is about

36dB.  it get horrible  self-oscillation when speaker sound feed back to MIC,  How can i kill the self-oscillation?  Does ADAU1761 has frequency sift tool?analog-admin