Condenser Microphone These condenser microphones are widely used in electronic circuits to detect minor sounds or air vibrations which in turn are converted to electrical signals for further use. This condenser microphone has  two legs which are used to make electrical connection with the circuit. The two plates of the capacitor, which is the heart of the microphone, The diaphragm (inside the metal body) is a very thin film of conducting metal. It is deformable and elastic in nature. The diaphragm is pasted on a solid hollow ring which provides the necessary support to the diaphragm. The back plate is a thick solid perforated metallic plate. It is coated with a permanently charged electret material to eliminate the need of polarized power supply. These electrets are made by melting a dielectric material (like wax, plastic, etc) that contains polar molecules and solidifying them back in a strong electrostatic field. The polar molecules of the dielectric material are inclined towards the direction of the electrostatic field and create a permanent electrostatic bias in them. In the modern microphones, PTFE (Poly Tetra Fluoro Ethylene) plastic is used to form the electric material. The design of the holes plays a very vital role in reducing the air damping and mechanical thermal noise. The two plates have a small gap between them to allow the movements of diaphragm. A very fine thin film of plastic is placed between the two plates to provide electrical insulation. The diaphragm moves in the air gap between the plates with the slightest disturbance caused in the surrounding air pressure by the sound signal. If you want to use this condenser microphone in your project, for that you will need few essential components like batteries or power supply , IC , resistors and capacitors . Features: Low noise Low power consumption Suitable for a wide variety of Electronic products Multi-channel High signal to noise ratio High resistance to vibration check out : INMP441 MEMS High Precision Omnidirectional Microphone Module I2S

INMP441 MEMS High Precision Omnidirectional Microphone Module I2S The INMP441 is a digital MEMS microphone that is omnidirectional and has a bottom port. It is designed to be high-performing and low-power, and the complete solution includes a MEMS sensor , signal conditioning, analog to digital converter, anti-aliasing filter, power management, and a 24-bit I2S interface that is industry-standard. The I2S interface is especially useful because it allows for direct connection to digital processors such as microcontrollers and DSPs without the need for an audio codec. With a high signal-to-noise ratio, the INMP441 is a great option for applications in close proximity. It also has a flat wideband frequency response that results in natural and high-definition sound. Interface definition SCK: Serial data clock for I2S interface WS: Serial data word selection for I2S interface L/R: Left/Right channel selection. When set to low, the microphone outputs a signal on the left channel of the I2S frame. When set to high level, the microphone outputs signals on the right channel SD: Serial data output of the I2S interface. VCC: Input power, 1.8V to 3.3V. GND: power ground NMP441 connection with ESP32 SCK -GPIO14 SD – GPIO32 WS – GPIO15 L/R – GND GND – GND VDD – VDD3.3 Features: Digital I2S interface with high precision 24-bit data High signal to noise ratio is 61 dBA High sensitivity – 26 dBFS Stable frequency response from 60 Hz to 15 kHz Low power consumption: low current consumption 1.4 mA High PSR: -75 dBFS

M5 Stick Microphone Unit (LM393) The microphone unit is a sound sensor with a built-in omnidirectional electret microphone. The signal is amplified and output by microphone preamplifier max4466. The amplifier can effectively suppress power supply noise and common mode noise, and the output signal has high sound recovery and can be used in noisy environments. The unit can not only output analog signals, but also output digital level signals. The built-in LM393 double voltage comparator can set the comparison voltage threshold by adjusting 10K adjustable resistance. The sensor is very suitable for acoustic electrical conversion, audio recording/sampling, FFT acoustic feedback, voice switch, and other projects. Applications: FFT Spectrum Display Audio Sample / Record Voice Switch

Raspberry Pi USB2.0 Mini Microphone This is a tiny USB Microphone that plugs into your Raspberry Pi, laptop or desktop computer. No microphone on your computer? No problem - just plug this incredibly small microphone into a USB port and add microphone functionality. No need to install any extra software; Raspberry Pi / Microsoft Windows will detect the device and automatically install it. Simply launch within any program such as Skype or Google Hangouts. Please Note: best used in a port that's not near your computer's cooling fan. Note: Iotcart is the authorized sellers of Raspberry Pi products in India. Therefore even if you are in Bangalore, Hyderabad, Kerala, Mumbai or Pune, you can buy Raspberry Pi USB mini microphone online from Iotcart at the comfort of your homes.

Sound Sensor Module This Sound Detection Sensor Module consists of a Microphone, resistors, capacitor, potentiometer, comparator LM393 IC, Power, and status LED in an integrated circuit. Sound Detection Module Sensor for Intelligent Vehicle Compatible With Arduino is a Single channel signal output Sensor. The output is effective to the low-level sound signal with good fidelity, When there is sound, outputs low level and signal light. It can be used for Acoustic control light, give sound and light alarm working with the Photosensitive sensor, and sound control, sound detect. (The Maximum induction distance is 0.5M). This is an Arduino compatible module. Using this module you can even measure the intensity of ambient sound. Most of the digital sound sensor module just provides digital output i.e. if the sound is present or not. But this Sound sensor module also provides an analog output voltage that is directly proportional to the intensity of the ambient sound. Read our blog explaining the classification of sensors in IoT detailing 5 core classifications depending on how they work, 10 types of sensors, and the Characteristics of Sensors in IoT. Check out our collection of sensor at great prices! Applications: Hearing aids Telephones Tape recorders and karaoke Live and recorded audio engineering Radio and television broadcasting Speech recognition technology read our blog explaining what is sound sensor , provides information about sound sensors, covering their working principle, features, applications, and interfacing with Arduino.

USB Microphone for Raspberry Pi The USB Microphone for computers provides a very high-quality noise-canceling sound. The computer microphone has a simple on and off switch and therefore it is easy to operate. Raspberry Pi USB Plug and Play Desktop Microphone is USB Microphone that offers compatibility with any plug-and-play enabled Raspberry Pi Model B+, 2 model B, Raspberry Pi 3 as wells as it is also compatible with PC and Mac,  Ideal for Chatting on Skype for video chat or useful for the recording of sound. The Mic has an advanced digital USB that provides superior clarity with the simplicity of a single USB plug–and–play connection. The microphone pivots on base to hold a preferred position Note: Iotcart is the authorized seller of Raspberry Pi products in India. Therefore even if you are in Bangalore, Hyderabad, Kerala, Mumbai or Pune, you can buy USB Microphone for Raspberry Pi online from Iotcart at the comfort of your home.