Tagged Questions

A sensor converting an acoustic signal into an electric one.

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5
votes
0answers
71 views

Digital data coming out of a cell phone headset mic?

I want to connect a sound board / mixing console / whatever-you-prefer-to-call-it to the headset jack of my Motorola Android phone. I know the typical TRRS pinout of Left/Right/Ground/Microphone, and ...
0
votes
1answer
60 views

Displays, camera, speakers, microphones: why after more than 50 years of development do they still need calibration? [closed]

An old question running through my mind: Displays, camera, speakers, microphones: why after more than 50 years of development do they still need calibration? Whatever cheap or high-end material I ...
0
votes
1answer
64 views

Direct interfacing of analog MEMS microphone to microcontroller ADC

I would like to sample the output of an analog MEMS microphone with an ADC embedded in a uC, sampling rate up to 1MHz. I don't care too much about signal quality (as I'm more interested in ambient ...
1
vote
0answers
71 views

Noise-cancelling headphone concept

Inexpensive noise-cancelling headphones use a single microphone located in a little lump between the plug and the earphones. They seem to work fairly well for ambient noises, but not for handling ...
0
votes
1answer
51 views

Decoupling pair of microphones using noisy power source

I currently have a high quality microphone that I am powering from a relatively noisy 8V source, like that shown below. It has a built-in amplifier, and doesn't require any amplification. It just ...
0
votes
0answers
29 views

Mic design: Sound sensing

I will be designing a mic circuit first time. This circuit will feed an ADC and I will do signal processing on the signal. This is not for human consumption so things usually bother our ears probably ...
1
vote
3answers
117 views

Can I use a PC Microphone in a PIC with ADC?

I want to do an FFT on some music, I found an electret board so connect directly to the ADC port, but I was wondering if it's possible to use a normal computer microphone, anyone know a tutorial or ...
2
votes
5answers
145 views

Speakers as microphone

I've seen this following post regarding using the speakers as a microphone: http://skeptics.stackexchange.com/questions/5664/can-a-computer-be-hacked-to-use-a-connected-speaker-as-a-microphone There ...
-4
votes
1answer
71 views

What does those symbols on these wires mean? (USB)

I got this cable while fixing my Microphone (Audio Technica ATR2500-USB). It came from a USB B type connector at the bottom of the mic. Does anyone know what does these symbols on the wire correspond ...
0
votes
2answers
55 views

Electret Microphone recognize music with FFT

Do you think is possible that this Electret Microphone https://www.sparkfun.com/products/9964 plus a DSPIC can recognize music frequencys with a FFT, or the electret only recognize the sound levels?
1
vote
1answer
72 views

Electret microphone filtering

I am coupling an electret microphone to the input of an audio codec which does all the amplification, so all I need is biasing and filtering. I picked up the circuit from a colleague and I'm having ...
1
vote
1answer
85 views

Do smartphones and tablets generally use dynamic or condenser electret mics?

I've heard electret microphones are usually what's in a smartphone, but I've never heard about them. Is it the most common type or is it condenser or dynamic? Or a mixture of the three?
0
votes
0answers
388 views

dB Meter with Arduino and AD8307

I am attempting to construct a decibel meter using an electret mic breakout board (shown below) and an AD8307. If necessary I can use just an electret mic, and not the breakout board. I was ...
2
votes
3answers
222 views

My simple audio amplifier circuit does not work

In previous experiments I've made circuits to transfer sound from electret microphone to a powered speaker. Now I'm doing my first experience with an Op-Amp to make the sound louder and to be able to ...
1
vote
2answers
93 views

How to play a microphone out of a speaker?

So I have a small amplifier that plugs into a 12V source and a standard 3.5mm headphone jack and plays pretty good sound to a 8ohm speaker. I am wondering if I can connect the 3.5mm headphone jack to ...
0
votes
1answer
106 views

Technical name for 3.5mm microphone input and speaker output to headphone with microphone cable? [closed]

I am trying to find a cable online that takes the front jacks on my computer case (speaker out, audio in) and merges them so I can use my headphones that have a built in microphone. What would I ...
0
votes
2answers
109 views

Advice on building a noise sensor

I'm attempting to build a noise sensor that detects loud environmental noise. The idea is that the sensor would be able to detect loud music or a loud television within 30 feet, in order to record a ...
2
votes
4answers
177 views

Beats per minute calculator

Basically I want to create a BPM calculator on an ATMega1284. So I have a mic hooked to the ADC already (with potentiometer). I can probably calculate the BPM by getting samples for a while and ...
0
votes
0answers
69 views

Best possible specs for a MEMS mic in 2014?

I want to use the best MEMS mic that's on the market today (June 2014) in terms of audio quality. Since I know that "shopping" questions are forbidden, I'll phrase it like this: What are considered ...
0
votes
1answer
100 views

Understanding a circuit diagram

I am trying to use an electret mic with beaglebone. Instead of making a preamp, I am using a locally made 'audio board'. This is the instruction slip that came with it : However, I do not ...
1
vote
2answers
148 views

How is this preamp design?

I'm trying to design a preamp for this electret mic. I kind of pieced this schematic up from something I have found on the web. Does that look ok? I'm going to sample the output with an ADC ...
2
votes
0answers
70 views

Electret Mic preamp for sampling and FFT

I'm working on a project in which I want to be able to have some light effects based on the ambient music. I was thinking of sampling a mic and running an FFT, and set effects according to that. Is ...
2
votes
1answer
344 views

Pre-Amplifying Electret Microphone for ADC Input

I have designed a simple circuit that amplifies an electret microphone (this one: https://www.sparkfun.com/products/8635). This amplified signal must be no greater than 3.3V, so I bring down the ...
0
votes
1answer
152 views

Decode an infrared signal with an IR demodulator inside a microphone jack

I was looking at this tutorial about how to decode an infrared signal. One of the posts says For the scoped challenged (like me), a PC microphone jack works great for reverse engineering IR ...
1
vote
0answers
90 views

Connect electret mics to computer [closed]

I'm trying to do cross correlation on the signals arriving at a microphone pair. I do not want to record anything. Before doing this on a development board (like the beaglebone/board), I decided to ...
0
votes
0answers
38 views

Problems sending mic input to IC preamp

I am using the following product: http://datasheets.maximintegrated.com/en/ds/MAX98089EVKIT_TQFN.pdf It is an audio codec eval board with RCA input jacks. They provide software for setting all ...
2
votes
4answers
529 views

Calculating Wavelength of sound using an Arduino

I'm using an Arduino Uno R3. I need to measure the wavelength of sound of a particular (known) frequency. By substituting in the equation: Vsound = Frequency * Wavelength ...I wish to calculate the ...
3
votes
0answers
87 views

Modifying headset's microphone to hear from it? [closed]

Problem? I have a headset with a microphone, like this: Good for you. What do you want? I want to use my headset's microphone as a real microphone. It's already a real microphone, you noob. ...
1
vote
1answer
143 views

Reading analog sensor as a microphone signal (via sound card)

I was thinking and studying on how an analog-digital-converter works and just realised that the sound card of every computer-devices is exactly that one. My question is: how can I read an analog ...
1
vote
2answers
117 views

How does internal capacitance affect an electret microphone?

I'm evaluating two different high sensitivity, low frequency microphones from the same manufacturer. They are the same part with a differing internal capacitor, but I'm not provided an internal ...
1
vote
1answer
68 views

Help Identifying SMD Microphone

I suspect this component to be a SMD microphone made by ST. Unfortunately I could not map the writings on the device to any SMD microphone datasheet issued by ST. Do you have a clue?
0
votes
1answer
95 views

Microphone output resistance, why this value?

I would like to sample the output of a microphone. I am using the following set-up in order to tune the DC offset at the microphone output. simulate this circuit – Schematic created ...
0
votes
1answer
227 views

How to connect a microphone to apply audio signal to electronic circuit?

I am working on a project where we have to design a band pass filter signals in audio frequency range. We have tested the filter design using Signal generator already, and now we want to see if it ...
3
votes
0answers
539 views

Connect microphone to RN-52 Bluetooth module

My goal is to build a bluetooth hands free device, basically a speaker phone, to pair with a mobile phone. I am using the Roving Networks RN-52 Bluetooth Audio module mounted on a breakout board from ...
1
vote
1answer
88 views

How to test a capacitive microphone

How can I test a mini capacitive microphone? I have a mini microphone(something used in telephones) and I want to create a circuit to see how it works? I want to speak to it and see how current or ...
2
votes
1answer
569 views

Electret microphone amplifer for general aviation

I'm attempting to create a converter box that allows the use of a standard electret mic and earphones as a headset for general aviation. The headset is relatively straight forward, just use an audio ...
-1
votes
1answer
63 views

Replacing a built-in microphone?

This question might fall under the "if you have to ask" umbrella, but I have a set of bluetooth headphones that I think would perform a lot better if it was on an arm instead of being built into the ...
1
vote
1answer
124 views

Power a circuit and read output from tablet microphone port

I have a project that I'm currently powering with a AAA battery, providing 1.5v to a simple 555 timer circuit. The output of the circuit goes through a voltage divider into the microphone input of a ...
1
vote
1answer
138 views

Vibration Sensor

I would like to make a vibration sensor but the surface is moving around a lot and the sensor might be displaced due to said movement, friction etc. One way to do this is using a microphone over a ...
2
votes
1answer
58 views

How do I get high-performance guitar microphone going for cheap?

Main question: Can I use a lot of cheap microphones off digikey and combine the signals somehow and will this make it sound like a higher-end mic? How do you shop for a microphone: what specs are ...
0
votes
1answer
81 views

Connect in-built microphone in webcam through USB [closed]

I recently repurposed a webcam from a HP laptop to make it USB webcam. I was able to connect the webcam to USB. It also has an in-built microphone, and I dont know how to make it usable. The webcam ...
2
votes
1answer
164 views

Join the microphone and audio lines from a headset for recording

Question What are the steps required to join the microphone and audio lines from a typical cell phone headset into one line so that the audio can be recorded by a standard voice recorder using the ...
4
votes
1answer
304 views

passive high pass filter to iphone mic jack

I'm attempting to input a heart rate signal into my iPhone via the microphone jack. I need to pass the signal through a passive high-pass filter to remove the DC offset before inputting it in to the ...
1
vote
1answer
158 views

4 pin headset pinout / pushbuttons interface [duplicate]

You all know smartphone headsets. Most of them have a microphone integrated and additional pushbuttons for increasing/decreasing the volume or to pause the current track. I am wondering how this is ...
0
votes
0answers
115 views

iPhone TRRS Circuit Not Working

So basically what I am doing is creating an FSK module that sends data to the iPhone via a 4 pin headphone connector (TRRS). So the FSK audio signal comes from the module, and into the mic pin of the ...
4
votes
1answer
417 views

Electret Microphone Preamp Circuit

The following electret microphone preamp circuit seems to work pretty well. My electret model is a little off because on the bread board R6 needs to be ~33k to get the output at 1/2 supply. Just a ...
2
votes
1answer
278 views

Calculate the appropriate bias voltage (and resistor) of a condenser microphone

I have a condenser microphone that has no any model name or number. As we know condenser microphones need a bias voltage for operation. Some microphones need \$2 V\$[1]. and some need more. As we can ...
0
votes
1answer
127 views

Headset with microphone effect on smartphone battery life

I am building a device that will connect to an Android smartphone 3.5mm jack and was wondering if my device would drain the battery. When checking the current on the microphone line on headset ...
0
votes
1answer
329 views

Detecting location of infrasound noise in a building

I am working in a large office building with a lot of people. Pretty frequently there is a very weak and low frequency noise that is very irritating. Unfortunately, I have found just one other person ...
0
votes
0answers
62 views

What do the numbers in the output a microphone mean?

I have written a code in python that plots the built-in microphone's output (at the sample rate 44,100). I see that the output is an array of numbers. What do these numbers mean. My guess is that they ...