Questions tagged [electret]

A material with a permanent electric charge. Commonly used in the electret microphone.

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Connection of microphones to Stereo Audio Codec

I want to interface two electret microphones with a stereo audio codec. One mic will capture audio from one side of a box and the other one from the opposite side. I want to use TLV320AIC3254 from ...
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Choosing a replacement electret microphone

I'm trying to select a suitable replacement electret microphone for an analog (POTS) phone. The existing electret is completely unmarked so I don't know its part number or parameters. I'm not well ...
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What makes an op-amp good for electret microphone preamp vs other op-amps?

What makes an op-amp good for use in an electret microphone preamp vs other op-amps? Being JFET, current bias, voltage bias, etc? Does an op-amp that requires a negative voltage supply work better or ...
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Electret mic - power source noise

I'm working on a project that requires connecting an electret mic to an STM32 nucleo board. The mic is on a amplifier board with the following specs: MAX4466 microphone breakout board; You can set the ...
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Electret microphone: convert sound to current or resistance?

See this picture (from Wikipedia): The electret microphone consists of a capacitor with a static charge and a JFET. I wonder how the electrical signal relates to the sound signal. I understand that ...
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USB port noise and how to deal with it, or avoid it?

I am designing and testing a DIY microphone. The idea is to amplify an electret mic signal before sending it to a PC's sound card to avoid using digital gain. The circuit just uses 2 opamp OPA2134PA, ...
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I need help with a microphone issue for my aviation headset [closed]

This is my first time asking for help in a forum so I hope I can do it properly. My problem is this: I have an aviation headset with a non working microphone and I would like to try make a microphone ...
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Low noise electret microphone amplifier with automatic gain control

I am looking for a simple solution to design a low noise electret microphone preamplifier with automatic gain control (AGC.) Generally, I need to pick up the sound from a far distance, digitalize it ...
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Using Unidirectional Electret Microphone as Static Pressure Sensor

Hi all posted question on reddit but giving it a shot here too, I've been working on a board that requires a pressure sensor to detect when there is a differential air pressure or not. The board needs ...
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Connecting an electret microphone to an ESP32 via MCP3424

I have a need to use an electret microphone to sense noise level spikes for impact detection. My circuit consists of an ESP32 communicating with an MCP3424 via I2C. The electret micropgone is a CUI ...
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3.5 mm Electret Microphone wiring

I have what I believe to be an electret microphone on a 3.5mm jack. This kind: I also have a socket that provides access to the three lines: Finally, I have several microcontrollers and a heap of ...
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Peak detector and amplifier for electret microphone

I've designed a circuit for detecting peak levels of a electret microphone. I've tested the circuit before manufacturing 100 units and it worked nice. After testing the 100 PCB I've received, only 32 ...
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Help with electret mic

I'm using this preamp circuit for my electret microphone and then feeding the output to A0 analog pin of an arduino uno board. For some reason my serial monitor in the arduino ide shows the output at ...
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dB SPL Calculation is not making sense- values are seemingly too high

I am using an electret with a sensitivity of -38.44 dBV to make sound measurements at a distance of 1m. I decided to add an amplification circuit with a gain of 125. So in the end to convert to SPL, I ...
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2 answers
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Electret microphone preamp is buzzing , weird noise and cannot find a solution

I'm building an electret microphone pre-amp following this application note, the output of the preamp is connected to an LM386 and then to some headphones. So my pre-amp circuit looks like this, where ...
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Condenser microphone + LM386 + Arduino

I found this simple circuit and I set it up with BCM-9767P, LM386N and tried to write out the values I get. The problem is that the values seem to be constant and don't change with the environment ...
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Electret microphone to USB soundcard

I am trying to interface a suite of aviation audio headsets to my PC. The headsets use an electret microphone requiring a voltage bias of 8V - 16V for power. Each headset plugs into its own instance ...
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NPN condensor mic pre-amp really noisy

I have designed a pre-amp and I am having a lot of noise when silent. It seems to be around 70 Hz on my scope, but jumps around. I've tried adding bypass filters on the NPN emitter legs, as well as ...
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TL082 electret preamp and LM386 power amp

I have spent the last few days trying to prototype a TL082 electret mic preamp (based on this schematic). I swapped the TL071 in ...
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Electret microphone signal amplification

What will be the output of these electret microphones? To be able to have a 3-4 Volts peak output, what should be the gain approximately? P.S. : Unfortunately these are not products bought from a ...
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AC-Coupling blocking negative voltage values

This question is about the amplification of an electret microphone signal In this video: https://www.youtube.com/watch?v=SToBPCajwc0&t=615s He is using an AC-Coupling capacitor to block the DC ...
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Electret microphone amplification noise

I am building a circuit that amplifies an electret microphone with the use of an op amp. It does work, but I am getting a lot of noise at the output side of the op amp when I connect it to a pair of ...
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Can multiple looper ICs (ISD1820) share one single electret microphone?

I'm using multiple of these ICs to create a simple audio looper. Can they share the same single electret microphone, or should they each have their own? Multiple ICs may have brief overlap of use of ...
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101 views

LED to electrets in parallel (using sound card bias)

I've tried to add an indicator LED to a couple of electrets I have in parallel, plugged into a soundcard. At the LED I'm only reading 0.45V (I believe the bias is 5V). and obviously the LED isn't ...
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(Electret Microphone) Why is input taken from the capacitor?

Why is the input signal taken from the -ve side of the capacitor? I do understand that the resistor has been added for voltage divider. Is this actually for filtering purposes? Or is the capacitor ...
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172 views

Can I use piezo plate instead of electret mic? [closed]

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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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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3 votes
3 answers
1k 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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3k 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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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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2 votes
2 answers
215 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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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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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 but ...
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247 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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250 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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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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1k 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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280 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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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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1 vote
1 answer
652 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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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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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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1 vote
3 answers
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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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1 vote
2 answers
1k 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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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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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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1 answer
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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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1 vote
3 answers
1k 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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2 answers
404 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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2 votes
1 answer
2k views

Microphone supply 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 ...
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