Questions tagged [microphone]
A sensor converting an acoustic signal into an electric one.
421
questions
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2answers
123 views
Filters generate output even if they are not connected to any signal and does respond differently to different signal sources
opAmps are fed by +/- 9V.
I have two more filters like this one, in total three filters.
If I use a signal generator as input signal and observe output via an oscilloscope; all those filters give me ...
1
vote
1answer
74 views
Is there a preferable way to amplify the signal from an electret microphone? [duplicate]
I need to amplify the microphone output to some level about 3-4 Vpp without a DC offset. The output voltage will only be sensed (it will pass through a peak detector). So I assume I don't need any ...
0
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1answer
45 views
Electret microphone signal amplification
What will be the output of these electret microphones? To be able to have a 3-4 Volts peak output, what should be the gain approximately?
P.S. : Unfortunately these are not products bought from a ...
0
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1answer
49 views
Electret microphone weird offset problem
Hi I am trying to amplify my output from electrec (analog microphone) with below design. When I used 1uF capacitor it has -300mV offset, so that I changed capacitor to lower value with trial-error ...
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0answers
24 views
Converting camcorder internal microphone to external pluggable via jack
I am trying to convert excellent microphone from sony vx1000 camcorder to external one pluggable via jack.
I removed the microphone and was able to find schematics
I tried connecting jack directly ...
0
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0answers
19 views
Converting camcorder internal microphone to external pluggable via jack
I am trying to convert excellent microphone from sony vx1000 camcorder to external one pluggable via jack.
I removed the microphone and was able to find schematics
I tried connecting jack directly ...
0
votes
0answers
46 views
Adding LED to anti-audio pop circuit
I have built a slight variation of this circuit listed elsewhere on this site:
5v Electret microphone to PC mute switch pop help
I'm using this to add an inline switch to my computer headset - ...
0
votes
1answer
48 views
Cannot connect microphone using audio jack
I have a microphone and a female 3.5 mm audio jack. I want to use the jack to get the signal from the microphone for a project with an arduino. To test if the microphone works or not, I'm trying to ...
2
votes
0answers
57 views
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 ...
0
votes
1answer
99 views
How to record a speaker?
Complete noob here. I don't need a ready to implement solution, pointers on what to read upon and ideas for even simpler projects to gain experience first are perfectly fine.
I'm trying to feed both ...
1
vote
1answer
103 views
How can I make a phantom power mic popless mute switch?
I want to make a phantom power (PP) mic mute switch with an indicator led powered by PP. I already did it based on the following circuit. It works but, with the led included in the circuit, I get a ...
0
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2answers
65 views
3.5mm Push to Talk Switch
I am looking to take a 3.5mm microphone line, insert a press button switch (a foot pedal in my use case) between the headset and the computer. I would like the switch to mute the mic connection when ...
0
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1answer
46 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
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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
87 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
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1answer
157 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
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1answer
108 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
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1answer
33 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
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2answers
78 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
77 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
68 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
94 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
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1answer
39 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
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1answer
54 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
51 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
60 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
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1answer
207 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
137 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
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1answer
63 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
1k 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
44 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 ...
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1answer
78 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
120 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 ...
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1answer
120 views
0
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2answers
81 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
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2answers
120 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
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1answer
83 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
454 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
205 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
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0answers
96 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
506 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
398 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
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3answers
553 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
82 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
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0answers
98 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
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0answers
75 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
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2answers
137 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
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1answer
96 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-...
