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Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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vote
2answers
453 views

Boosting a microphone for a noisy, low sensitivity input?

To avoid running into an XY problem, here is the problem I really have: I have a RODE NTG2 microphone, and a Zoom H4n Pro recorder. The NTG2 has an XLR output, balanced, and it operates from either a ...
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1answer
205 views

How do I wire a Shure WL 185 to to iPhone or iPad?

I have this old but very nice mic. Old days I recorded audio to the camera or recorder. Nowadays I record to iPhone so I do not have extra recording device and cameras are action cameras usually ...
3
votes
2answers
479 views

Radically different behavior between ceramic and electrolytic capacitors in electret microphone circuit

I've been trying to set up a microphone circuit for use in an AVR, essentially just to detect levels of noise. I observed some strange behavior in the amplified circuit I set up, so i elected to strip ...
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1answer
948 views

Phantom Power Circuit Comparison?

I'm going to connect an electret mic (WM-61A) to my computer's "mic in", and am very confused on the reasoning behind a couple different diagrams/schematics that could possibly be used to do this with....
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1answer
50 views

microphone terminal determination [closed]

Hello, I am trying to determine what the wires are for my splice microphone audio jack. here is a picture of it split : I did a continuity test to see which part of the jack terminal was connected to ...
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0answers
340 views

Pre-amplifier to drive LM324 Op-Amps

I want use Electret microphone Pre-amplifier described in TI document, with Color light organ. Will the output level of this pre-amp enough to drive LM324 Op-Amps on Color organ? Input signal goes to ...
0
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1answer
690 views

microphone noise cancelation using two mics using AND function

First things first, I will clear up that this question is not about external noise cancellation. Cheap microphone generates unwanted static noise, so i decided to array two microphones and use "AND" ...
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2answers
514 views

using headphones as microphone

I am learning about headphones and microphones and I have 2 questions. I bought a few pairs of headphones from the dollar store and took one pair apart. There is a weak little magnet in the center ...
1
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1answer
888 views

Microphone peak detector circuit no signal response

I have built a peak detector circuit using op-amps/comparators to amplify the signal from an electret microphone, hold the peak signal and create a sharp logic edge when a peak is detected to be sent ...
0
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1answer
492 views

Obtain audio information from mic and play in MATLAB

I am trying to make a basic VoIP implementation and I am stuck obtaining sound samples from the mic and playing the read data on a computer. I tried to sample the voice from the microphone and send it ...
2
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2answers
2k views

Common Source JFET Amplifier

I am trying to build a simple JFET common source amplifier to get about 5-10 times gain for a signal I have coming from a microphone with an amplifier already in it, from ADA Fruit, here I am working ...
5
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4answers
2k views

Microphone mute anti-pop circuit works but still picks up a little audio

I built a simple microphone mute circuit that appears to be pretty common. It mutes the mic without making a popping sound by shorting the connection through a capacitor. It works pretty well, but if ...
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3answers
355 views

Does AC OR DC flow?

I'm reading about transducers and have a related question. Is the audio signal flowing through the voice coil of a loud speaker AC or DC?
1
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1answer
450 views

How to prevent microphone from picking up movement?

I have a MEMS microphone mounted to a PCB in an enclosure. The purpose of the microphone is to detect sound, like someone talking. When I just barely touch the enclosure or move it around, the ...
0
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2answers
711 views

what microphone can recording ultrasound (about 40khz) [closed]

I want to record ultrasound then their processing signal on raspberry pi but I don't know type of microphone that can interface with raspberry to can measure ultrasound ( I using MA40s4s ultrasonic of ...
2
votes
1answer
7k views

Microphone voltage on a 3,5mm PC microphone/headphone jack

I bought one of those cheap cup-anemometers that you can stick into the 3.5mm headphone jack of an iPhone or Android device. I'm assuming it is some sort of pulse generator and that the app uses an ...
1
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0answers
307 views

Switch CB Radio mic with SPST button

I'm a beginner with this type of electronics, but want to try this. I have a CB radio with a 6-pin mic/controller. The pinout looks like this: There is a DPDT switch in the mic that switches ...
0
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2answers
815 views

Impedance matching headphones and carbon microphone adapter

I'm trying to convert a regular pair of headphones (audio technica anc-9) with a electret microphone (headset buddy) to a converter box so I can use that setup as a aviation headset. All the ...
2
votes
1answer
235 views

Self made microphone burns arduino

I'm very new to electrical engineering and I'm trying to read microphone input with arduino nano. I've made a separate microphone module (based on this example) and plugged it into aruino like this: ...
0
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1answer
376 views

Electret microphone: how does it work?

Wikipedia explains that an electret microphone is composed of an electret material and a FET for pre-amplifying the audio signal: What I don't understand is how it is working, as the FET must ...
0
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1answer
465 views

Multimedia switch - audio - MIC bias

I'm using an FSA9485 Multimedia Switch (MMS) for audio recording via USB headset. So far, just noise is recorded...so I'm wondering if the MICBIAS is working correctly. The MMS schematic shows ...
0
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1answer
193 views

Studio Mic --> 3.5mm jack not working

I have created a system to plug my studio mic (MXL 990) into my MacBook's 3.5mm headphone jack that consists of the following system: Mic -> AC Power supply for the mic -> 3-Prong microphone cable to ...
-1
votes
1answer
275 views

How to connect microphone to computer? Pre-amp with galvanic isolation

I have audio card with Hi-Fi input, but it is strictly stereo TRS (not balanced). I have condenser microphone with balanced TRS output. I found that mic output is very low, and I receive too much ...
5
votes
1answer
6k 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
591 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
693 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 ...
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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
430 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. ...
7
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7answers
9k 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
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1answer
309 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
1k 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
1k 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
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2answers
424 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
244 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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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
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2answers
181 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
761 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
795 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
4k 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
200 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
633 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
390 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 ...
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1answer
96 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 ...
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votes
1answer
547 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
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1answer
602 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
577 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
729 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
418 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
14k 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 ...