# find the output of capacitor microphone in theory or augur

1. ## find the output of capacitor microphone in theory or augur

Hello
how can find the output of capacitor microphone in theory or augur it without test in?

for example in these circuits what is the output of each circuit schematic?(max and min output)(dc and ac output voltage of microphone?)

Thanks

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2. ## Re: find the output of capacitor microphone in theory or augur

Heya baby_1,

The DC voltage present at the output will depend upon the bias current through the microphone, which is manufacturer/model/DC voltage/temperature dependent. Typically this current is of order a few hundred microamps, thereby dropping up to a few volts from the supply rail across the resistors shown. Because this voltage is rarely controlled or precisely known, these microphones are usually AC coupled (via a capacitor) to the subsequent amplifier stage.

The AC voltage is dependent upon the SPL (sound pressure level) incident on the microphone in addition to the microphone's responsivity (which is again frequency and voltage/current dependent!). I'd expect signals of order 10 to a few hundred mV max amplitude.
So many wishy-washy ill defined values! :)

As such, practical characterisation with the actual model you intend to use is the best way to predict how it will respond in your application (provided you've satisfied the bias current/operating voltages specified in the data sheet).

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3. ## Re: find the output of capacitor microphone in theory or augur

Hello & thanks thylacine1975

here is my two terminal capacitance microphone.
http://www.pixentral.com/show.php?pi...sKRa0NTIJUVs80

and it doesn't have any Datasheets ( i see only 23s text on it)
how can i find the it's' specification parameters.

can you give me a simple datasheet and example to find more about microphone outputs?

Thanks

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4. ## Re: find the output of capacitor microphone in theory or augur

here is a UK major components supplier with link going straight to a typical microphone insert :- http://uk.rs-online.com/web/p/conden...nents/3393951/
Frank

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