A sensor converting an acoustic signal into an electric one.

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1answer
68 views

Digital filter implementation in C (embedded)

I am a recent grad and my new project at work deals with taking the signal from an electret microphone and getting SPL values for 10 standard frequency bands. The analog amplification/conditioning is ...
-2
votes
1answer
32 views

Solder multiple microphone cables [closed]

so I want to build a program that is going to turn on specific microphones through out the building. But that is not the problem, the problem is that I obviously need multiple microphones to place ...
-2
votes
1answer
40 views

Connecting a bare condenser microphone to a RCA cable

I just bought a condenser microphone for direct PCB placement (i call it a bare microphone), I know it resists based on air vibrations (sound). So how could I connect it's 2 pins to a RCA (red white ...
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0answers
28 views

Are MEMS mics better than ECMs in ultrasound applications?

I am going to build a wideband ultrasound LNA. So I am looking for a large usable bandwidth and good sensitivity. As far as I see MEMS are the best choice currently on the market. Am I wrong?
2
votes
0answers
50 views

How do sound engineers maintain levels in live performances? [migrated]

When I watch videos of live performances, like rock concerts, I notice that when the vocalists use the microphone the distance to the mouth will vary somewhat, sometimes significantly, and I would ...
0
votes
1answer
44 views

Flattening microphone's frequency response

It is typical for a microphone to have a non-flat frequency response like so: Is it typical to flatten the response curve by weighting the signal in frequency domain to get the most accurate ...
0
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0answers
16 views

How to use switch in line-in audio jack connector to (de)activate electret microphone?

I have a megaphone with an electret microphone. The voltage at the microphone is about 3.1V and the microphone has a resistance of about 1 kOhm: I replaced this microphone with a little circuit to ...
1
vote
1answer
25 views

Add line in to electret microphone and mute the microphone when plug is connected

I have a megaphone with an electret microphone. I want to modify the megaphone so that I can optionally conntect a notebook's headphone out to the megaphone. So I want to add a line in connector to ...
0
votes
1answer
36 views

Understanding microphone sensitivity

My goal is to figure out a relation between output voltage and input SPL: $$dB(SPL) = f(V_{out})$$ First, I get the sensitivity in volts from this formula: $$Sensitivity_{dB(V)} = 20 * log_{10} ...
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1answer
61 views

Microphone on Arduino for Sound Detection

I'm working on a design to have a microphone on Arduino board for sound detection (clapping sound etc). I see there are lot of circuits floating on internet but almost everyone has an output to ADC ...
0
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1answer
69 views

Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?

I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy): I have an earphone splitter for iphones that ...
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0answers
55 views

Audio: Camera activated external microphone

I want to build a relay circuit that turns on an external microphone (powered by an internal 9V battery) when a connected camera is turned on (a camera offering only 1V plugin power through a 3.5 mm ...
0
votes
1answer
67 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 ...
1
vote
1answer
22 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 ...
0
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0answers
66 views

USB microphone to UART

I have a USB microphone module which I want to attach to a Texas Instrument CC3200. Image of pins: ...
0
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1answer
67 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 ...
0
votes
1answer
60 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 ...
-6
votes
1answer
46 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 ...
0
votes
3answers
82 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 ...
0
votes
1answer
58 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 ...
3
votes
1answer
45 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. ...
1
vote
3answers
80 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 ...
2
votes
1answer
52 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 ...
0
votes
1answer
61 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 ...
4
votes
1answer
272 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. ...
0
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3answers
84 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 ...
2
votes
1answer
135 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 ...
3
votes
4answers
99 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 ...
0
votes
0answers
89 views

STM32 read PDM data with GPIO

I want to build a microphone array with MP45DT02, which outputs PDM signal. It seems that SPI/I2S is usually used to read PDM data, but my MCU (STM32F407ZGT6) has only 2 I2S's and can only support 4 ...
1
vote
1answer
60 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 ...
1
vote
1answer
185 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 ...
2
votes
1answer
46 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 ...
0
votes
1answer
85 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 ...
0
votes
1answer
53 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 ...
0
votes
1answer
44 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 ...
1
vote
2answers
116 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. ...
0
votes
1answer
53 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 ...
3
votes
2answers
81 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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votes
1answer
82 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 ...
1
vote
2answers
110 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 ...
0
votes
3answers
50 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 ...
1
vote
1answer
61 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 ...
2
votes
2answers
101 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 ...
0
votes
1answer
208 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.
1
vote
2answers
196 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, ...
0
votes
2answers
142 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 ...
1
vote
1answer
84 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. ...
0
votes
3answers
160 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 ...
0
votes
1answer
134 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.
1
vote
1answer
109 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 ...