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Noise can be heard from the assembled DIY U87 microphone
Old 22nd August 2019
  #1
Here for the gear
 

Noise can be heard from the assembled DIY U87 microphone

I purchased two “U87 clones” at “Mic And Mod”.

I assembled and tested two microphones, but there is noise in one of the microphones.

I will attach two microphone sound samples.
Is this noise an initial failure of the diaphragm?

If you are familiar, please let me know.
Thank you for your cooperation.


A Mic (No problem microphone)


B Mic(Noizy Mic)
Old 24th August 2019
  #2
Lives for gear
I doubt that what we are hearing is a diaphragm problem. That sort of unstable “bubbly” noise is more likely to indicate a powering problem (48v) within the mic, or a problem with components or wiring in the mic. Check your work?
Old 27th August 2019
  #3
Here for the gear
 

Thank you for your reply.

Therefore, the possibility of a defective diaphragm capsule is very low?
I'll try again to check for voltage calibration and soldering defects.
Old 27th August 2019
  #4
Lives for gear
That’s where I would start.
The possibility of diaphragm failure in a DIY build is actually much higher than it is in a factory product. The diaphragm is exposed to more chances of mishandling because it isn’t installed by someone who does a number of these every day and then tested in its assembly and screening as it would be at the factory.
But I don’t think the sound we are hearing is a torn or crumpled diaphragm.
Old 27th August 2019
  #5
Here for the gear
 

I am translating Japanese into English, so I'm sorry if the grammar / expression is wrong.

Thank you very much for your polite advice.
Old 27th August 2019
  #6
Lives for gear
Quote:
Originally Posted by bellsmarket View Post
I am translating Japanese into English, so I'm sorry if the grammar / expression is wrong.

Thank you very much for your polite advice.
Your English vocabulary and grammar are very good. I would never have guessed that you were writing in a second language.
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