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I have been trying to record audio using the circuit below. It is different from the normal microphone circuit in that the MIC_IN and MICBIAS are separate paths. I tried to connect an electret microphone to the audio jack and short the MIC_RAW and MICBIAS2_RAW path but no sound was recorded. I used ALSA arecord to record. Does anyone know if I am connecting it correctly?

enter image description here

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    \$\begingroup\$ I gather that's probably the input circuit on the development board? It might be worth adding a bit more context on the software side, my guess is that MICBIAS is probably an output and possibly the drivers need MICROPHONE_DET to be high so also mention if you used a plug or tried connecting it directly. \$\endgroup\$ – PeterJ Feb 10 '15 at 10:07
  • \$\begingroup\$ Yes, it is the input circuit on the development board. For the software side, i am using arecord and the settings in alsamixer is setup according to the manual to enable the analog microphone. \$\endgroup\$ – user990639 Feb 10 '15 at 14:09
  • \$\begingroup\$ I am wondering if the circuit is ok as most other circuits have their MICBIAS and MIC_IN tied together.. \$\endgroup\$ – user990639 Feb 10 '15 at 14:10
  • \$\begingroup\$ Use a voltmeter and see , do you really have a bias there? \$\endgroup\$ – Dorian Apr 16 '18 at 11:04

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