Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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5
votes
1answer
8k views

Phantom Power supply for Electret mic

Will this circuit work to connect an lapel mic mic (expecting ~2.5v plugin/bias power) to an XLR input providing phantom power (I have a choice of 12 to 48v). I assume the lav mic has a typical ...
2
votes
1answer
734 views

3.5mm audio jack with diy mic

I am interested in hearing the "noise" electronics make thru EMFs. I have a coil of wire, and an audio cable with dual 3.5mm jacks (one on both ends). This cable supports stereo audio (TRS), so how ...
1
vote
1answer
830 views

How do you calculate the required gain for an electret microphone amplifier?

Given that for example I have a -38dB mic such as this one, how can you calculate the gain needed to match the range of the ADC(5v)? I found this page explaining some basics, and some other questions ...
0
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2answers
2k views

Audio Amplifier Circuit using op-amp [closed]

I am designing a circuit to amplify audio from microphone as well as removing dc offset from biasing the microphone. I searched for circuits available online for my personal project. I came across ...
1
vote
0answers
474 views

Choosing resistor/capacitor for wiring microphones

I've been researching how to wire up a electret mic and found this to be very common. I can't seem to find any info on what values should be used. Most people use 1k or 2.2k resistors and 4.7uF caps. ...
8
votes
7answers
10k views

Can a comparator (LM393) be used as an amplifier?

I have seen modules for microphones (such as the one below) that use the LM393 and claim to have amplification. I have looked this part up and it is a comparator. I have read that op amps can be used ...
0
votes
1answer
359 views

Force microphone on TRRS connector without a mic connected

I have a TRRS connector for my Android phone. I want to be able to enable/disable the mic on the cable using a button. So for this I have connected a 1.2 kOhm resistor to a button and when its 'on' ...
1
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4answers
2k views

Amplified microphone signal output to ADC input. How can I eliminate DC offset?

I'm making simple sound level meter. I try to make it precise. I'm using ADC ref voltage (2,048) so rms calculation can be simpler. Can I use this ref voltage to set offset voltage to (Vref/2) and ...
2
votes
1answer
2k views

Will this phantom power circuit work?

I'm designing a musical instrument in which two oscillators (one based on a Quad NAND gate, the other on a 555) are controlled by a signal from a condenser microphone. At the moment the mic is being ...
0
votes
2answers
481 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
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2answers
261 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
votes
1answer
3k 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
215 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
906 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
807 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 ...
1
vote
1answer
5k 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 ...
1
vote
2answers
215 views

How can I create a microphone preamp with a variable slew rate? [closed]

How can I create a microphone preamp with a variable slew rate that is dialed in with a button and have a wide range from very slow to very fast?
0
votes
2answers
675 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
2k 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
413 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
98 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
608 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
1answer
671 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 ...
1
vote
1answer
675 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 ...
1
vote
1answer
801 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
437 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 ...
2
votes
1answer
16k 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 has ...
2
votes
0answers
82 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
476 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
97 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
491 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
815 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
344 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
1k 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
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 ...
2
votes
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. ...
1
vote
3answers
248 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
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 ...
0
votes
1answer
945 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
695 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. ...
1
vote
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 ...
2
votes
1answer
5k 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
674 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 ...
2
votes
1answer
1k 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,...
1
vote
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 ...
2
votes
1answer
281 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
235 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
689 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 ...
2
votes
1answer
374 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
124 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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