Electret Mic

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Sopetard666

New Member

• Sep 22, 2011

• #1

I was at school in Electronic & House Wiring today and I was trying to figure out how to test an Electret Mic using a Multimeter to see if it would work or not and my teacher doesn't know either so I Need Help?

 

Last edited: Sep 22, 2011

4pyros

Well-Known Member

Most Helpful Member

• Sep 22, 2011

• #2

It needs power. look here; https://en.wikipedia.org/wiki/Electret_microphone

 

Boncuk

New Member

• Sep 23, 2011

• #3

Even without being properly powered an electret microphone produces voltage in the µV range.

Connect it to the multimeter using the lowest voltage setting for input.

Gently knock the capsule on a table and the DMM should read something between 15 and 30µV when knocked.

(not the DMM, but the microphone!)

Boncuk

 

Last edited: Sep 23, 2011

4pyros

Well-Known Member

Most Helpful Member

• Sep 23, 2011

• #4

Boncuk; How many multimeters have you seen go down to microvolts?

 

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colin55

Well-Known Member

• Sep 23, 2011

• #5

You cannot test an electret mic with a multimeter.
It must be put in a circuit, such as an amplifier, with the correct current flowing through the device. Listen to the result. If you deliver too much current the output will sound like bacon-and-eggs frying.
You should be able to hear a pin drop.