Hello, 

I know this is not very Armbian related but no idea where to ask and maybe someone is able to help (because of lack of documentation). I would like to connect this microphone to OPi Zero gpio. It has:
1 5V
2 GND
3 USB-DM2
4 USB-DP2
5 USB-DM3
6 USB-DP3
7 LINEOUTR
8 LINEOUTL
9 TV-OUT
10 MIC-BIAS
11 MIC1P
12 MIC1N
13 CIR-RX

 

I would like to connect this microphone (picture) to gpio, if I understand it correctly, I need to use  MIC-BIAS, MIC1P, MIC1N. But this microphone has just two pins. How should I connect it to gpio please? And what should I activate in Armbian to be able to record from this microphone? (probably alsa, set device, which software to use for recording)

Take a look at schematic of some other OrangePis that has built-in microphone, for example OrangePiPlus2E, you will see how that Bias is providing current thru a resistor to one of the 2 microphone pins while another resistor is pulling down the other pin to GND. There are also filtering capacitors and coupling capacitors too.