A sensor converting an acoustic signal into an electric one.

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1answer
30 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?
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30 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 ...
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0answers
34 views

Connecting Android phone MIC with external speaker

I am trying to generate a sound from my PC and have my Android phone receive this sound through its MIC by the headset plug. I was reading on this topic and this is taken from a web site * To ...
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3answers
92 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 ...
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2answers
70 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 ...
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1answer
62 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 ...
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2answers
68 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 ...
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3answers
73 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 ...
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0answers
56 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 ...
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1answer
79 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 ...
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2answers
107 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 ...
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0answers
39 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
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1answer
145 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 ...
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1answer
109 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 ...
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0answers
62 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 ...
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0answers
35 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 ...
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4answers
390 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
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0answers
65 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
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1answer
85 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 ...
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2answers
75 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 ...
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1answer
62 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?
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1answer
84 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 ...
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1answer
180 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
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0answers
359 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 ...
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1answer
78 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
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1answer
346 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 ...
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1answer
58 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 ...
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1answer
99 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 ...
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1answer
107 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
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1answer
56 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 ...
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1answer
63 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
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1answer
117 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 ...
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0answers
222 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 ...
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1answer
124 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 ...
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0answers
104 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
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1answer
324 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
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1answer
179 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 ...
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1answer
113 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 ...
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1answer
213 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 ...
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0answers
59 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 ...
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2answers
227 views

Boost converter noise

I'm trying to prototype a hobby project on a breadbaord. I'm using an electret microphone + opamp to feed MCU ADC with audio signal. When I'm using a regulated power supply I get good signal with ...
4
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3answers
2k views

simple microphone - speaker circuit

This is my first time creating a circuit, so forgive my poor understanding. I am trying to create a simple intercom system with a 9v battery. I have an 8 ohm speaker and a standard microphone: My ...
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0answers
242 views

Connecting a geophone to Arduino

Simple question: I want to connect my geophone to an Arduino input. The geophone I have is actually output to a microphone jack and I can plug it directly into my computer. I'm pretty sure I can treat ...
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votes
1answer
89 views

Micro-controller and microphone minimal current possible

We would like to have an idea about the minimal current consumption that could be achieve. We need to have some microchip mcu, that have a microphone connected to its ADC port, and that is always ...
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2answers
127 views

Mic pre-amp hum

I've designed a very simple microphone pre-amp to use with my headphones. The thing is I get this 100Hz hum in the output. Is it because I should've used a voltage regulator? Here's what the VRipple ...
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1answer
407 views

How can I attach a microphone and speaker to the Arduino GSM shield?

I recently purchased the Arduino GSM shield so that I could build my own low-tech cellphone. Now that I've successfully been able to send and receive text messages, I would like to add the ability to ...
3
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1answer
214 views

Circuit simulator with microphone support

I am working with a circuit that consists of a condenser microphone. The circuit will filter through all sound signals except very sharp high pitch sound. But I cannot find any circuit simulator that ...
4
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2answers
109 views

Why need more aperatures in microphone array?

I am tring to achieve delay sum beamforming with microphone array, for that I bought playstation eye camera which has 4 microphones in it. For locationg the angle of the sound I need to find exact ...
3
votes
3answers
290 views

What do these passive components do in this microphone amplifier circuit?

I have this circuit I built long ago to amplify 2mV signal from speaker and phase shift it by 2.5V. Now the question is, what does C2, C4, R5, and R6 exactly do?
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1answer
64 views

Microphone time delay estimation

I'm trying to estimate the direction of arrival of sound using a microphone array. This requires me to find the delay of the sound signal upon arriving the different microphones. For convenience, I ...