A sensor converting an acoustic signal into an electric one.

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1answer
125 views

What are the purpose of those resistors and capacitors network before the mic jack?

I was looking at M851 motherboard schematic to learn something from these documents and saw an interesting circuit for microphone. look: 1- What are the purpose of those resistors and capacitors ...
1
vote
2answers
54 views

Pre-amplifying an electret mic already in use

I want to remove the DC component and boost to a line in level the mic signal of a regular headset plugged into a mobile phone while still allowing the mic to be used by the phone at the same time: ...
0
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0answers
28 views

Microphone to headphones

I am trying to take 2 microphones and connect them to a 3.5mm headphone jack so I can plug in head phones and listen to what the microphones are picking up, what would be the best way to accomplish ...
-1
votes
1answer
39 views

Headphone OUT to microphone IN for mobile phones

My AIM is to feed audio to mobile phones over MIC IN port. This audio would be coming from Laptop's headset out port. The way i am testing is making call from the test device which is connected to my ...
0
votes
2answers
54 views

Running microphone signal through stereo jack

I've recently mounted a 3.5mm connector onto a walkie talkie, so that I can plug in a headset. It works really well, though I've had the idea that since it's a stereo jack and the singal is mono, I ...
3
votes
3answers
68 views

Speaker out (from laptop) to Mic in (Mobile phones)

My aim is to connect Mobile phone's Mic to Laptop headset out for injecting audio into mobile phone calls. So that Mobile phone calls should get answered automatically and system should play the ...
1
vote
2answers
72 views

Sound pressure to db analog

I'm trying to convert an amplified microphone output (it is from 0-5v, biased at 2.5v) to a linear response that correlates with db SPL. From my research, the output of the microphone directly ...
0
votes
1answer
48 views

How do I check my Electret mic?

I recently soldered an electret mic. I have never soldered before. How do I check whether I have damaged the electret mic? If it was a speaker I could have done continuity check but for a mic I don't ...
0
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0answers
48 views

Looking for a compatible microphone - need advice

I have bought a HIO EMB 1200 HW development board which runs Yocto Linux. I plan to do some audio processing on this board. For that reason, I also had to add the HIO 1240 IO module which provides the ...
1
vote
2answers
82 views

How can i create a mic preamp with variable slew rate? [closed]

How can i create a mic pre amp with variable slew rate that is dialed in with a button and have a wide range from very slow to very fast !
0
votes
2answers
55 views

Low amp/volt relay for microphone switching

Its that time of year when I revisit one of my old projects and try to improve it. Currently I have a small 12v PA system that has a microphone and I've added an 3.5mm auxiliary input to play music ...
1
vote
2answers
41 views

Microphone Capacitor Value

I want to use a CMC-5042PF-AC microphone (datasheet: http://www.cui.com/product/resource/digikeypdf/cmc-5042pf-ac.pdf) to send the type of audio signal a component would expect on an RCA line (line ...
1
vote
1answer
78 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
35 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
49 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 ...
0
votes
0answers
35 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?
0
votes
1answer
56 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
votes
0answers
34 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
48 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
43 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} (...
0
votes
1answer
76 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
votes
1answer
329 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 ...
1
vote
0answers
61 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
98 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
23 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
votes
1answer
83 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
81 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
50 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
105 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
88 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
50 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
94 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
54 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
73 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,...
4
votes
1answer
299 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
votes
3answers
125 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
182 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
122 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 ...
1
vote
1answer
94 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
305 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
51 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
92 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
64 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
51 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
117 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
61 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
83 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 ...
-1
votes
1answer
100 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
125 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
54 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 ...