A sensor converting an acoustic signal into an electric one.

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4
votes
1answer
230 views

Low-noise amplification of microphone signals, tubes or chips?

When trying to capture faint acoustic phenomena, are vacuum tube amplification designs superior to ICs? In this type of application sensitivity and low-noise amplification are the desired objectives. ...
0
votes
3answers
43 views

Is it possible to directly interface a MEMS ADMP541 microphone over I2S with any Microcontroller?

I have bought a MEMS ADMP541 Evalution kit to record voice samples with arduino controller MEMS microphone will produce digital o/p , I2S communication protocal My question is should I directly ...
2
votes
1answer
86 views

Mic preamp, fixing noise and gain issues

I'm trying to fix a preamp (made by a colleague) that's noisy and somehow not amplifying enough. I should say right away that this project is pushing the edge of my electronics knowledge so I have a ...
3
votes
4answers
66 views

Humbucker-style microphone interference cancelling

For a recent experiment, I decided that it would be a good idea to try to add some electric guitar distortion effects to my otherwise Classical flute playing. In order to do this, I attached a small ...
0
votes
0answers
28 views

STM32 read PDM data with GPIO

I want to build a microphone array with MP45DT02, which outputs PDM signal. It seems that SPI/I2S is usually used to read PDM data, but my MCU (STM32F407ZGT6) has only 2 I2S's and can only support 4 ...
1
vote
1answer
23 views

How to using a 3.5 mm stereo plug mic with a EM11G LM 386N-1 amplifier

I have built a simple amplifier circuit using a EM11G LM 386N-1 amplifier chip which follows the following design (cap and resister values are slightly different): I connected this mic to the ...
1
vote
1answer
65 views

What is causing a loud static POP when PTT mic is keyed?

Hi folks! I have been investigating this static POP noise problem for a while now, including talking to the sound shop I bought the amp from and consulting with the manufacturer of the amp. I am ...
2
votes
1answer
35 views

Questions about FM Mic Kit Schematic

I'm currently building an FM Microphone kit and I'd like to understand its operation before physically putting it together. The documentation only provides an overview of some aspects and provides no ...
0
votes
1answer
45 views

sallen key butterworth interfacing with arduino Due

I am using this stethoscope circuit I want to give TL072 butterworth filter output to Arduino Due ADC which input is max 3.3 but the supply of the mentioned circuit is split +9-0-(-9) volts. How can ...
0
votes
1answer
43 views

Getting opposite expected voltage with electret microphone

I am trying to build an electret microphone amplifier circuit run from a 9V battery. The mic doesn't have a part number on it, so I have been making assumptions based on similar datasheets. Most ...
0
votes
1answer
32 views

Line Level to Mic Pad Working Randomly With Phones

I'm trying to build my own headphones to mic pad. I want to connect the input of the pad to a phone's headphones conector and the output of the pad to a second phone's mic connector. Both phones ...
1
vote
2answers
115 views

can I understand which way sound comes from?

Is it possible to understand which way sound source is located with using microphones? I was thinking using multiple mikes pointed out different ways and getting db differences to predict direction. ...
0
votes
0answers
34 views

Why does a MEMS microphone have four Ground pins?

I am using this MEMS microphone in my circuit: http://www.invensense.com/wp-content/uploads/2015/02/INMP401.pdf I don't understand the purpose of having four Ground pins! Are they all supposed to be ...
0
votes
0answers
40 views

iPhone mic to measure resistance from touch sensor

I hope somebody can help me with this (newbie-ish) question. I want to use the mic input on my iPhone 6 to measure pressure/touch by connecting a force sensitive resistor to the headphone/mic TRRS ...
0
votes
1answer
49 views

Designing a safe Amplifier to drive Sound Card Mic Input [closed]

I've designed an amplifier to receive ELF-VLF (3hz to 30Khz) signals through a loop antenna and want to connect it to Sound Card mic input to analyze received signal. The problem is that the maximum ...
0
votes
0answers
40 views

How to remove statistical properties and standardize two similar microphones?

I am using two similar microphones for my Active Noise Cancellation project. I need to use the microphone input values in LMS Algorithm,I want to standardize the two microphones, so the iterative ...
3
votes
2answers
76 views

Why is my amplification this little

Ok so in the last couple of days I did a lot of research to get everything to work. What I want to do is make a dB sensor with the Arduino. I made the following circuit: To make the supply voltage ...
-1
votes
1answer
62 views

Microphone amplifier bad frequency response

I'm using this MEMS microphone circuit: and I'm not getting a good frequency response. The microphone's datasheet shows a good flat response from 200 Hz-4 kHz (datasheet:mic datasheet). I played ...
1
vote
2answers
74 views

How to get output voltage of microphone?

I am really confused at this moment. I have the following microphone: http://www.farnell.com/datasheets/1660938.pdf What I want to do is make a actual dB meter with this sensor. So I would net to ...
0
votes
3answers
46 views

Filter of DC does not work?

I have the following simple circuit: I thought that the capacitor under R1 can be used to filter off the offset of the DC, but instead I am still measuring (steady) voltage on the output. Is this ...
1
vote
1answer
57 views

How can I calculate the voltage over a microphone?

I want to make a microphone myself with the Arduino (capsule=microphone): I have bought the following as microphone: As is in the datasheet the microphone operating voltage is between 1.5 and 10 ...
2
votes
2answers
91 views

Is it possible a microphone sounds different when user hold it(or not)?

I am a computer-science student working on a signal processing project on smartphones based on recorded microphone signals. For my project, I need a really "reliable" recorded signal. The system works ...
0
votes
1answer
106 views

Microphone voltage output - is it AC?

Can anyone tell me if the output voltage of a microphone (like the type on a webcam) is an AC voltage? And whatever it is, can it be measured on a standard voltmeter? Thank you.
1
vote
2answers
140 views

Electret microphone amplifier voltage spikes

I am using this electret microphone amplifier in my circuit I'm getting voltage spikes at the amplifier output that are randomly happening every 2-5 seconds. After shorting the microphone leads, ...
0
votes
2answers
116 views

How do I connect this microphone to an ADC?

I have this component http://docs-europe.electrocomponents.com/webdocs/0f2a/0900766b80f2a57c.pdf. It is not clear to me what type of circuit I need to use to amplify the signal from this microphone ...
1
vote
1answer
73 views

Mono over stereo jack with no GND?

I want to connect this microphone amp to my audio interface: Please note the stereo output Jack socket (J1) connections: only the two inner connections are used, leaving open the external one. ...
0
votes
3answers
115 views

Convert Electret Microphone output to digital data for transmition

I might be asking a stupid question but.... I was wondering about whether or not there is a circuit to convert the output of an electret microphone to 1s and 0s for transmission. And then we can use ...
0
votes
1answer
112 views

Echo effect during phone call [closed]

What causes echo effect in telephone lines during phone calls? Does it mean that someone is spying on telephone line or? When I talk with some people, it happens, and with some of them not.
1
vote
1answer
102 views

Why does cable length matter so much when source is high impedance?

My beginner’s electronics book has now started to teach me about microphones, specifically Electret microphones. While searching the web for more info, I stumbled upon an article where the author ...
1
vote
2answers
67 views

Piezo contact mic into iMac - avoid signal spikes

I've wired an external piezo as contact mic to the TRRS 3.5 jack of an iMac and it is working fine - BUT the signal will just randomly stop after hitting the contact mic several times too hard, so I ...
1
vote
1answer
394 views

connecting speaker and mic to GSM SIM 900

I have a gsm module but unfortunately it doesnt have an output for mic and speakers. I need to integrate mic and speaker too. In my GSM module, there are male pins available for ...
0
votes
1answer
156 views

Electret microphone into iMac 3.5mm TRRS headphone jack amplification

I have this electret microphone: http://www.farnell.com/datasheets/1505849.pdf And I've put it onto a 3.5mm TRRS (4 pole) jack to go into the iMac headphone jack. For the iMac to recognise/accept the ...
-1
votes
1answer
69 views

Dynamic Microphone with XLR Phantom power

I designed this schematic after viewing the typical phantom power supply circuit. But i am still not sure that the dynamic microphone will work or not. Please take a look and tell me. I just ...
0
votes
1answer
131 views

microphone to a microcontroller. very simple

I want to take a microphone and send it to a micro controller. I then want that microcontroller to evaluate if the audio is above a set db reading and then send a yes or no single to turn on a light. ...
0
votes
1answer
90 views

Output from amplifier is clipping

I have the following circuit and I want to process the output of the op-amp through an ADC. However, as you can see in the picture the signal is clipping at 1.89 Volts, rather than 3Volts. Why is it ...
0
votes
4answers
146 views

How could I read a digital input (an open/closed switch) from a smartphone without a digitizing board?

I have to read a single digital input signal (a trivial open/closed-circuit push button) and use this signal in an Android application on a smartphone. Of course, I could connect a tiny Arduino-like ...
1
vote
1answer
47 views

In current mobile phones, what are some specific techniques that prevent handling noise (rubbing, jostling) from being picked up by the microphone?

I've noticed that when using my smartphone the vibrations from my actions aren't picked up, or are picked up very faintly by the microphone. I've worked quite a bit with microphones and I know it must ...
1
vote
2answers
677 views

Microphone connection diagram

I am trying to replicate project Jasper of raspberry pi. Currently I am using a USB to audio converter (shown in image below) and a regular PC mic. However the audio reception range is very small. So, ...
0
votes
1answer
212 views

Audio hack: replacing electret mic with phone audio output

I'd like to feed a module with audio output from a phone's jack instead of the mic the board cames with. As I said the board is designed to operate with an electret mic with the following specs: ...
0
votes
2answers
135 views

Microphone amp getting only 1x gain?

I'm trying to build Sparkfun's sound sensor and testing the first stage only. Here's the first stage: If I scope before C2 and at Pin 1, I get the following when I scream at it: where Ch1 is the ...
2
votes
4answers
173 views

JFET in place of digipot for gain control?

I'm hoping to build a sound sensor using this schematic (http://cdn.sparkfun.com/datasheets/Sensors/Sound/sound-detector.pdf) To programmatically adjust the gain, I could use a digipot. My (naive) ...
0
votes
1answer
103 views

SG electret microphone static impedance

I have an SG electret microphone (see figure below) connected to my phone, and it produces pretty bad signals (keeps mostly the low frequencies while killing the high frequencies). I suspect it is the ...
1
vote
0answers
61 views

Analog Microphone Preamplifier

In my design I want to use a quad Operation Amplifier for amplifying the output of an Analog MEMS Microphone before connecting to the CODEC IC. I would also be using the MIC preamplifier circuit for ...
0
votes
2answers
172 views

Aux and Microphone to same input

I have a loudspeaker for my car and I've added an aux cord to the system so that I can play music over it. There is also a microphone attached to it and what I've done is add a 3 way switch between ...
1
vote
1answer
91 views

Noise spike on microphone amplification circuit

I'm trying to build an electret mic amplification circuit. I see some weird spikes by just connecting the microphone like so: ...
2
votes
3answers
404 views

Measure human voice for ambient noise level

I need to develop an ambient noise level to measure the loduness in an office. Sometimes during the day people raise their voice more than they should and a lot of confusion is created. So this device ...
0
votes
2answers
480 views

LM324 Pre-Amp For Mic (to PC) Not Working

I don't have much experience in circuit assembling or designing but I wanted to create a pre-amp for my microphone(Philips SBC MD110 Dynamic Microphone which I directly connect to my PC) to boost the ...
4
votes
2answers
304 views

What is the purpose of the resistor connected across ultrasonic receiver terminals?

I have seen a few circuits where a resistor is connected across the positive and negative (grounded) terminals of an ultrasonic receiver. It seems to "stabilize" the received signal. I have attached ...
0
votes
1answer
51 views

Simulating a microphone with a microcontroller?

I'm trying to use a microcontroller to replace where a microphone would normally be connected (to a radio module) to feed a sine wave into the radio module. I can produce a sine wave (I think) but it ...
1
vote
2answers
251 views

Op-amp non-inverting amplifier with clamping?

I am designing a simple electret microphone amplifier for use with Arduino. My current design is shown below: I was wondering if there was a way to combine the diode clamp (D1 in the schematic) ...