Electrical Engineering

Questions tagged [electret]

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A material with a permanent electric charge. Commonly used in the [electret microphone](http://en.wikipedia.org/wiki/Electret_microphone).

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Can I use piezo plate instead of electret mic?

I am doing a project by following the steps mentioned here. It provides me the following circuit: Now, in place of the electret mic can I use a piezo plate? I need to use the same IC, i.e. LM358. ...
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77 views

How can an electret microphone have a more or less flat response?

I've got two concerns. The first is that the voltage across the electret capacitor is proportional to \$\frac{1}{d^2}\$. For the voltage to be proportional to the pressure difference between both ...
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208 views

High pass filter for electret mic to mobile phone

I’m currently working on making a lavalier microphone for use with my phone and gopro camera. I know these types of microphones are readily available and can be purchased fairly cheap, but where would ...
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169 views

Amplify an Electret Microphone using an input Jack 3.5mm

First time on the platform, I will try to be as clear as possible, and electronics is a hobby for me, so I'm open to any welcommed criticism. I'm trying to build a little project, recording the sound ...
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1answer
71 views

Converting a non-electret condenser microphone circuit to electret?

I'm trying to convert an MXL 603s circuit, which has a non-electret capsule, to an electret version. I'm pretty certain that the only real difference between the two would be the fact that the non-...
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2answers
95 views

Feasibility of custom parabolic mic (amplified, bandpass filtered) for use with mobile phone app [closed]

I am not an electrical engineer, but I am up for a challenge and this is my first venture into electrical engineering. However I am beginning to think this may be a step to far! As a hobby I survey ...
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3answers
99 views

Does somebody have a schematic for a stereo electret condenser microphone?

I’m trying to use a Cmoy headphone amp (built around an OPA2227P chip) as a hard-wired in-ear-monitor. I bought a stereo electret condenser microphone from Jaycar this afternoon, but I can’t get any ...
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1answer
385 views

Low noise electret mic circuit

i wanna make a FM microphone for my guitar but the problem is that the electret mic itself output a lot of background noise even before amplifying its signal. so obviously i need a preamp circuit ...
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86 views

Using an active bandpass on a very small signal

I am trying to design a active bandpass filter for an electret microphone (the output will then be read through a microcontroller to control some LEDs) (Image source - Electronics Tutorials) I want ...
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2answers
100 views

Built a electret preamp but poor low frequency response

I have built this preamp using the TL071 IC. It works, but it does have a bad low frequency response. If I plug the mic directly to my PC i can hear low frequencies much better. I don't have any ...
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1answer
217 views

How can i replace a electret mic input with headphone output as input

I'm using a SIM800L GSM module for my project. In this module there is a electret mic input pin but I want to give audio to this module from headphone output from a mobile (There is no line in pin ...
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194 views

Replacing Electret Microphone with Dynamic in Velleman Voice Changer Circuit

I am attempting to build this circuit: https://www.velleman.eu/downloads/0/minikits/manuals/manual_mk171.pdf the MK171 Velleman voice changer, but with a 1/4"mic socket for a dynamic mic instead of ...
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132 views

Connecting Electret Mic to MT8870 Decoder Module

I'd like to connect the audio output of an Electret Microphone to the audio input of an MT8870 decoder module, which uses a 3.5mm stereo cable. I plan to power the mic at GND and VCC pins and connect ...
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1answer
109 views

Can I add an audio jack to a digital audio board?

Can I use the preamplified audio signal on an iphone only microphone (Tascam iM2) to add an audio jack? There is already a USB 5V input which perhaps powers the preamp, and a volume control where I ...
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1answer
237 views

Averaging electret microphones' inputs

I have 4 electret microphones for a project, each going to an AC channel. On the general case each mic has to be processed individually but in one particular case, I would like to have an image of a ...
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195 views

Dual antiphase electret mic preamp topology

I am currently trying to make a preamp for an electret mic pair, which are placed physically in antiphase. The main idea is to subtract one mic's signal from another and therefore boost the signal ...
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1answer
963 views

Can I connect multiple electret microphones for better gain?

Is it possible to connect multiple electret microphones in order to increase sensitivity (gain) of the microphone(s)? If yes, how do I connect them? Update: Obviously one solution is to increase the ...
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3k views

How to get audio from a sensor for an Arduino [closed]

I am working on an Arduino project that requires recording sound that is playing and flashing LED strips to go with whatever is playing in the air. Currently I am using a sensor called the KY-038 but ...
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1answer
573 views

Electret microphone - How to Reduce sensitivity

I am doing a classic LED - sound reactive project. The only thing that is bothering me is that my electret microphone (MAX4466 from adafruit) is clipping, and it is because the maximum gain of this ...
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1answer
132 views

Rating loudness level with electret microphone

I would like to build a loudness sensor with an analogue output. It should provide an relatively stable DC voltage which draw conclusions about the loudness level. Therefor I use an electret ...
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499 views

Increase electret microphone bias voltage

I've got a Zalman zm-mic1 microphone, that was working just fine on my laptop. I bought a new rig a couple of months ago and the microphone is really quiet, digital amplification introduces an ...
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1answer
42 views

Is it worth modding an external audio jack to a camcorder? [closed]

I have a good HD camcorder that records low fidelity audio. Instead of buying a new camcorder, I am tempted to try some external microphones on it, because the electret microphone wires are only 2 ...
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2answers
599 views

Electret microphone amplifier for computer using transistor

I'm trying to make a electret microphone amplifier using transistor to connect on my computer using a P2 connector, the problem is that using the amplifier the sound actually is lower than connecting ...
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2answers
301 views

Building an electret microphone amplification circuit, it's not working

Here's the schematics: The circuit is powered by a 9V battery. There is a voltage divider that gives 4.5V between R4 and R5, this voltage is applied to the negative pole of the electret microphone (...
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1answer
829 views

Phantom Power Circuit Comparison?

I'm going to connect an electret mic (WM-61A) to my computer's "mic in", and am very confused on the reasoning behind a couple different diagrams/schematics that could possibly be used to do this with....
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728 views

Speaker noise from preamp circuit

I am testing a simple circuit in which an electret mic is hooked up to two transistor preamps, then to an 8ohm speaker. I am using a 9v battery, and the circuit looks like this. This circuit is meant ...
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4answers
2k views

Microphone mute anti-pop circuit works but still picks up a little audio

I built a simple microphone mute circuit that appears to be pretty common. It mutes the mic without making a popping sound by shorting the connection through a capacitor. It works pretty well, but if ...
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3answers
7k views

How to hook Raspberry Pi with Electret Microphone to detect sound levels in dB?

I have to detect sounds levels in an enclosed area, so I thought this could be the right choice. /*EDIT I wish to collect sounds levels of about 30-60dB, normally human conversations or just ...
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2answers
891 views

Clap on Clap Off Switch

I would like to ask why the switching component of this circuit (Q1 with the condenser electret mic) works? From what I understand, the mic has to be supplied a voltage for it to operate. Hence, ...
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1answer
292 views

Electret Microphone Operation

In using an electret mic, I understand that you need to supply it some voltage for it to operate, and that you connect a coupling capacitor at its output to remove the DC biasing component of the ...
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2answers
884 views

How do I determine blocking capacitor and bias resistor values for an Electret Microphone?

How in general does one select blocking capacitors and load resistors for an electret mic? Can the effect of incorrect values be observed on a common scope or are the voltages just too small? Why? I'...
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455 views

Is Electret Mic a reliable component to measure Sound Intensity Level (Decibel)

I am working on a project where I am using a Arduino Nano to count number of Loud Sound (occurring at intervals) with intensity between 65 dB - 100 dB. I want to put a calibration unit and a digital ...
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1answer
779 views

Amplified electret mic gives a lot of low frequency noise

I am trying to build a circuit that amplifies an electret microphone. I have made it based of a youtube video. The microphone sort of works at this point, however there is huge amounts of noise ...
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672 views

What is the easiest way to filter engine and wind noise while keeping useful frequencies and speech? [closed]

I have a noisy car. The engine is not a real issue, the wind noise increases quickly with speed, even at allowed highway speed. I have some around-ear headphones with good sound insulation but I don'...
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2answers
131 views

Clap relay using 555timer - not sure about voltages around transistor

Hello! I am working on a clap relay project and I want to do my own clap relay using timer 555 but I am not sure how the circuit works in details. I am familiar with the 555 timer and I know that the ...
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2answers
347 views

Designing of an audio amplifier using LM386 and a preamplifier

This is the circuit . But i am still getting acoustic howling. What can I do to prevent it dynamically. Also I want to increase the sensitivity to the extent that when I rub my fingers in front of the ...
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1answer
2k views

how to differentiate the gnd audio to gnd of battery?

i'm new to the forum. I have some problem to Connect this device with one single battery. I think the problem is on the connection of the max4466 electret. It has a common ground and it make me ...
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1answer
567 views

Getting opposite expected voltage with electret microphone

I am trying to build an electret microphone amplifier circuit run from a 9V battery. The mic doesn't have a part number on it, so I have been making assumptions based on similar datasheets. Most ...
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2answers
710 views

Electret microphone amplifier voltage spikes

I am using this electret microphone amplifier in my circuit I'm getting voltage spikes at the amplifier output that are randomly happening every 2-5 seconds. After shorting the microphone leads, ...
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3answers
7k views

transistor mic preamp

Hi I built this mic preamp circuit for use with an electret mic. The mic I have is this PUI AOM4544 electret mic I have plugged this mic preamp circuit to my soundcard line in. But I think the gain ...
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4answers
967 views

Convert Electret Microphone output to digital data for transmition

I might be asking a stupid question but.... I was wondering about whether or not there is a circuit to convert the output of an electret microphone to 1s and 0s for transmission. And then we can use ...
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1answer
665 views

Electret microphone into iMac 3.5mm TRRS headphone jack amplification

I have this electret microphone: http://www.farnell.com/datasheets/1505849.pdf And I've put it onto a 3.5mm TRRS (4 pole) jack to go into the iMac headphone jack. For the iMac to recognise/accept the ...
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1answer
2k views

SG electret microphone static impedance

I have an SG electret microphone (see figure below) connected to my phone, and it produces pretty bad signals (keeps mostly the low frequencies while killing the high frequencies). I suspect it is the ...
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1answer
264 views

Noise spike on microphone amplification circuit

I'm trying to build an electret mic amplification circuit. I see some weird spikes by just connecting the microphone like so: ...
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1answer
586 views

How to analyse the circuit performance of an electret microphone

I have a simple circuit that amplifies the output of an electret to drive a simple volume visualisation with an array of LEDs. I didn't design the circuit (though I did build it - works fine), but ...
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1answer
7k views

Do electret microphones have polarity?

So do electret mics have polarity? The following circuits seem to contradict each other... 1) 2) Now the problem is one image shows polarity while the other one does not!! What's the holdup here?
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2answers
1k views

Electret microphone amplifier - Terrible low frequency response

I have tried to design a amplifier for an electret condeser microphone. It is basically just a common emitter NPN amplifier. The problem is the frequency response of the real circuit. I get the ...
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2answers
2k views

5v Electret microphone to PC mute switch pop help

I've got a PC microphone that fires off a loud pop when muted. Upon taking it apart it appears that its mute circuit is really simple and therein may lie the issue. I've combed this board for fixes ...
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1answer
1k views

Changed Op-amp, now signal is not centered

I'm making a pre-amplifier for my 9mm electret microphone to be read by an Arduino. Here's the schematic: Note that the resistor I used connected to the output is 1Meg. My supply voltage is 5V. ...
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1answer
546 views

How does a consumer microphone achieve a sensitivity of -20 dB?

How does a consumer microphone achieve a sensitivity of -20 dB (Edutige EIM-001), when one of the best industrial electret microphones I could find (Primo EM158) has a sensitivity of only -32dB (1 kHz ...

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