electret microphone output

[kthompson]

I need to do some analysis of an FM transmitter circuit that is using
an electret microphone for input. Does anybody know what kind of the
amplitude an electret's output would be? I have been combing the web
and datasheets and haven't found anything conclusive. Even an order of
magnitude would be helpful.

Thank you in advance for any assistance.

 

[Richard Seriani]

"kthompson" <thompsonk87@gmail.com> wrote in message
news:5a143096-3bbd-4910-8624-357252d9b95d@s36g2000prg.googlegroups.com...

I need to do some analysis of an FM transmitter circuit that is using
an electret microphone for input. Does anybody know what kind of the
amplitude an electret's output would be? I have been combing the web
and datasheets and haven't found anything conclusive. Even an order of
magnitude would be helpful.

Thank you in advance for any assistance.

Looks like it may depend. The white paper at
http://www.national.com/nationaledge/dec02/article.html says 0.1-10mV
average, 100 mV peak.

A couple of manufacturers where you MAY be able to get more info:
http://www.globalsources.com/manufacturers/Electret-Microphone.html

Good luck,

Richard

 

[Phil Allison]

"kthompson"

I need to do some analysis of an FM transmitter circuit that is using
an electret microphone for input. Does anybody know what kind of the
amplitude an electret's output would be?

** Entirely depends on the level of sound impinging on the mic - silly.

I have been combing the web
and datasheets and haven't found anything conclusive.

** Cos the question has no possible answer.

Even an order of
magnitude would be helpful.

** First - define the nature of the sound and the distance from it to the
mic.





........ Phil

 

[Phil Allison]

"kthompson"

Phil, we are working with a portable FM transmitter so the distance
from the microphone is somewhat arbitrary.

** So then will be the levels coming from the mic.

We have been testing
everywhere from an inch away to 20 feet across the room. That is the
reason that I was asking for a general range.

** Which is utterly stupid as there is none.

The source of the sound is the human voice.

** Really?

Whispering, shouting, singing or what ??

Again, I appreciate the help and I got the answer that I needed.

** No you did not - you complete wally.

Piss off.



........ Phil

 

[kthompson]

I appreciate the help Richard. The white paper from National
Semiconductor was extremely enlightening. Also learned some other
things about the electrets that I was not aware of.

Phil, we are working with a portable FM transmitter so the distance
from the microphone is somewhat arbitrary. We have been testing
everywhere from an inch away to 20 feet across the room. That is the
reason that I was asking for a general range. The source of the sound
is the human voice.

Again, I appreciate the help and I got the answer that I needed.

Kyle

 

[Eeyore]

kthompson wrote:

I need to do some analysis of an FM transmitter circuit that is using
an electret microphone for input. Does anybody know what kind of the
amplitude an electret's output would be?

Depends how loud you shout !

Gragam