Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Problems with noise in condenser microphone.

Problems with noise in condenser microphone.

Problems with noise in condenser microphone.

What causes the humming noise from these microphones? Even if I only use a battery on the preamplifier, the noise will not dissapear. Is this noise caused in the preamplifier or is it general to these kind of microphones? Are there any differences between cheap and more expensive microphones?
The noise dissapear if I lower the voltage to under 2V, but that also reduce the effect very much.
Are there anybody here who can help me with this problem?

RE: Problems with noise in condenser microphone.

Humming is almost always due to picking-up 50 or 60 cycle signal from nearby power lines. The microphone and all low level signal lines need to be properly shielded from electromagnetic interference.

RE: Problems with noise in condenser microphone.

There should be no hum in microphone or preamplifier. I assume you are using an electret type of condenser microphone. These can require up to 40 volts phantom power. Be sure the preamplifier provides the correct voltage to the microphone and for most sound and vibration measurement instruments, be sure the instrument is AC-coupled to remove DC. You would have to provide a lot more details for specific help on this problem.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close