Questions tagged [microphone]
A sensor converting an acoustic signal into an electric one.
409
questions
0
votes
1answer
34 views
Microphone Pre Amp Book? [closed]
I'm wondering if there's a book that discusses resistors, capacitors, inductors, transistors, transformers, impedance, op amps, power supplies, and the general circuitry of a microphone pre amp. Thank ...
0
votes
1answer
38 views
polarised condensor microphone
Sir/Madam,
Kindly explain how is the following equation derived for the polarised condenser microphone?
The output voltage V0 fed from
the microphone to the preamplifier will be
how is it derived?
...
0
votes
2answers
69 views
Why electret microphone with Op Amp circuit cause signal negative half wave to distort
This circuit works quite well with low signal levels, but when the RMS ac signal is appr. 0.8 to 1.0 V (measured on pin #1 of the opamp), the negative half wave of sinusoidal signal is distorted so ...
1
vote
1answer
62 views
Adapting two-way radio tactical throat mic (laryngophone) to cell phone or laptop
I've ordered one of these: https://www.amazon.com/gp/product/B074Z1LDY2/, a tactical throat mic (and earpiece speaker) which is intended to be used with Kenwood two-way radios (and other compatible ...
1
vote
1answer
91 views
ADC distortion when writing to microSD
I am doing my own project making a basic audio recording device using microcontroller's ADC to get the audio signal from electret microphone and saving data to microSD card. I'm using STM32L476RG ...
0
votes
1answer
27 views
Can i bypass the builtin rectifier and directly supply dc to my microphone preamp and reverb board
I currently have this mic preamp and reverb board that accepts 12-0-12 ac:
original
I have a 24v 10a switching supply and i found a way to create a 12-0-12 dc using this tutorial on youtube
Would ...
0
votes
2answers
70 views
Electric current in mic
For a typical mic a singer uses in a concert, how much current is generated when the singer sings? The current transmitted from the diaphragm into the wire.
What does the following specification tell ...
2
votes
0answers
52 views
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 ...
0
votes
0answers
57 views
extracting DC from audio signal for biasing
I've been wondering if there is a simple means of extracting a DC signal from an AC+DC signal for the purpose of providing a small DC supply to a CMOS device.
Essentially the signal I'm considering ...
4
votes
1answer
87 views
(Electret Microphone) Why is input taken from the capacitor?
Why is the input signal taken from the -ve side of the capacitor? I do understand that the resistor has been added for voltage divider.
Is this actually for filtering purposes? Or is the capacitor ...
0
votes
1answer
37 views
Car microphone; very low signal
I would like to use a car microphone for bluetooth communication.
The mic is a BMW one: 84316938762.
The wiring diagram (TIS) marks the mic's two connectors for the pin 1 and 2: TIS (X18507).
...
0
votes
1answer
53 views
How can I attach a USB microphone to a Breakout-board using ADC Ports? [closed]
I am almost a total noobie to electrical engineering and I bought a programmable Drone called "PlutoX" from here.
I am currently trying to attach a USB microphone like this:
to the so called "X-...
0
votes
1answer
47 views
Bad background noise in audio capture [closed]
I have a microphone attached to a Realtek ALC5640. The circuitry is as below:
L9 is Murata BLM15PD121SN1D
The noise capture is here.
How could I improve the situation and reduce this noise, if ...
2
votes
1answer
46 views
LM567 or Custom bandpass filter
I'm using a array of hydrophones to localize an underwater pinger (37.5 kHz and 45 kHz) and I'm thinking of using LM567 tone decoder as a frequency filter. The other option is to design a custom ...
0
votes
1answer
111 views
Motorola telephone-style handset audio to 3.5mm jack
I retrieved a Motorola Telephone-Style handset wich was in service with a Motorola radio GM380. It is the same as https://shop.motorolasolutions.com/rln4756-telephone-style-handset/product/RLN4756A ...
4
votes
1answer
116 views
Why an 8kHz notch on the headset mic input of a Qualcomm WCD9330?
I have here a smartphone which uses a Qualcomm WCD9330 audio codec IC. (Itʼs a Galaxy Note 4.) Iʼve discovered through testing that the headset microphone input exhibits a roughly 10dB notch in its ...
0
votes
1answer
38 views
Translating mic sensitivity dBV to dBSPL
In mic datasheets, mic sensitivity is usually expressed in dBV that equates to 94 dB SPL (@1kHz).
So if my mic sensitivity -46 dBV equates to 94 dB SPL, does that mean that if I double the signal by ...
8
votes
3answers
949 views
Why is the collector feedback bias popular in electret-mic preamp circuits?
I got some simple electret microphone modules and I've been experimenting with audio amplifiers. I googled to find some example circuits, and I found that most of them resemble the circuit above. I ...
0
votes
1answer
42 views
SMT electret microhone PCB mounting [closed]
I see a lot of SMT microphones in vendors' lineups. All of them orient normal to the PCB--either up or down. I'm working on a design where the microphone has to point parallel to the PCB.
On the ...
1
vote
1answer
51 views
Electret microphone - connect to Codec
I'm new to audio and I want to ensure if it's proper circuit for integrate MAX9860 codec and EMG-610P microphone?
EMG-610P details:
https://www.monacor.com/media/FLE/EMG610P.pdf
MAX9860:
https://...
0
votes
1answer
96 views
What's the purpose of the inductor in this microphone biasing schematic?
I'm just wondering what's the purpose of the inductor in this microphone biasing schematic?
Could it be that I have very low input signal from the microphone because of missing L1? Bias generator ...
10
votes
2answers
2k views
Using a microphone from the 1930s
I have an old Braun Cosmophon BMF2020 microphone at home, which I have long been wanting to use for good ol' fun.
I have virtually no technical knowledge, so I am completely uncertain how to power ...
1
vote
1answer
104 views
0
votes
2answers
76 views
Simplest option for generating audio tones?
I'm looking for the simplest way to generate audio tones. Something like a square or sine wave, but I want multiple tone options. For example, two quick beeps, one at 440Hz, one at 1Khz. The tones ...
1
vote
2answers
101 views
A question on the meaning and model of microphone impedance
I’m a little perplexed by the circuit model and meaning of a high or low impedance microphone. Here is an example where someone at this page is trying to investigate the effects of low or high mic ...
0
votes
1answer
79 views
How can an electret microphone have a more or less flat response?
I've got two concerns. The first is that the voltage across the electret capacitor is proportional to \$\frac{1}{d^2}\$. For the voltage to be proportional to the pressure difference between both ...
2
votes
2answers
341 views
Device to loopback mic to headphones
I have an issue with my headset. I can’t stand not being able to hear myself speak. I’d like to build a passive device to loopback the mic to the headphones that would be plugged in-line between the ...
1
vote
1answer
191 views
Why is the electrolytic capacitor not polarity sensitive?
The issue
I was making a project in which I had to use a 2.2uF electrolytic capacitor in series with a microphone and weirdly, the circuit works even if I toggle the polarity of the capacitor, that ...
0
votes
1answer
62 views
Can I use 48 V DC power supply to make my own phantom power?
I want to know if I can convert a 48V DC power adapter that I have at home to use it as phantom power for my condenser microphone.
I only want to add some sockets that can support a microphone.
...
0
votes
0answers
89 views
Powering and regulating supply DC voltage for a digital MEMS microphone
I want to use Infineon IM69D120 microphones [1][2] in an array (about eight of them), and I am confused as to how exactly (with which components) should the MEMS microphones be supplied.
I chose USB ...
0
votes
1answer
321 views
Inject 5V bias power (“fake” phantom power) for microphone (ModMic)
I've recently bought a ModMic4 for my PC, but the signal level is very low and have to amplify it quiet a lot digitally, which introduces ton of white noise and I have to use noise supression which ...
3
votes
3answers
292 views
High pass filter for electret mic to mobile phone
I’m currently working on making a lavalier microphone for use with my phone and gopro camera. I know these types of microphones are readily available and can be purchased fairly cheap, but where would ...
0
votes
3answers
352 views
Amplify an Electret Microphone using an input Jack 3.5mm
First time on the platform, I will try to be as clear as possible, and electronics is a hobby for me, so I'm open to any welcommed criticism.
I'm trying to build a little project, recording the sound ...
0
votes
2answers
81 views
Why don't we use analog remote mics?
All remote microphones sends digital samples over the ether. Why no analog remote microphones?
I know that digital signals are less sensitive to noises, but there are several advantages of analog ...
2
votes
0answers
90 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 ...
0
votes
0answers
69 views
Custom microphone amplifier poor high frequency response
I've designed and received a custom MEMS microphone amplifier PCB, but am having issues with poor high frequency response and very low sensitivity/gain. Basically the microphone stops picking up ...
0
votes
2answers
102 views
How can I test a microphone circuit with a test signal
I have a microphone circuit very similar to below but I don't have a mic which is on back order. I would like to test the circuit (and the processing that happens downstream) in the meantime. Is it ...
0
votes
1answer
85 views
Converting a non-electret condenser microphone circuit to electret?
I'm trying to convert an MXL 603s circuit, which has a non-electret capsule, to an electret version. I'm pretty certain that the only real difference between the two would be the fact that the non-...
0
votes
1answer
60 views
Stereo Microphone Output into Mono Input
I'm not at all familiar with microphones, so sorry if this is a very simple issue. I have a Sony XAV-AX1000 headunit in my car and the standard microphone included with the kit. It's very similar to ...
0
votes
1answer
70 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
68 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
vote
1answer
162 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
votes
1answer
151 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
108 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
votes
3answers
121 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 ...
0
votes
1answer
460 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
vote
0answers
71 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
95 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
157 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
161 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 – ...
