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Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

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How can I record with this old fashioned mono microphone? [closed]

I have this microphone that comes with a 3.5mm mono jack connector. When I plug it in to my laptop or my phone it won't work, and I believe the "mono" part is the problem. What do I need to ...
I. Haage's user avatar
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3 votes
2 answers
364 views

How do you choose an audio isolation transformer for a microphone?

I found a few SE Q/A's for audio transformer characterization, but they neither address calculating the impedance match, nor consider signal loss for weak audio sources (like those from a microphone). ...
KJ7LNW's user avatar
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3 votes
2 answers
368 views

What type of cap would you use to block DC on a microphone-level audio line (unbalanced)?

I need to block a DC voltage on a microphone line, and a bit of research shows that MLCC is a bad idea because they can mechanically ring from vibration. Question: What type(s) of capacitor could be ...
KJ7LNW's user avatar
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What is the maximum dBu I can send into a microphone input in this schematic?

The schematic below is from the Icom 9700 radio service manual (page 80). I would like to feed this input from a mixer board's ALT-3/4 outputs, and I want to avoid blowing the TS462 microphone preamp ...
KJ7LNW's user avatar
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1 answer
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Aviation headset amplifier

What type of amplifier is on the market or can I use to get my microphone to work? I am converting a British combat headset to use in an open cockpit airplane. Right now current headsets just don't ...
Stephen's user avatar
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0 answers
21 views

Audio project converting TSH-4 headset to 3.5 mm audio jack

I've been trying to connect this TSH4 headset to a 3.5 mm audio jack. The headset has kind of a weird setup, with Mono audio + and - being the top pins (I don't know which is which, but the polarity ...
Emily Kramer's user avatar
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2 answers
62 views

Digital Microphone Readings to dB SPL

I've seen previous answers on how to calculate the dB SPL based on my I2S readings but I can't come up with a formula to calculate it. I use the MSM261S4030H0 I2S microphone with sensitivity of -26 dB ...
Phaze Music's user avatar
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1 answer
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3.3V regulator and Comparator not working as anticipated

This is my first time designing something like this so excuse my inexperience. My objective here is to create a simple circuit for checking if a particular component is good or has been damaged. From ...
John Lapinski's user avatar
1 vote
1 answer
96 views

How can the microphone senstivity be improved? It works for only a few centimeters

I am using an electret microphone with the preamplifier circuit attached below. The problem is that the microphone works only when I speak very closely to the microphone. If I speak from a distance, ...
Google Pandey's user avatar
0 votes
1 answer
71 views

What voltage comes from a standard 6.3 mm instrument cable?

I am designing an electric percussion instrument using various metal strings and objects that are hit my solenoids. Pickups record the sound.I need to know what kind of voltage and current instrument ...
Crisps's user avatar
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3 answers
206 views

Why doesn't my microphone amplifier work?

I designed a microphone amplifier like in the simulation image below. The images of it in real life are also below. The microphone is a JLI2555. The input voltage used in the simulation is 1mV. When I ...
LEXOR AI's user avatar
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1 answer
60 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
1 vote
2 answers
86 views

Disabling microphone when secondary one is connected

I'd like to add a 3.5 mm female jack to this circuit so that I can add a better external microphone while keeping the internal one for convenience. What would the circuit look like? Putting both ...
Jess's user avatar
  • 11
2 votes
1 answer
108 views

How to connect an external dynamic microphone to your smartphone (Android)

I use Google Translator so there may be errors in the text. I have a problem with connecting a dynamic (not electret) microphone. Dynamic microphones have too low resistance (this one has 200 ohms) ...
m72's user avatar
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1 answer
102 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
1 vote
2 answers
43 views

Sound activated LED

I have some questions about sound activated LED ciurcuits. Q1) How do LEDs turn on and of in this circuit? My answer: "The condenser microphone consists of a capacitor and a resistor. When sound ...
abeloejmn's user avatar
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0 answers
28 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
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0 answers
58 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
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0 answers
72 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
139 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
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1 answer
121 views

Making a mini mic speaker [closed]

I’m making a mic speaker circuit with a PAM8403 amplifier. The performance wasn't good enough; mic sensitivity wasn't good and it didn't really amplify my voice, so I thought about adding a MAX9814 to ...
Jjp5045's user avatar
1 vote
1 answer
107 views

Balance Mic and Speaker for Camera Input with Ground Loop Isolation

Novice looking for some help. I use a Cardo Bluetooth headset to communicate with friends and record the audio onto an action camera while out riding motorcycles. By trial and error I was able to come ...
simi.d's user avatar
  • 13
10 votes
6 answers
2k views

Is there any way to measure sound intensity in decibels without using a microphone?

I am trying to measure sound intensity in decibels without using microphone in a home automation project. Due to privacy concerns, I don't want to use a microphone in the device. Is there any way I ...
Moaz Azam's user avatar
1 vote
2 answers
157 views

Bionic Ear help

I'm trying to build a "bionic ear" (or spy listening device). I want it so I can more easily locate kittens or cats stuck in garages, etc. (I work in cat rescue). I tried to build The Big ...
Art Seek Main's user avatar
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0 answers
45 views

Interfacing mems digital microphone with ESP32 [duplicate]

The datasheet of the microphone mentions: Source termination resistors are used to match the impedance of the source and the trace. The component values of the termination resistors depend on the ...
Moaz Azam's user avatar
0 votes
2 answers
37 views

How can I use a microphone with integrated PA for a level detection purpose?

I have a MEMS microphone with an integrated PA. I'm going to use it as a trigger in a low-power device so I wanted to know if that internal PA is enough and I can connect it directly to the analog ...
Tirdad Sadri Nejad's user avatar
0 votes
1 answer
225 views

Can my smartphone's microphones get damaged by recording loud sounds? [closed]

I recorded some songs with my Android phone from another phone at maximum volume. Will this damage my Android microphones?
Oswald's user avatar
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0 votes
1 answer
158 views

Converting dBV to dBSPL

I am calibrating my microphone system consisting of a microphine whose signal is amplified and then converted from analog to digital with an ADC. The ADC converts the data to a 16-bit integer. The ...
Tom's user avatar
  • 25
0 votes
1 answer
108 views

I2S communication WS line function

I was reading the official I2S documentation from Philips and I have some doubts on its functioning (I'm new to this protocol with respect to PDM). The WS line is used to select either the left or ...
Luca's user avatar
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1 vote
3 answers
242 views

Piezo transducer as both microphone and speaker

I'm trying to find the best piezo transducer for my project, which is a Morse code sender and receiver. Since a piezo transducer can both act as a speaker and a microphone, and I only send/receive at ...
Björn Morén's user avatar
0 votes
1 answer
94 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
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1 vote
1 answer
105 views

Time Domain Normalization of the IMP23ABSU Microphone

I have tried to evaluate the analog microphone (IMP23ABSU) built into the STEVAL-STWINKT1B with the FP-SNS-DATALOG1 (HS-Datalogger). The values were exported as "raw values" (this is an ...
Tom's user avatar
  • 25
0 votes
1 answer
51 views

STM32F407G-DISC1 AUX to Laptop Aux [closed]

I am working with STM32F4 board and signal processing, generating some sin waveforms on CODEC, the problem is that I don't have oscilloscope on me and want to see what waveforms I am generating. I ...
Dominykas's user avatar
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0 votes
1 answer
117 views

Problems with output signal of a 2nd order low pass Sallen Key filter for an electret microphone

I'm having problems with a small circuit based on the amplification of a audio signal received by an electret microphone. It goes to a 2nd order Sallen Key low pass filter circuit with an ...
Zlmanuel87's user avatar
0 votes
2 answers
140 views

Why is voltage from sound card in audio circuit not constant?

I have a JLI2555 microphone capsule connected to a JFET Transistor that is then connected to a sound card that goes into the usb port of my laptop. The idea is that I want to record my voice using the ...
LEXOR AI's user avatar
  • 346
0 votes
4 answers
120 views

Microphone pre-amplifier op-Amp outputs larger voltage when Mic RL is larger

I am following TI's pdf Non-inverting microphone pre-amplifier circuit with AOM-4544P-2-R microphone. I probe the circuit on the Vout after the op-amp, (not on the mic directly). I am playing around ...
Christianidis Vasilis's user avatar
3 votes
1 answer
331 views

Audio Transformer with Center Tap to XLR Cable

I would like to put an isolation transformer at the differential output of MAX4063 chip. This transformer has a center tap. Then at secondary side, outputs will be connected to a 3-pin XLR cable. Is ...
Ariel Narboada's user avatar
3 votes
1 answer
102 views

Can I use a contact microphone to detect a fan running / not running inside an electronic product?

I'm involved in thermal testing of an electronic product which contains a small centrifugal fan. The product is entirely sealed and no signals can be transmitted through the case when it's operating. ...
anon33's user avatar
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0 votes
0 answers
257 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
152 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
2 votes
2 answers
295 views

Squelch Function - microphone preamplier

I would like to add a squelch function to this mic preamp: EDIT: NE5534 pinout per SPICE model Output should only be present when minimum input signal amplitude is reached. If I leave it as it is, ...
Ariel Narboada's user avatar
0 votes
1 answer
103 views

Is there a risk of a DIY pre amp damaging a microphone?

I'm looking for a preamplifier to use with an aquarian A1S hydrophone. This is an application where signal integrity is not very important and we're going to filter and do a fourier transform on the ...
Smitty Flufferson's user avatar
0 votes
1 answer
45 views

Headphone amplifier for Camera without audio jack

I am thinking about a project for my camera. A problem that often occurs with cameras and I haven't found a solution yet is, that there is an external microphone input but no audio output to monitor ...
Moritz Pfennig's user avatar
0 votes
1 answer
147 views

How can I connect an amplifier circuit to microphone input on a laptop?

I have a microphone TRS plug and want to connect it to a USB port on my laptop and the other end to an amplifier with a microphone connected to it. I have bought a soundcard to be able to connect the ...
LEXOR AI's user avatar
  • 346
1 vote
3 answers
111 views

Electret microphone to headphone does not work

I would like to make a circuit that takes an electret microphone as an input and the output will be the sound recorded by the microphone with amplification. I've built the circuit with one amplifier (...
arnaudontour's user avatar
0 votes
0 answers
75 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
1 vote
0 answers
54 views

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
0 votes
1 answer
75 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
121 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
1 vote
1 answer
175 views

How does this microphone preamplifier work?

This preamplifier circuit is designed by Andy Collinson for dynamic microphones. I can't understand how it works. Why is the microphone input connected to the emitter of Q1 instead of the base? ...
ElectronSurf's user avatar
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