Audible vibrations transmitted through air or other medium

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-2
votes
1answer
37 views

Can I use Keyes sound sensor as my laptop microphone? [on hold]

I have this sound sensor. Can I use it as my laptop's microphone? Which pin connects to the mono audio plug?
1
vote
2answers
43 views

What is Sensitivity in an ultrasonic transducer Specification?

So far I understand that Sensitivity of the transducer is defined as the ratio of its electrical output to mechanical input. While going through ultrasonic transducer specs, they have a rated ...
0
votes
2answers
80 views

How can I Improve the quality of an amplifier?

I amplify using LM358 Op-amp and 2 resistors. I played a song on my mobile. The output of the Mobile is the input of my circuit. The output of my circuit is connected to 8 ohm speaker. I hear ...
-6
votes
0answers
50 views

Mysterious Ding ding phenomenon [closed]

https://onedrive.live.com/redir?resid=600E5906D4A094C8!682&authkey=!AH5UsA5bVlMPI7Q&ithint=video%2cmp4 Can you please explain the mysterious sound in the video. I put this question here ...
0
votes
1answer
47 views

Loss of pressure during sound propagation [closed]

I try to understand some things about acoustics and seems that I haven't understood many things. Suppose that the sound pressure at mouth is p_lips and the sound pressure at a microphone that is ...
0
votes
1answer
49 views

Relationship between transducer voltage and sound pressure

I understand that transducers produce a voltage that is approximately proportional to the sound pressure. For a given transducer supplied with 1000mV, how can I work out the sound pressure (Pa) ...
0
votes
1answer
27 views

Convert A weighted voltage output into sound pressure

I have designed an A weighting network circuit. but i cant understand how to convert it's voltage output in to corresponding sound pressure level in dB. So How can I convert these voltage readings ...
29
votes
8answers
5k views

How can “purely” electrical circuits emit sound?

Moving membranes or piezoelectric materials obviously produce sound waves, but how can "purely" electrical circuits such as transformers or DCDC choppers (and others) often have an audible noise? Is ...
0
votes
2answers
41 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?
3
votes
1answer
69 views

Fire pit dancing to music — increasing the voltage from a subwoofer out

I am creating a propane "regulator" which allows the user to connect a speaker output to control a valve (0-10V max:0.185A) which opens more with higher voltage. Here's a video of it operating ...
1
vote
1answer
56 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
93 views

One-shot sound button/trigger for Arduino Sound Player

I've succeeded in making a simple Arduino ATMega328 sound player on my breadboard following this guide. . . http://highlowtech.org/?p=1963 http://playground.arduino.cc/Code/PCMAudio But, here's my ...
-1
votes
1answer
83 views

Strange sound in speakers when the refridgerator goes standby [closed]

I live in a room which has two power sockets and the following devices, as illustrated in this diagram: https://docs.google.com/file/d/0Byu0T6y2SLeENDdvNGVCWHFBWmc/edit All devices look exactly as ...
0
votes
2answers
86 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 ...
0
votes
1answer
83 views

How does sonar locate an object in three dimensional space to output data for imaging?

I'm working on a small learning project where I want to connect sonar back to an android phone over bluetooth. I'm working with an hc- sr04 that a friend gave to me and I'm trying to piece together ...
0
votes
1answer
69 views

Can I connect my Philips sound system to my Samsung tablet? [closed]

I have a Philips SPA 4310/10 Sound System and I want to connect via 3.5mm jack to my 10" Samsung Galaxy Tab 3 P5200 to listen some music. Am I at risk of short-circuiting the tablet? Or will ...
2
votes
2answers
122 views

How Fuzz (audio effect) works?

I am relatively new to the world of guitar pedals, and I have recently (after a few failed attempts) built a successful Bazz Fuss. Although I've successfully built it, I'm not sure how exactly it ...
1
vote
1answer
86 views

See if signal is amplified without an oscilloscope

I'm an electronics newbie, but I've had some experience with oscilloscopes in college lab. However, I need to design and wire a simple circuit that can read values from an electret mic. Since the ...
0
votes
0answers
307 views

Reading sound with BeagleBone Black

I have a BeagleBone Black and I need to compare sound on two different microphones. BeagleBone Black does not have audio input, and I believe the audio cape only has a mono microphone input. Is it ...
0
votes
2answers
65 views

Hardware trigger sound card output [closed]

I would like to trigger the output of a sound card such that the device starts playing at a precise moment in time. Normally the sound card attached to your pc will start playing after it receives a ...
1
vote
1answer
140 views

Barebones, rudimentary audio player [closed]

I'm currently working on the next phase of a top secret art project, which just passed the threshold of the prototype stage. I'm building an electronic project that involves light and sound; the ...
0
votes
0answers
42 views

Aes/Ebu to Analog Converter IC

I will convert AES/EBU to analog, then monitor it and will convert it again to AES/EBU. Do you have any advice to convert AES/EBU to analog IC and analog to AES/EBU IC.
1
vote
2answers
69 views

Switching between two sine waves using analog circuitry

I'm trying to do a project entirely using analog circuitry. The project involves switching between two sine waves at a constant frequency to power a speaker. I am using a Wien-bridge oscillator to ...
0
votes
1answer
30 views

Simple sound pulse (or frequency) to voltage for switch

I am building a tiny project using an android phone -- it simply has to drive a transistor switch on and off. Instead of going down the route of trying to interface to a micro controller via ...
-4
votes
1answer
95 views

how can i make my own sound emiting personal alarm? [closed]

I'm a jewelry designer who wants to create an attack alarm that looks like jewelry. I'm having trouble finding info online about how one works. Is there anyone here who can help me or teach me how to ...
1
vote
0answers
78 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 ...
-5
votes
1answer
44 views

Understanding the concepts of sounds analysis [closed]

I'm trying to understand many concepts behind sound analysis. Here's what I'm trying to understand: What's sound & sound wave? What's sampling and hertz? And how to do sampling? (starting from ...
2
votes
4answers
455 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 ...
1
vote
2answers
136 views

phase shift detection between 2 non-periodic signals

I would like to find the phase shift between two non-periodic signals read from an electret microphone. So what I did so far is the following: read the signals from the mics using an arduino uno ...
1
vote
2answers
105 views

Sound dampening like bose headphones

I'm hearing impaired. I'd like to dampen all the sounds around me filtering out all the stuff I deem unworthy of reaching my ears like the sound of my cars engine, computers fan or the rattling of ...
0
votes
2answers
99 views

Scaling down the sensitivity of an MEMS mic

I'm using an MEMS mic ADMP401, and the datasheet said, that the sensitivity form the chip is -46dbV, my question, how to can the scale it down, mean that I hear only really loud sounds?
1
vote
4answers
204 views

Why use 2 isolated grounds in Mackie 220W Power Supply?

I recently took apart a Mackie 220W power supply for an analog sound board. Much to my surprise I found the following scheme: Earth grounded: 48V -18V 18V Seperate, isolated ground: 12V 5V I am not ...
19
votes
6answers
3k views

Why should I use a logarithmic pot for audio applications?

Just got really curious about it reading this answer from Spehro Pefhany. There Spehro comments that one should use a logarithmic pot for audio applications. So I googled for it. The best I could ...
0
votes
1answer
174 views

How do I source an Audibly noiseless (< 3dBA) power supply?

This is not a shopping question; this is a "what is the best way to solve this problem" question. To power a medium-size project, I'm looking for a 15W/12V board mount power supply, taking mains AC ...
1
vote
1answer
127 views

Simple melody recognition based on a microcontroller [closed]

Is there a way to implement a simple melody recognition using a hobby-level microcontroller board like Arduino or Tiva Launchpad? By "melody" I mean a sequence of 4-5 clear notes, produced by a ...
1
vote
4answers
151 views

How does electricity represent sound?

I understand that AC electricity can travel through wires to represent sound. But, to be honest, I can't find a good explanation of it. Here are my questions: How exactly is this setup? Does voltage ...
7
votes
2answers
231 views

Where have the 8 bit sound chips gone?

I know it's 2014 and you can get an MP3 player and 40 bazillion terabytes on a microscopic chip. But I want to build a 6502 based retro computer and, in a perfect world, I would order up about 200 ...
1
vote
0answers
54 views

How multiple sounds together is sampled and reproduced? [closed]

I searched and understood up to the point that device samples the input at frequent interval and store that digitally and later that can retrieved and recreated that sampled sound. What I am not able ...
1
vote
1answer
1k views

Playing sounds using WTV020SD mini

I'm a beginner when it comes to electronics. So I want to play sounds using my controller and I am using a WT020-SD-16P I connected the module to my microcrontroller like in the picture. and added ...
3
votes
2answers
170 views

What might cause audible noise in an inductive charging system?

I have a pair of Qi-compatible wireless charging pads, and I've noticed that when a device is charging, the pad will emit a quiet but noticeable squeal in a relatively high frequency range. Perhaps ...
2
votes
2answers
880 views

How to convert Volts in dB SPL

I am taking input from an electret mic amplified using LM358 amplifier from my PIC16F877A's ADC unit. I am getting the readings in Volts from the ADC which ranges from 2.5V to 5V. How can I convert ...
2
votes
3answers
258 views

Detect string plucking in electric bass guitar? [closed]

Anyone knows any idea of how can I detect plucking in a string of a guitar with an arduino (possibly using the pickup signal)? Thanks in advance ! ;)
1
vote
1answer
79 views

Synchronising two microcontrollers for LED sequence and piezo speaker

I am making a piano keyboard which has a subsystem that plays a song whilst lighting up the corresponding notes that are to be played. I have used a PICAXE 20M2 microcontroller for the LED sequence ...
3
votes
2answers
288 views

FFT + filtering sound = triggering signal

I'm trying to FFT the live input sound and filter it to have only 350 to 500 HZ. So, my goal is to turn the LED light on only when some sound has frequency between 350-500. I looked at FFT codes, but ...
7
votes
5answers
844 views

Circuit that measures the speed of sound in concrete

I need a circuit to measure the speed of sound in concrete to 1μs or better. This is for a school demonstration where students who study construction will use this circuit to measure the speed of ...
3
votes
1answer
199 views

Why do library book detectors make my headphones buzz?

Whenever I enter or exit a library while wearing headphones (cheaper intra-aural type), I hear loud buzzing as I pass through the book detector gate. I can vaguely speculate at a high level that ...
0
votes
1answer
263 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 ...
1
vote
1answer
152 views

Humming Sound of UPS vs DSP Inverter

I have a APC 1000VA BR Smart UPS.I have noted that the UPS Produces a Humming Sound when running on Battery Power.But my older a normal 500VA UPS(not from APC) seems to produce far lesser humming.The ...
2
votes
1answer
231 views

Amplified 80dBA 40KHz Sound From 3V Square Wave?

How can a loud high-frequency tone be produced from a 3V square wave? Given that: the square wave is 3V and can have a varying frequency (max 4mA) 12VDC high-current supply is available ...
1
vote
1answer
378 views

How to produce a simple beep/sound without using piezo-buzzer

I am designing a fairly simple board where I need to sound a simple chirp/beep every couple of minutes, however, layout space is extremely limited. Therefore, a full-blown piezo buzzer is a no-go; ...