How to use an electret microphone
An electret is a permanently charged dielectric. It is made by heating a ceramic material, placing it in a magnetic field then allowing it to cool while still in the magnetic field. It is the electrostatic equivalent of a permanent magnet. In the electret microphone a slice of this material is used as a part of the dielectric of a capacitor in which the diaphram of a microphone forms one plate. Sound pressure moves one of its plates. The movement of the plate changes the capacitance. The electret capacitor is connected to an FET amplifier. These microphones are small, have excellent sensitivity, a wide frequency response and a very low cost.
The terminals:
The terminal with a solder mark(connecting to the case) is negative and the terminal without a mark is positive.
Projects the use electret microphone:
1. FM transmitter- circuit 1: This is a DIY kit. A low cost and excellent DIY kit for amateurs to begin with FM transmitter. This project uses electret microphone.
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1 Transistor FM Transmitter DIY Learning Kit
US $9.5056 items soldAdd to cart
1 Transistor FM Transmitter DIY Learning Kit
US $9.5056 items soldItem Location: Sydney, AustraliaYou can use this FM transmitter/microphone in two ways:a. Audio transmission using electret microphone: You can transmit your voice to FM radio with the electret microphone.b. Audio transmission connecting speaker stereo jack to the audio source: For hearing a better sound, you may connect it to your computer, iPod or mp3 player using a speaker jack.
107 in stock
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2. FM transmitter- circuit 2: This is a one-transistor FM transmitter. It is a good circuit for beginners. It also uses electret microphone.
3. Clap switch: It is a simple clap switch circuit. It can be a good start for electronic beginners.
4. Clap switch DIY kit: It is an easy and low cost DIY kit for electronic beginners. This kit is available on buildcircuit.net
5. Clap switch using 3 modules: It is one of the interesting projects of BuildCircuit. This project shows how you can build a clap switch using three different and independent circuit modules.
Other DIY Kits from BuildCircuit.COM
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2CH X 100W + 200W 2.1 Channels Bluetooth Audio Amplifier Board – TSA7500
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It has a perfect class-D architecture (based on TPA3221) and 2 channels have 100W power outputs and another one channel has 200W power output.
All the channels are capable of outputting nominal power simultaneously and continuously. This board can be powered by any DC 12V-30V power supply. It can be used to drive any 4Ω or 8Ω passive speakers.
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LED Chaser Using NE555, CD4017, Infrared Receiver And Photoresistor
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LED Chaser Using NE555, CD4017, Infrared Receiver And Photoresistor
US $9.9514 items soldThe kit does work normally like a normal LED chaser kit. In addition to its obvious features, it has a photoresistor that allows you to change the speed of the chasing LEDs. In the old LED chaser, the speed is controlled with a variable resistor. In this kit, we have used a photoresistor to work as a variable resistor. As the light falling on the photoresistor changes, the speed of the LEDs also changes.
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CD4026- 1 Digit Up Counter Module
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CD4026- 1 Digit Up Counter Module
US $4.9565 items sold- It works as an UP counter. You can instantly test the up count of the display using a flashing LED.
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- Size: 15mmx49mm
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US $14.95151 items soldThis is 3 digits digital object counter kit for electronics beginners and hobbyists. It is the upgraded version of our previous 2 digits and 3 digits object counter.
You can use this 3 digits digital object counter for counting objects or people entering in a room. It can be used by engineers for learning about digital counters.
This DIY digital object counter works with VS1838 infrared receiver and photoresistor and there are three seven segment displays displaying numbers from 0 to 999. An IR transmitter is directed towards the VS1838 infrared receiver of the counter module and objects are moved between the two modules. Each time an object passes between the two modules, the seven-segment displays show increment in numbers from 0 to 999.
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Features:
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- There is a header for HC-SR04 ultrasonic range finder.
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US $19.958 items sold- This is a 74LS192 based up and down counter driver module for driving 2.3″ seven-segment display. The module has headers on two sides to receive up/down count signals and to concatenate with another driver module. You can concatenate unlimited displays.
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2.3″ common cathode seven segment display driver
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US $11.95 – US $12.9522 items soldThis is a CD4026 based up counter driver module for driving 2.3 inches common cathode seven segment display. The module has headers on two sides to receive up count signals and to concatenate with another driver module.
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You can amplify the output of the microphone using this simple circuit too. http://www.electronicsproject.org/microphone-amplifier-circuit-and-description/
can a mic of earphone work similar to electret condensor mic??????…….