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Omni-directional microphone EMC9745P condenser microphone - ESUNTECH

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9mmx4.5mm  Omni-directional mini eletret microphone condenser mic capsule 9745  for household electrical appliances,computer,toy,telephone,cell phone,earphone,headset headphone,medical,meter and instrument - Changzhou Esuntech Co Ltd.        

图片5

Test Conditions:VS=4.5V,RL=2.2KΩ,Temp=20±2°C, R.H=60±5%

ITEM Symbol Test Conditions Min Standard Max Unit
Sensitivity   S f=1KHz, -40 -38 -36    dB
S.P.L=1μBar 0dB=1V/μBar
Impedance   Z f=1KHz,

2.2
S.P.L=1μBar
Directivity                   Omni-directional
Current  Consumption   I


500 μA
Operation Voltage Range   VS
1 2 10 V
S/N Ratio  S/N(A) f=1KHz,S.P.L=1Pa 55

dB
A Curve
Decreacing Voltage Characteristic   △S f=1KHz,S.P.L=1Pa

-3 dB
VS=4.5-3.0V
Max.Input Sound Level  MISPL f=1KHz,

115 dB
Distortion≤3%

图片2

TEST CIRCIUT

Vs:Source Voltage 2.0 V   RL:Load Resistance 2.2

3

Test Setup Drawing

333




Company introduction and workshop photos


 Changzhou Esuntech Co.,Ltd



Changzhou Esuntech Co.,Ltd. is a commitment to high-quality locates in Jiangsu near Shanghai which is convenient for goods transportation and customer visiting. And we have Electromax Co as the agent  in Seoul Korea. Main Poducts: Buzzer: piezoelectric (piezo) vibration element, piezoelectric buzzer, magnetic buzzer, SMD buzzer Speaker: piezo tweeter, mylar speaker, loudspeaker, tweeter speaker, TV speaker, car speaker, multimedia speaker, woofer, sub-woofer, waterproof speaker etc Ultrasonic sensor: for car parking system or distance tester.

 


Company Advantages:

 

We have excellent engineer (including Korea engineer)and we are focus on product innovation , Management innovation.The quality of product was recognized by customer from all over the world.Our products are sold more than twenty countries and regions around the world.our products are widely recognized  by them.And we have long-team relationship with the client.

 



Marketing Countries:   

 

USA, Korea, Brazil, Canada, Russia, Turkey, Spain, Germany and so on.

 

Production Line



Production Line


Inspection and quality control


Inspection and quality control


Packgage, Warehouse & Delivery


Packgage,Warehouse & Delivery

 


Product introduction


Esuntech Electret Condenser Microphones have found applications in a broad variety of uses such as telephones, high quality and small recording devices, hearing aids, megaphones, headsets microphones, hands free devices and so on. The electret microphone was invented at Bell Labs in 1962 by Gerhard Sessler and Jim West. The externally applied charge in a condenser microphone is replaced by a permanent charge in an electret material. An electret is a ferroelectric material that has been permanently electrically charged or polarized.


Due to their good performance and ease of manufacture, hence lower cost, the vast majority of microphones made today are an electret microphone; estimated global annual production is over one billion units. Most all cell-phone, computer, PDA and headsets microphones are electret types. Though the electret microphone was once considered low quality, the best ones can now rival traditional condenser microphones in every respect and can offer the long-term stability and ultra-flat response needed in measurement microphones. Unlike other capacitor microphones, they require no polarizing voltage.


The Esuntech electret microphone selection includes Noise CancelingUni-DirectionalOmni-Directional versions with a range of sensitivity and sizes to cover all typical requirements.


 


Application:


Headphones

Earphones

Wireless earphones

Smart speaker

World’s smallest Active Noise Cancelling Applications



 


FAQ


1. Are they compliant with RoHS directive?


All Sound Components (Piezoelectric / Electromagnetic Sounders, Piezoelectric Diaphragms, Piezoelectric / Electromagnetic Buzzers) on our Website are compliant with  RoHS directive. 


2. I would like to know procurement lead time


Please contact us when you need the latest lead time information because it will be changed depend on the market condition.

 

3. What about the Minimum Order Quantity?


Please confirm with the sales before placing the order. If there are raw materials in stock, 1,000 pieces of a single variety are acceptable.


4.Can you provide samples?


Of course, we can provide 5 free samples, and the sample delivery time is 7-10 days.





Notice


① The products must not be washed.


② Storage Condition:

The products should be stored in the room,where the temperature/humidity is stable.

And avoid such places where there are large temperature changes.

Please store the products at the following conditions:

Temperature:-10 to +40℃ Humidity: 15 to 85% R.H.


③  Expire Date on Storage:

Expire date (shelf life) of the products is six months after delivered under the conditions of a sealed and an unopened package.

Please use the products with  six months  after delivered.


④ Notice on product Storage:

Please use the products immediately after the package is opened, because the characteristics may be reduced at quality.



ABOUT US

We have excellent engineer (including Korea engineer)and we are focus on product innovation , Management innovation.The quality of product was ...

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CONTACT US

+86-0519-85132681
No.2228,Fudu Shangwu Building, No.398 Tongjiang Road, Changzhou, Jiangsu-213022, China
© 2021 Changzhou Esuntech Co.,Ltd All rights reserved.