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Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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imx6q sabre board microphone

I have been trying to record audio using the circuit below. It is different from the normal microphone circuit in that the MIC_IN and MICBIAS are separate paths. I tried to connect an electret ...
Eugene's user avatar
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3 votes
1 answer
577 views

Need help identifying the 4 microphone wires in my laptop webcam

I am trying to adapt my laptop's webcam into a USB webcam. Although I couldn't find any schematics online, the manufacturer did print (I assume) labels to identify the 8 wires coming out of the webcam....
Frank's user avatar
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How to represent a microphone using a voltage dependent current source in LTspice?

I am using the following schematic and I'm trying to simulate it in LTspice but I am not sure how to represent the microphone. My instructor said I should use a voltage dependent current source but I ...
BroomHilda's user avatar
3 votes
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Convert 3V unbalanced microphone to 48V phantom balanced

I have the following circuit in an existing product, which has a microphone, power switch, LED indicator, and is powered by 2 AA batteries: simulate this circuit – Schematic created using ...
Eric Lindsey's user avatar
2 votes
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379 views

Poor man's oscilloscope - more simple

In our lab we have NI cards and work with -10 to 10V. Oscilloscopes are rare and some mobile and quick-and-dirty solution would be fine for debugging. Therefore the 'poor man's oscilloscopes' that ...
user2305193's user avatar
2 votes
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How to connect Electret Microphone module and OPAMP?

I am trying to build a circuit that gets electret microphone input and maps into 0-1V for utilizing in ADC. The microphone module suggests using such circuitry When I tried that circuit and talked ...
İlker Yapıcı's user avatar
2 votes
0 answers
222 views

How to connect a MEMS Microphone Breakout - INMP401 to a RN-52 bluetooth module?

I intended to use a INMP401 (MEMS MIC) to capture audio and stream it via bluetooth using an RN-52 bluetooth module (RN-52). The RN-52 has inputs for differential +- signals. The INMP outputs ...
AV_Sig2k19's user avatar
2 votes
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528 views

Dual antiphase electret mic preamp topology

I am currently trying to make a preamp for an electret mic pair, which are placed physically in antiphase. The main idea is to subtract one mic's signal from another and therefore boost the signal ...
sx107's user avatar
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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 ...
simone's user avatar
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2 votes
0 answers
2k views

Noise-cancelling headphone concept

Inexpensive noise-cancelling headphones use a single microphone located in a little lump between the plug and the earphones. They seem to work fairly well for ambient noises, but not for handling ...
Alex Shroyer's user avatar
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Electret condenser microphone, LM386 amplification... does size matter?

I've built a motorcycle intercom, of which comprises of two amp units, one for the rider, one for the pillion. Both are powered by a 9v battery each, and the option (using a jumper) to enable boost. ...
Ben Everard's user avatar
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Can I power 3.3V to MEMS mic which is TYP=1.8V?

I am reading this datasheet. I have 3.3V for MCU and running out of space in the PCB area. So I want to avoid adding LDO for 1.8V. In the datasheet, it said ...
thankyounaly's user avatar
1 vote
1 answer
208 views

TRRS headphone and mic swapper

I'd like to create a serial cable link library between two devices called Playdates. They have a TRRS audio jack, and my idea is to use a few cables as shown below to connect each Playdate's audio out ...
dwb's user avatar
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1 vote
1 answer
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Understanding how a digital microphone's output gets stored in DSP memory

I am working with a DSP that takes audio input from a digital microphone. For the sake of this discussion all input sounds are pure sinewaves. The DSP receives microphone data as 24-bit numbers. Let's ...
user13267's user avatar
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Push to talk mic over music

I have an amplified mic and I want to mix it with an mp3 player output. I tried something like this without a relay (just a button with 2 pairs of contacts), but I hear a pop when I press the button (...
Cătălina Sîrbu's user avatar
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194 views

Amplifying electret microphones with wrong bias power

I have an issue. I'm making a device that can switch between two microphones for a two way radio. The microphone that comes with the radio is an electret microphone that gets its plugin/bias power ...
Daniël Vegter's user avatar
1 vote
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281 views

Designing of a ribbon microphone (sort of) output transformer

I'm currently working on an experimental string musical instrument. It isn't my invention though. The source of inspiration called Dvina has an unusual pickup system. It senses the current induced in ...
e_asphyx's user avatar
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1 answer
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Frequency decoder circuit microphone not working?

Thank you Vladimir - I have I believe corrected the microphone element of the circuit but it is still not working. I've attached a fresh circuit diagram. I've added an LED to detect when the circuit ...
Arno Hahn's user avatar
1 vote
0 answers
196 views

I2S slave communication without an MCU - how to generate the clocks?

I am designing an audio amplifier circuit which uses an I2S digital MEMS mic (INMP441) for picking up voice signals and an I2S class-D amplifier (MAX98357A) for amplification. I have attached the ...
Sri's user avatar
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0 answers
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CTIA TRRS to 2 x TRS (for laptops): is the mic plug TR shorted together for bias power?

When you connect a (CTIA) mobile headset TRRS plug to a PC with separate green/pink jacks you can find Y-splitters TRRS(F) to 2 x TRS(M). My question: since the PC mic-in(pink jack) expects 3 ...
Anthony Alba's user avatar
1 vote
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72 views

Electret microphone amplifier to control an LED strip

First sorry about my English. So my problem is so simple but I can't figure it out. I have a frequency to voltage circuit which is working perfectly but I want to control it by the voice. https://...
Marcell Fehér's user avatar
1 vote
0 answers
50 views

Building a “if” statement circuit where i can control different light diodes

I want to design a circuit to react in different ways depending if a microphone picks up one frequency and in different way if it picks up the some other frequency. I want different lights to shine ...
Frans Myrberg's user avatar
1 vote
1 answer
171 views

dB SPL Calculation is not making sense- values are seemingly too high

I am using an electret with a sensitivity of -38.44 dBV to make sound measurements at a distance of 1m. I decided to add an amplification circuit with a gain of 125. So in the end to convert to SPL, I ...
Thabiso Msimango's user avatar
1 vote
1 answer
446 views

How to connect microphone mono to stereo power amp

I try to connect mono microphone to stereo power amp like this image. I connect line of microphone to left and right of power amp input and ground of microphone to ground of power amp but it have no ...
user58519's user avatar
  • 111
1 vote
1 answer
168 views

Troubles with mic preamp for headphones with integrated microphone

I am designing a preamp intended to interface with a microphone in common headphones (e.g. apple earpods, or sony headphones with a microphone) which will then connect to my ADC's inputs. I've ...
bcoo's user avatar
  • 11
1 vote
0 answers
863 views

SIM800L microphone problem

I want to feed SIM800L a microphone signal. I found this page in the datasheet and it worked but I need more a sensitive microphone. I want to hear voices in room as much as possible, like a spy bug. ...
yeganehhp's user avatar
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1 vote
0 answers
66 views

NPN condensor mic pre-amp really noisy

I have designed a pre-amp and I am having a lot of noise when silent. It seems to be around 70 Hz on my scope, but jumps around. I've tried adding bypass filters on the NPN emitter legs, as well as ...
Michael's user avatar
  • 15
1 vote
0 answers
206 views

Audio Loopback Dongle Sanity Check

The same circuit as in Explain “Audio Loopback Dongle"; I wanted to know how it worked. Anything I couldn't figure out I found out via CircuitLab's time analysis: simulate this circuit – ...
user19087's user avatar
  • 141
1 vote
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144 views

MEMS Microphone noise floor power level & audio noise spikes measurement

I have a circuit with a MEMS microphone and would like to be able to measure the audio noise spike contents and check the noise floor power level in the audio circuit. My intention is to connect the ...
LazyTurtle's user avatar
1 vote
0 answers
527 views

Can I replace electret microphone with audio connector and expect similar results (sound levels)?

Last night I built a circuit that allows me to obtain sound via a SEED Grove Sound Sensor and input it into my MKR Zero for frequency analysis. It's as simple as this: simulate this circuit – ...
raddevus's user avatar
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1 vote
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461 views

Using an active bandpass on a very small signal

I am trying to design a active bandpass filter for an electret microphone (the output will then be read through a microcontroller to control some LEDs) (Image source - Electronics Tutorials) I want ...
Henry Penton's user avatar
1 vote
0 answers
208 views

Is it possible to build an in-line stereo amplifier for piezo contact mics (stereo pair) with 2.5v plug-in power?

From one idea to the next, here's the back story: I'm currently taking an interest in sound design, and read an article about making sound effects from recording via contact microphones. I already ...
Olly's user avatar
  • 11
1 vote
0 answers
89 views

earphone microphone out put voltage range

I want to send a signal through the 3.5mm jack(microphone port) to an android mobile and process the signal using android mobile application I created. But I don't know the voltage range the ...
RaviSri ThammayyaBabu's user avatar
1 vote
0 answers
903 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 ...
Sander A.'s user avatar
1 vote
0 answers
840 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. ...
swong's user avatar
  • 11
1 vote
0 answers
180 views

Best possible specs for a MEMS mic in 2014?

I want to use the best MEMS mic that's on the market today (June 2014) in terms of audio quality. Since I know that "shopping" questions are forbidden, I'll phrase it like this: What are considered ...
AlcubierreDrive's user avatar
1 vote
0 answers
1k views

Connecting a geophone to Arduino

Simple question: I want to connect my geophone to an Arduino input. The geophone I have is actually output to a microphone jack and I can plug it directly into my computer. I'm pretty sure I can treat ...
Slothario's user avatar
  • 111
0 votes
1 answer
48 views

CB style PTT Mics to USB circuit

I need to design a circuit that takes the input from 2 different CB style (4-pin) push-to-talk microphones and pipes them out to USB. CB mics I have confirmed use regular XLR balanced level output. ...
Muscle Nerd Jerry's user avatar
0 votes
1 answer
67 views

Noise decibel meter - how to convert MAX4466 voltage output to unweighted dB(SPL)

Using this microcontroller with that electret microphone amplifier, I want to build an unweighted dB(SPL) meter as good as it can get - then compare it to this ready made breakout board, this NIOSH ...
Systembolaget's user avatar
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0 answers
24 views

Who is the manufacturer of the Y31 5133 mic?

My question is in this PCBA I need the information of the who is the manufacturers of the mic the full details of that mic...
Naga 's user avatar
0 votes
0 answers
39 views

Why does ESP32-LyraT-Mini V1.2 use an external ADC for the microphone when ADC is already available in Audio Codec?

Kindly refer to ES8311 audio codec datasheet and ESP32-LyraT-Mini V1.2 Schematic.. In the Lyrat mini board, an external ADC ES7243 is used to sample the audio signal from the microphone but an equally ...
hrithik singla's user avatar
0 votes
0 answers
69 views

Why does the ES8374 have 5 pins to receive input from a microphone?

I am using a ES8374 codec for an audio application. I am not able to make out how to connect my analog condenser mic (which has two pins) to the ES8374 mic pins. (Refer to pictures from the datasheet) ...
hrithik singla's user avatar
0 votes
1 answer
108 views

A mini mic speaker circuit

I'm making a mic speaker circuit using max9814 and pam8403. I made the circuit like the picture, but the speaker just makes a long beep and the mic doesn't work. And, i just tried putting the ...
Jjp5045's user avatar
0 votes
1 answer
80 views

Capacitive Switch for a Silent XLR Dynamic Microphone Push-To-Talk Button

I have a few of these TTP223 Capacitive Switch modules. I see tutorials for making a momentary switch out of it by powering it with 5vdc to turn an LED on and off. I also see allot of tutorials for ...
jimj31's user avatar
  • 1
0 votes
0 answers
235 views

Can I connect multiple different devices via a single I2S interface?

I am using a microcontroller with only one I2S interface. I am using MAX98357A which has 1 sound chip. There is 1 microphone, SPH0645. Can I connect these ICs to the same line provided that I cannot ...
FAFİ's user avatar
  • 51
0 votes
1 answer
132 views

What should be preamp gain so output is at line level?

this is the MIC spec: PREAMP I'm planning has a gain of 100: I feel that gain of 100 is too much for a line level output. What should be correct gain? Thanks!
Ariel Narboada's user avatar
0 votes
0 answers
63 views

Convert a 5 pin Elno connector to a 3 pin XLR

I'm trying to modify a Elno laryngophone's connector (5 pin) to plug like a normal mic so I need to understand how to wire cable to a standard XLR connector, maybe somebody knows how to do? thank you
Frank Leaster's user avatar
0 votes
1 answer
74 views

Low bias voltage from headphone jack

I want to connect my microphone capsule (JLI2555) to a headphone jack. I need a voltage to power the capsule from the microphone pin of the headphone jack cable but when I measure it with a voltmeter ...
LEXOR AI's user avatar
  • 346
0 votes
0 answers
113 views

What is the correct sensor to use for capturing ambient noise?

I'm working on a project to capture ambient noise in my room (e.g. coming from the nearby vehicles, birds, etc.) for audio analysis (understand loudness/frequency characteristics). Problem is I'm ...
kovac's user avatar
  • 475
0 votes
1 answer
1k views

Wiring a 2-pin K1 to a 3.5 mm jack with a mic and PTT?

Is there a possibility to wire a 2-pin K1 headset connector to a 3.5 mm jack with a mic and using an external button for PTT in order to close the PTT circuit? If so, please help me, I have been ...
Victor Kallin's user avatar