Understanding Microphone Sensor Sensitivity: Explained by Experts

[rama1001]

Hi,
I have a microphone sensor and when i am reading that datasheet, they have written it in as SENSITIVITY -12mV/Pa. I am not sure, what does it mean. Can someone clear me?

 

[f95toli]

It presumably just means that the signal from the microphone will be -12mV per Pascal (i.e. if the sound pressure is 1 Pa it will give you -12 mV, 2 Pa -24 mV).

For reference: 1 Pa is something like 95 dB (SPL=sound pressure level); i.e. quite loud.

 

[rama1001]

It presumably just means that the signal from the microphone will be -12mV per Pascal (i.e. if the sound pressure is 1 Pa it will give you -12 mV, 2 Pa -24 mV).

For reference: 1 Pa is something like 95 dB (SPL=sound pressure level); i.e. quite loud.

I have one more dount that in the same datasheet they have given operating impedance as 5600ohms. What does that mean?

 

[dlgoff]

Impedance is the ac equivalent of dc resistance.

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/imped.html"

also see

http://en.wikipedia.org/wiki/Electrical_impedance"

 

[rama1001]

I desined my circuit with some amplification part after microphone. Here, When i play sound at microphone which gives output as more than 2volts. When there is no input at microphone
(silent), still the output is between 600mV to 1V. I don't know why this voltage is coming as output even there is no input at microphone.
My opamp gain is 1000 and it is powerd by single ended with 3V dc. I am using instrumentation 122A amplifiler.
I thought this was due to powering and gain. Is that right? or am i missing some thing.