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Questions tagged [electret]

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

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What are the outputs from my cable?

I am in the process of building a microphone connected to a Raspberry Pi Pico. To check my expectations are correct, I have bought a pre-assembled electret mic and amplifier. The issue I have, is I ...
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Output-Z (electret) higher than Input-Z (preamp)

What happens if an electret microphone capsule (JFET in catridge) is connected to a preamp with considerably lower input impedance than the capsule's output impedance itself? ECM output Z: 2.2K Preamp ...
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Problems with output signal of a 2nd order low pass Sallen Key filter for an electret microphone

I'm having problems with a small circuit based on the amplification of a audio signal received by an electret microphone. It goes to a 2nd order Sallen Key low pass filter circuit with an ...
Zlmanuel87's user avatar
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Why is a transistor amplifier gain less than expected?

I'm trying to build a voltage amplifier using a transistor but am getting a lower gain than I expect. The circuit I have is here: simulate this circuit – Schematic created using CircuitLab ...
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How to convert from datasheet dB value to pressure per volt?

I am trying to measure sound waves using a Raspberry Pi Pico ADC pin but am having trouble converting the sensitivity value on my data sheet into pressure units per volt. I have read a many articles ...
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What determines an electret microphone voltage?

I am trying to get an electret microphone working with my Raspberry Pi Pico's ADC pin. I am trying to detect the output by passing it through a transistor. I have a 4.5V voltage source. I split this ...
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Why does an electret not pick up sound?

I am trying to get an electret mic to detect sound, which I can then pick up using a Raspberry Pi Pico ADC pin. My electret has two output pins. One is connected to ground, the other is connected to ...
user10709800's user avatar
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2 answers
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Removing noise from USB audio CODEC

I've created a USB audio codec using the TI PCM2912A. The feature I use the most is the Audio Sidetone functionality, which plays back audio from the mic so that you can hear yourself talking. I use ...
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Electret microphone to headphone does not work

I would like to make a circuit that takes an electret microphone as an input and the output will be the sound recorded by the microphone with amplification. I've built the circuit with one amplifier (...
arnaudontour's user avatar
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LM386 as pre-amplifier for electret capsule

Although I know the LM386 is intended as a power audio amplifier, I wish to know if it can be used as a pre-amplifier for an electret microphone capsule, as I intend to use it for that purpose. If yes,...
Awais Mushtaq's user avatar
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FET Amplifier Output Distortion

I am new to electronics and still in learning phase. I have made an FET pre-amplifier (using n-Channel JFET) for electret microphone. The output distorts when input signal crosses 200 mV. The top of ...
Awais Mushtaq's user avatar
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Weird noise on a electret amplifier circuit

I'm still a newbie with electronics beyond basic microcontroller stuff, so sorry if the answer's obvious. I have this circuit, just an electret and a simple amplifier stage. I've built it on a ...
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Connecting an electret headset with laptop

I am looking into buying a SmartBoom PRO Dual-Ear Electret Headset Unterminated to connect to my laptop. I work in a very noisy environment and no other microphone seems to work. The following is the ...
QLands's user avatar
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Why does some electrets buzz and others have fantastic SNR on the same pre-amp?

I have a tiny wireless mic preamp which sounds muffled. I swapped it for high quality capsules, they produce crazy amounts of buzzing. I am using short wires and complete foil shielding. The tiny low ...
bandybabboon's user avatar
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Can I use a three-wire electret microphone on a two-wire amplifier?

I swapped a bad two-wire electret for a medium one in a Bluetooth microphone I bought, and I have found a three-wire Tascam electret which has yellow, red, and black wires. Can I connect it to a two-...
bandybabboon's user avatar
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Electret condenser bias voltage

I have an electret condenser from PUI Audio (https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf). The Vs is recommended to be 3V but my circuit and only supply maximum of 2.5V. The ...
Patratacus's user avatar
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How to make an electret condenser microphone work?

This is the schematic. I've tried to build it and it doesn't work. Can someone please tell me where I've got it wrong? The resistor value I used is 470 ohms and the Vsource is 9 volts. The electret ...
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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 ...
Developing Electronics's user avatar
1 vote
1 answer
148 views

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 ...
Alex Hajnal's user avatar
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4 votes
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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 ...
OldProgrammer's user avatar
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1 answer
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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 ...
Royden's user avatar
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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 ...
Jan Riha's user avatar
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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 ...
andreas smith's user avatar
1 vote
1 answer
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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 ...
Compster's user avatar
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1 answer
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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 ...
Erhannis's user avatar
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3 votes
1 answer
465 views

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 ...
Alpha's user avatar
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Need help about electret microphone

I'm using this pre-amplifier 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 ...
Ayush Sinha's user avatar
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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 ...
Thabiso Msimango's user avatar
3 votes
2 answers
1k views

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 ...
fcoppede's user avatar
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1k views

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 ...
treb's user avatar
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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 ...
Richard Long's user avatar
1 vote
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66 views

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 ...
Michael's user avatar
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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 ...
caseyanderson's user avatar
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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 ...
muyustan's user avatar
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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 ...
A.Davies's user avatar
2 votes
1 answer
1k views

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 ...
Stefan's user avatar
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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 ...
Inigo Selwood's user avatar
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2 answers
113 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 ...
Electronically disadvantaged's user avatar
4 votes
1 answer
651 views

(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 ...
Tashfi Nowroz's user avatar
1 vote
2 answers
383 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. ...
Aniruddha Sarkar's user avatar
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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 ...
Jonas Daverio's user avatar
2 votes
3 answers
2k 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 ...
Florida Stunters's user avatar
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3 answers
4k 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 ...
Pymous's user avatar
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1 answer
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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-...
Jack Ritter's user avatar
2 votes
2 answers
231 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 ...
Old Col's user avatar
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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 ...
Muzzlitebeer's user avatar
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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 ...
Mohammad mohammadi's user avatar