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doubts regarding electret microphones

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antonyrajan

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i need to know companies providing free samples of electret microphones
thanking you
 

I do not know any company offering electret microphones for free. You can find such good microphones in many discarded old tape recorders/players or in hands-free earphone-microphone sets for cell phones. Those microphones usually survive best of all other components. Do not forget they need to be fed by DC 3...12 V through a 12k...50k resistor on their output.
 

I do not know any company offering electret microphones for free. You can find such good microphones in many discarded old tape recorders/players or in hands-free earphone-microphone sets for cell phones. Those microphones usually survive best of all other components. Do not forget they need to be fed by DC 3...12 V through a 12k...50k resistor on their output.

Thank u for you replay
in my project i need a electret condenser microphone with diameter less than 3mm and a sensitivity greater than -44 dBV/P,self noise < 28dB, with flat frequency response.
 

Such small electret microphones you can find in discarded cell phones. They are SMD and ~3..4 mm in diameter. You will have to test their parameters. I saw SMD miniature microphones in advertisement but I do not know if samples are available for free.
 

thank u for the replay...
i have one more doubt..can we use electret microphone with out inbuilt FET pre amplifier (Electret condenser cartridge) as a speaker ??
which type of speaker that we can use as a microphone where speaker size should be less than 4mm.
 

thank u for the replay...
i have one more doubt..can we use electret microphone with out inbuilt FET pre amplifier (Electret condenser cartridge) as a speaker ??
which type of speaker that we can use as a microphone where speaker size should be less than 4mm.

I do not think so. Tiny speakers are also used in cell phones but I have not seen them in sizes under 4 mm. Try google, there are some ultrasonic piezo speakers available recently.
I am no acoustics expert but I know that sound conversion efficiency is a third-order function of transducer diameter. What you want does not make much sense to me.
On the other hand, pressure speakers utilize a "normal" size speaker with an added conical pipe in which air speed increases; at the small-diameter end the power is high and directional. Such devices are used in "megaphones", try to use such principle.
 

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