I am trying to use an electret mic with beaglebone. Instead of making a preamp, I am using a locally made 'audio board'. This is the instruction slip that came with it :
However, I do not understand how to connect an electret mic to this. The "1 core pickup wire to V.c" is supposed to do the job. I'm attaching a picture of the wire :
I tried connecting the outer strand to the ground of the electret mic and the inner strand to the other terminal. The blue wires are supposed to go the speaker. I connected one to the ground of the beaglebone and the other to an analog pin. Reading the pin did not give me any meaningful results (yelling at the mic didn't increase the value).
Assuming (arbitrarily) that the problem is not with the BBB, can I be wiring the audioboard correctly? I gave 6 v power supply to the board. In any case, I do not understand how my configuration (outer strand ground, inner strand other terminal of mic) can be equivalent to that in the instruction (there are sort of 3 lines in the diagram, and a resistor). What, do you think, could be wrong here?