Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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1answer
455 views

Electret microphone amplifier with analog MEMS microphone

I'm currently using an INMP401 MEMS microphone breakout board (https://www.sparkfun.com/products/9868) for the purpose of having a microcontroller read and sample the output. Now I also want to listen ...
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1answer
94 views

Using PCM1807 with a microphone

I'm new here and I trying to figure out how to work with an ADC. I've read a lot of stuff and I believe that an AD converter it's "very simple" to use. What I mean: Plug the analog source to one side ...
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1answer
479 views

Interfacing Microphone amplifier with MATLAB A-weighting filter

I am working on a project that essentially would be used to measure the Noise produced by ceiling fans and regulate the speed if the noise interferes with speech levels. For the first phase of this ...
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1answer
713 views

Can Anyone tell me what is the default gain of Electret Microphone Amplifier 4466. I need the gain, to calculate the db SPL value.

I am using the MAX4466 microphone amplifier to calculate the db SPL level of sound. I have obtained the peak to peak amplitude in volts and I know that the microphone sensitivity is -44 db which ...
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1answer
309 views

Piezo film for electronic stethoscope

I'm needing to build an electronic stethoscope. I'm thinking to use this piezo film because I already used a piezo disc (ceramic piezo element I suppose) 25mm large (no idea which producer, eBay ...
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3answers
999 views

Combining two phantom power microphone capsules

I just bought a two channel wireless system for my accordion. It is two separate battery powered transmitters transmitting to a single dual channel receiver. It's good that I can have one microphone ...
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1answer
1k views

How to measure a dc or ac signal using PC as oscilloscope?

I want to measure for ex a battery 0.7V dc using a program like Visual Analyser/Soundtrack Oscilloscope/jDTF/Scope/xoscope. I connect the negative pole of the battery to sleeve and the pozitive to ...
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1answer
91 views

Audio: Microphones and SPL

With a microphone sensitivity of -33dB = 22.4mV/Pa, picking up a conversation (about 60dB SPL), What is the voltage output of the microphone? My concern here is power vs voltage decibel calculations. ...
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3answers
243 views

How to record input from multiple microphones so there is no latency between microphones due to writing to memory

I am going to be doing some beam forming. I understand the concept and plan to record all the data then analyze the signals from multiple microphones to figure out locations of some noises (there will ...
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1answer
74 views

When to process beam forming algorithms?

I am building a system that uses beam forming to locate noises at different spots. All of the spots will be in front of the microphones (180 degree range of spots). My first question is if the beam ...
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1answer
626 views

Reuse a microphone (formerly) wired to the digital “General Purpose Input/Output” of a Realtek sound card?

I recently repurposed an old laptop screen (from a Dell XPS L502x) as external monitor, and then made the built-in webcam work without too much fuss. The camera module also has an embedded microphone,...
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1answer
675 views

Low-noise amplification of microphone signals, tubes or chips?

When trying to capture faint acoustic phenomena, are vacuum tube amplification designs superior to ICs? In this type of application sensitivity and low-noise amplification are the desired objectives. ...
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3answers
2k views

Is it possible to directly interface a MEMS ADMP541 microphone over I2S with any Microcontroller?

I have bought a MEMS ADMP541 Evalution kit to record voice samples with arduino controller MEMS microphone will produce digital o/p , I2S communication protocal My question is should I directly ...
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1answer
4k views

Mic preamp, fixing noise and gain issues

I'm trying to fix a preamp (made by a colleague) that's noisy and somehow not amplifying enough. I should say right away that this project is pushing the edge of my electronics knowledge so I have a ...
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4answers
597 views

Humbucker-style microphone interference cancelling

For a recent experiment, I decided that it would be a good idea to try to add some electric guitar distortion effects to my otherwise Classical flute playing. In order to do this, I attached a small ...
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1answer
950 views

How to using a 3.5 mm stereo plug mic with a EM11G LM 386N-1 amplifier

I have built a simple amplifier circuit using a EM11G LM 386N-1 amplifier chip which follows the following design (cap and resister values are slightly different): I connected this mic to the circuit,...
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1answer
3k views

What is causing a loud static POP when PTT mic is keyed?

Hi folks! I have been investigating this static POP noise problem for a while now, including talking to the sound shop I bought the amp from and consulting with the manufacturer of the amp. I am ...
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1answer
250 views

Questions about FM Mic Kit Schematic

I'm currently building an FM Microphone kit and I'd like to understand its operation before physically putting it together. The documentation only provides an overview of some aspects and provides no ...
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1answer
223 views

sallen key butterworth interfacing with arduino Due

I am using this stethoscope circuit I want to give TL072 butterworth filter output to Arduino Due ADC which input is max 3.3 but the supply of the mentioned circuit is split +9-0-(-9) volts. How can ...
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1answer
625 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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1answer
317 views

Line Level to Mic Pad Working Randomly With Phones

I'm trying to build my own headphones to mic pad. I want to connect the input of the pad to a phone's headphones conector and the output of the pad to a second phone's mic connector. Both phones ...
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2answers
123 views

can I understand which way sound comes from?

Is it possible to understand which way sound source is located with using microphones? I was thinking using multiple mikes pointed out different ways and getting db differences to predict direction. ...
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1answer
129 views

Designing a safe Amplifier to drive Sound Card Mic Input [closed]

I've designed an amplifier to receive ELF-VLF (3hz to 30Khz) signals through a loop antenna and want to connect it to Sound Card mic input to analyze received signal. The problem is that the maximum ...
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2answers
131 views

Why is my amplification this little

Ok so in the last couple of days I did a lot of research to get everything to work. What I want to do is make a dB sensor with the Arduino. I made the following circuit: To make the supply voltage ...
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1answer
497 views

Microphone amplifier bad frequency response

I'm using this MEMS microphone circuit: and I'm not getting a good frequency response. The microphone's datasheet shows a good flat response from 200 Hz-4 kHz (datasheet:mic datasheet). I played ...
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2answers
5k views

How to get output voltage of microphone?

I am really confused at this moment. I have the following microphone: http://www.farnell.com/datasheets/1660938.pdf What I want to do is make a actual dB meter with this sensor. So I would net to ...
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3answers
115 views

Filter of DC does not work?

I have the following simple circuit: I thought that the capacitor under R1 can be used to filter off the offset of the DC, but instead I am still measuring (steady) voltage on the output. Is this ...
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1answer
121 views

How can I calculate the voltage over a microphone?

I want to make a microphone myself with the Arduino (capsule=microphone): I have bought the following as microphone: As is in the datasheet the microphone operating voltage is between 1.5 and 10 ...
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2answers
147 views

Is it possible a microphone sounds different when user hold it(or not)?

I am a computer-science student working on a signal processing project on smartphones based on recorded microphone signals. For my project, I need a really "reliable" recorded signal. The system works ...
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1answer
3k views

Microphone voltage output - is it AC?

Can anyone tell me if the output voltage of a microphone (like the type on a webcam) is an AC voltage? And whatever it is, can it be measured on a standard voltmeter? Thank you.
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2answers
728 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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2answers
2k views

How do I connect this microphone to an ADC?

I have this component http://docs-europe.electrocomponents.com/webdocs/0f2a/0900766b80f2a57c.pdf. It is not clear to me what type of circuit I need to use to amplify the signal from this microphone ...
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1answer
188 views

Mono over stereo jack with no GND?

I want to connect this microphone amp to my audio interface: Please note the stereo output Jack socket (J1) connections: only the two inner connections are used, leaving open the external one. In ...
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4answers
1k views

Convert Electret Microphone output to digital data for transmition [closed]

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
443 views

Echo effect during phone call [closed]

What causes echo effect in telephone lines during phone calls? Does it mean that someone is spying on telephone line or? When I talk with some people, it happens, and with some of them not.
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1answer
287 views

Why does cable length matter so much when source is high impedance?

My beginner’s electronics book has now started to teach me about microphones, specifically Electret microphones. While searching the web for more info, I stumbled upon an article where the author ...
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2answers
303 views

Piezo contact mic into iMac - avoid signal spikes

I've wired an external piezo as contact mic to the TRRS 3.5 jack of an iMac and it is working fine - BUT the signal will just randomly stop after hitting the contact mic several times too hard, so I ...
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1answer
6k views

connecting speaker and mic to GSM SIM 900

I have a gsm module but unfortunately it doesnt have an output for mic and speakers. I need to integrate mic and speaker too. In my GSM module, there are male pins available for ...
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1answer
687 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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2answers
653 views

Dynamic Microphone with XLR Phantom power

I designed this schematic after viewing the typical phantom power supply circuit. But i am still not sure that the dynamic microphone will work or not. Please take a look and tell me. I just ...
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1answer
1k views

microphone to a microcontroller. very simple

I want to take a microphone and send it to a micro controller. I then want that microcontroller to evaluate if the audio is above a set db reading and then send a yes or no single to turn on a light. ...
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1answer
528 views

Output from amplifier is clipping

I have the following circuit and I want to process the output of the op-amp through an ADC. However, as you can see in the picture the signal is clipping at 1.89 Volts, rather than 3Volts. Why is it ...
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4answers
983 views

How could I read a digital input (an open/closed switch) from a smartphone without a digitizing board?

I have to read a single digital input signal (a trivial open/closed-circuit push button) and use this signal in an Android application on a smartphone. Of course, I could connect a tiny Arduino-like ...
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1answer
69 views

In current mobile phones, what are some specific techniques that prevent handling noise (rubbing, jostling) from being picked up by the microphone?

I've noticed that when using my smartphone the vibrations from my actions aren't picked up, or are picked up very faintly by the microphone. I've worked quite a bit with microphones and I know it must ...
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3answers
6k views

Microphone connection diagram

I am trying to replicate project Jasper of raspberry pi. Currently I am using a USB to audio converter (shown in image below) and a regular PC mic. However the audio reception range is very small. So, ...
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1answer
2k views

Audio hack: replacing electret mic with phone audio output

I'd like to feed a module with audio output from a phone's jack instead of the mic the board cames with. As I said the board is designed to operate with an electret mic with the following specs: ...
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2answers
461 views

Microphone amp getting only 1x gain?

I'm trying to build Sparkfun's sound sensor and testing the first stage only. Here's the first stage: If I scope before C2 and at Pin 1, I get the following when I scream at it: where Ch1 is the mic ...
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4answers
469 views

JFET in place of digipot for gain control?

I'm hoping to build a sound sensor using this schematic (http://cdn.sparkfun.com/datasheets/Sensors/Sound/sound-detector.pdf) To programmatically adjust the gain, I could use a digipot. My (naive) ...
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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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2answers
939 views

Aux and Microphone to same input

I have a loudspeaker for my car and I've added an aux cord to the system so that I can play music over it. There is also a microphone attached to it and what I've done is add a 3 way switch between ...