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DC offset in audio ADC

Question asked by lallison Employee on May 15, 2015
Latest reply on May 20, 2015 by KJBob

Re-post for user: Jackie This question was inadvertently rejected

 

Hi,

 

I found a DC offset in ADC data.

I connect a moving-coil microphone to ADC via a 10uF cap( of course there is an amplifier , and an in-serial 18K resistor). After linear gain - EQ - volume control - ....flow, by the end sent to an uC. No DC control in the schematic.  We can see an DC offset in the signal. I want know where it comes from? Thank you.

 

Jackie

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