spirit532 / studio_mic Goto Github PK

Thank you for the fantastic design and instructions. I'm hoping your experience might help diagnose a problem I'm having.

Issue:
After a few minutes of use (varies, anywhere from 1 to 10 minutes), my microphone outputs a dull pop(s), after which the output goes very dull/dark and quiet.

I have attached:

• audio and an image illustrating the pop and change in output.
• an image of my board (in case there is an obvious error in the assembly?).

Audio.zip

Things I have tried so far (in case it helps troubleshoot):

• Unplugging and leaving overnight resolves the issue temporarily. The output is back to normal, until a few minutes of use reproduces the same issue.
• The issue occurs even if I don't interact with the mic (i.e. it's not triggered by input or humidity from my breath, it happens even if recording silence from a distance).
• I don't think it is a faulty capsule, board, connector or cable. I have tried multiple of each (I was building two mics so had spares).
• It don't think the issue is my audio interface. Mine has two inputs/preamps (Arturia Minifuse 2), and the issue happens with both. Switching between inputs doesn't resolve the issue once it starts. The issue doesn't persist if you switch to a second identical mic (again, I was building two mics so was able to test this).

Do you have any ideas what the issue could be? Is it possibly a phantom power issue? Thanks in advance.

Hi,

Thanks for the schematics and instructions, I've managed to build my own :) I wouldn't be able to come up with the design/know how to tune it but I did manage to understand how it works, with the help of the internet. I was just wondering, is it intentional that the PCB ground traces are not connected to the body? I did do the sanding of the body, it was all electrically connected from one end to the other, but I had huge amounts of hum (about twice the signal strength) until I connected the ground of the XLR to the body. Maybe the mounting holes could be plated and connected to the ground if this is necessary, or should this not have been necessary and maybe I did something wrong?

Thanks,
Rob