Electronic – Do electret microphones have polarity


So do electret mics have polarity?
The following circuits seem to contradict each other…


How to wire an electret mic to radios without phantom power on the audio wire


Electret mic capsule schematic

Now the problem is one image shows polarity while the other one does not!!
What's the holdup here?

Best Answer

Yes, they have polarity and it has to be right to work- the output needs to be biased positive with respect to the ground terminal.

The ground/GND terminal should be common with the case, so you can check polarity with a multimeter.

Here, from a Panasonic Datasheet, is a typical arrangement:

enter image description here

The two diagrams you show are equivalent, one is just drawn upside-down (potentially.. as it were.. confusing and not to be encouraged, but still valid).