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Questions tagged [microphone]

A sensor converting an acoustic signal into an electric one.

-4
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0answers
31 views

Best 2n2222a based audio amp schematic for piezo buzzer disk contact microphone for human speech? [on hold]

Could anyone point me to a good, or even awesome circuit schematic using the 2n2222a transistor in an audio amp for a piezo buzzer disk contact microphone? I intend to use it to capture and listen to ...
0
votes
1answer
38 views

Changing microphone's jack to headphone's jack

I was trying to change my microphone's jack into my headphones with mic jack by cutting my microphone's wire and connect it to my headphone jack's wires. But these 4 color coded wires makes me ...
0
votes
1answer
56 views

How to mute microphone in 2-way communication when the speaker is active?

I'm making my own two way intercom for my house. There will be a speaker and microphone above the front door of my house (as well as a camera). When someone rings my doorbell, I get a notification on ...
1
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1answer
124 views

Laser Microphone setup

I am currently constructing a laser microphone using 5mW red laser pointer source based on the idea below, not directly output to a speakers or headphones, but the signals must be fed into computer ...
0
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1answer
37 views

Connecting two electret microphones to computer to record stereo sound

I have two electret microphones. I would like to connect them to my computer to record stereo sound. I've checked a couple videos on YouTube and people there show they connect them "directly": signal ...
0
votes
1answer
34 views

Input offset voltage for microphone circuit

Does anyone know what's the input offset voltage (oscillated 2.5V) to the op-amp in the circuit for? From my understanding, the input offset voltage needs to be extremely small so that output DC ...
0
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0answers
44 views

Protection for excessive audio power to earphone

I made a microphone pre-amplifier like this: (Schematic source) I want to use it as spy system e.g. to hear something very far away, perhaps with a parabolic reflector. How we can reduce or cutoff ...
0
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3answers
64 views

Does somebody have a schematic for a stereo electret condenser microphone?

I’m trying to use a Cmoy headphone amp (built around an OPA2227P chip) as a hard-wired in-ear-monitor. I bought a stereo electret condenser microphone from Jaycar this afternoon, but I can’t get any ...
-1
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0answers
36 views

How does the supplied power work in a standard pc microphone audio jack?

I know every soundcard supplies some voltage through the microphone jack, usually between 2-5V. On the web there is some information saying that on a TRS jack the bias is supplied through the ring and ...
0
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1answer
104 views

Low noise electret mic circuit

i wanna make a FM microphone for my guitar but the problem is that the electret mic itself output a lot of background noise even before amplifying its signal. so obviously i need a preamp circuit ...
1
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0answers
55 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 ...
0
votes
3answers
81 views

What could be a near rail-to-rail opamp with very low voltage for this use?

What could be a near rail-to-rail opamp with very low voltage for this use? LM386 seems to be out of limits for my needs. How do I choose it from datasheets? What values are important (of course ...
0
votes
1answer
73 views

How to find these resistance values in microphone phantom power power supply?

In most phantom power supply schematics or documentation (see for example https://en.wikipedia.org/wiki/Phantom_power#Technical_information), I see: 6.81 kΩ when powered by 48V 1.2 kΩ when powered by ...
2
votes
0answers
43 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 – ...
1
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0answers
49 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 ...
2
votes
1answer
91 views

How to improve this microphone phantom power supply to have better SNR?

I built this power supply for my Schoeps CMT30F vintage microphones: It works, but it's not the best I can expect in terms of SNR. What would do you to ensure the SNR is the best possible? Use 0,1% ...
2
votes
1answer
70 views

Can I test a XLR microphone with a DMM?

I have a microphone with a XLR output and a XLR to PL cable. I don't get from it any signal on my PC. Can I test with a DMM the microphone and the cable in order to locate the problem?
0
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1answer
74 views

Help with design a mic preamp with opamps for PGA and ADC

I want to sample an audio source using an electret microphone and analyze the spectrum of it with a uC. I'm interested in the 100Hz-2.5kHz range, so I calculate with these values when I tried to ...
1
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2answers
76 views

Convert CMOS-level signal to microphone-level (0..3V --> -1..+1V)?

I'm building a microcontroller circuit that feeds its output into a microphone input of an audio recorder. The output is a square wave. (Think old-style 3.5mm Square credit card readers). What can I ...
1
vote
2answers
59 views

Why can mobile microphones handle high noise now?

I'm wondering why mobile microphones can now record just fine in very noisy environments? (like loud rock concerts) when just a few years ago the sound would be cracking so terribly that you could ...
0
votes
1answer
86 views

I need schematic of this simple microphone [closed]

wires inside the microphone were cut and I don't know the correct place of wires to solder them so I need schematic or your explanation to repair this microphone. This microphone contains only four ...
1
vote
1answer
127 views

Convert from line level to mic level, without worsening the sound quality

I have an audio signal coming out from an iPhone which I would like to record in iPad using its mic input. I have tried this with simple resistor divider (and TRS-TRRS connectors), but it seems to ...
0
votes
1answer
94 views

SPW2430 MEMS MIC Taking time in returning to base Voltage

BREAKOUT BOARD SCHEMATICCIRCUIT SCHEMATIC Green probe is for DSO and red probe is for DMM I am trying to create project using ESP 32 with arduino IDE which turns on when a snap is detected. I will ...
0
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0answers
49 views

How to connect mic&speaker signals on different platforms?

I posted a question about carrying a line signal over 10-meter cable to transmit and receive human voice from a handset in a building to a GSM/GPRS modem (Quectel M95F). The main goal is to do a GSM ...
0
votes
0answers
102 views

TRS to Apple TTRS and then lightning connecting to external Mic Summary and Question

Thank you for coming this far. Here's the picture first (the bottom bit's the one that's most important) and if you've just got time to write "1", if one is correct" or "2" if two is correct, I'd ...
1
vote
1answer
41 views

PC microphone isn't outputting any signal into a scope

I have one of those average cheapo computer microphones that connects into the sound card via pink 3.5mm jack. I wanted to find out how much voltage can I expect from it, to get a ballpark value I ...
0
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0answers
22 views

Solution to coefficients for Spherical wave equations

Are there any methods for solving coefficients \$A\$ and \$B\$ for the Spherical wave equation below? \$p(r,\theta, \phi) = \sum\limits_{n=0}^{\infty} \sum\limits_{l=-n}^{n} \Big[A_{nl} h_{n}^{(1)}(...
0
votes
1answer
85 views

Why do I see 0v on electret microphones?

I've got a few electret microphones and I tried to make this circuit: It didn't amplify my sound, it continuously buzzed. Without mic it did same thing. So I probed mic and I saw 0.000v. Also 0mA (...
0
votes
1answer
181 views

Difference between increasing microphone sensitivity and amplifying output signal in software

I am a bit of a newbie to the audio world, so please bear with me. What would be the difference between getting a high sensitivity microphone and using a low/medium sensitivity microphone and using ...
0
votes
0answers
33 views

Microphone sensitivity? (ECM and MEMS)

I am doing microphone project with new materials. There are some questions about ECM and MEMS microphones. I understand that the microphone is composed of a sensor part and a circuit part(ROIC), and ...
0
votes
3answers
109 views

Linking Android phone to motorcycle helmet comm set

I have a little mystery for you... I want to connect my motorcycle helmet communication set to my Android phone, including the push-to-talk (PTT) functionality. This is a simple wired setup, not ...
1
vote
2answers
223 views

Why LME49710 does not perform at least as good as LM358 for audio mic op-amp?

I built a hobby mic op-amp circuit as described here: It gave me a pretty ok result: Now I replaced LM358 with LME49710. The circuit is the same, except from the wiring to the LME49710 pins (LM358 ...
8
votes
3answers
1k views

Does a pickup microphone work in space (vacuum)?

Of course in space there is no sound transmitted via air, so there is no air-borne sound, but there is structure borne sound. This sound can be recorded with a pickup microphone, but do pickup ...
2
votes
3answers
162 views

Best microphone picking up sound within a small room?

I've tried several Electret Condenser Microphones as input to a generic USB audio sound card: MO064202-4 MO064402-4 MO064402-5 All mics work great at close range (about 1 or 2 inches). However, none ...
0
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5answers
237 views

What microphone (sound sensor) that can work with Arduino to detect gunshot?

I am working on a project to detect a very loud sound/Pop(like gunshot).I am using a microcontroller like Arduino. Currently I am using this simple sound sensor. But the issue is, it is very ...
0
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0answers
39 views

Connecting an (Polycom) RJ 9 to Plantronics headphone

Hello I am trying to rewire an RJ-9 phone cable and connect it to headphone jack. I have uploaded the following images to show exactly what i want to do: https://imgur.com/uOt4esa -->I want to know ...
0
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1answer
105 views

How to calculate power used by my microphone?

I want to plug a microphone into my camcorder. The battery from the camcorder will provide the power to both the camcorder and microphone. The specifications for the battery are as follow: capacity = ...
21
votes
5answers
3k views

Normal capacitor vs. audio capacitor

I'm building a power supply for old Schoeps CMT30F microphones. Standard condenser mic are 48V-powered nowadays, but these are 60s/70s Schoeps mic from RadioFrance/ORTF, customized at that time to be -...
0
votes
1answer
207 views

MAX9814 feedback from headphones - normal, or faulty device?

I have a setup similar to this one: amp, 100uF cap leading to headphones, nothing more. Powered from a Pi-Ion battery @3.9V. It had worked fine with MAX4466, but after replacing that with MAX9814, I ...
1
vote
2answers
463 views

PC Headset crosstalk

I had issues with crosstalk (microphone picking up headphones sounds) and thought it was caused by headset. So I removed headset's original cable, put 4 pole female 3.5mm jack on the headset and ...
0
votes
1answer
137 views

What types of signals can a dynamic microphone generate?

And what design generates what type of signal property? For example there are dynamic mics with or without output transformers. Do they differ in the type of signal outputted? Do most dynamics ...
2
votes
3answers
467 views

ESP32 microcontroller generates noise on microphone

I am trying to build a device for monitoring ambient noise in a room. I am using SparkFun ESP32 Thing MCU together with SparkFun Sound Detector(electret mic + opamp LMV324m). Nothing fancy, just read ...
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votes
2answers
292 views

What is the most useful sine wave oscillator circuit? [closed]

I need to obtain two different pure sine wave with frequencies 3kHz and 5kHz. Only allowed components: all type of op-amps, resistor, capacitor, inductors, diode, transistor. Sine waves will be ...
0
votes
2answers
109 views

Working of the LM-358 - microphone circuit

I had this task of converting the output of a microphone's voltage (data-sheet link attached) to a range of 0-5V, as this is the range required for the input to an ADC chip. While I know that op amps ...
0
votes
0answers
158 views

Electret Condenser Microphone working principle

I am trying to make a clap on switch and have the following schematic. The dotted box is the electret condenser microphone. I set this up as the first stage for the amplifier design. I would like to ...
4
votes
3answers
842 views

Disconnected laptop's internal mic, but sound-card is still picking up sound, why?

I have a HP Mini 5103. A security minded friend wanted me to physically disconnect the internal webcam and stereo mic, no problem as both are individually connected to the motherboard via a wire ...
0
votes
1answer
215 views

Can I wire the ouput and Vcc of an electret condenser microphone amplifier and get the same signal out?

So I am using MAX9812 amplifier to build a microphone module, but from the pic you can see it requires 3 wires, vcc, ground and output. I was thinking to wire Vcc with output to get rid of one wire, ...
0
votes
1answer
107 views

Noise sensing microphone in the ANC circuit has three terminals

I am trying to understand ANC practical implementation from a headset in which ANC has been implemented. The microphone which senses the noise has three terminal. I have only seen microphone which has ...
0
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0answers
246 views

Connect microphone with pre-amp to STM32 ADC

I need to record audio with STM32. I've got electret microphone and pre-amp based on MAX9812. This is a schematic from datasheet: How I can connect this pre-amp to the ADC? If I just connect it as-...
0
votes
1answer
105 views

lm318n as noninverting amplifier

I am trying to amplify an audio signal generated by a hydrophone. I am trying to work from this (very general) circuit diagram I have found online and in an electronics textbook I own. simulate this ...