Tagged Questions

Audible vibrations transmitted through air or other medium

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0
votes
0answers
9 views

How can I output sound using my BeagleBone Black without the audio cape?

Is the problem that the analog output doesn't give up to 22kHz, and thus cannot output good quality sound? What capabilities are needed to output sound to a small speaker from an analog output pin, ...
0
votes
0answers
40 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
-1
votes
2answers
46 views

What is the impedance of audio output of cell phones [closed]

What is the impedance of audio output in cell phone. I mean 3.5 jack for headphones. Is that somehow standardized? Do we know ranges among cellphones? Or mp3 players. I haven't found any information ...
1
vote
1answer
40 views

Converting analog stereo to digital stereo

Analog stereo has two channels. One for every speaker. Now, when can sample and convert the two streams of data from analog to digital. But the problem, is what we will have is two streams of digital ...
0
votes
0answers
61 views

Can a PC sound card (realtek) be used to transmit radio signals

If I were to use software such as PureData to generate a 20 KHz sine wave and perform AM on the wave, played it out the line-out on the right channel, with the ground and the left channel sent to a ...
1
vote
1answer
74 views

Why does this circuit oscillate and produce sound?

I've connected an 8-ohm speaker in series with coil. When I apply 5 volts / 500 mA to the combination (coil and speaker), I heard a very high frequency sound (something like whistling). The coil is ...
0
votes
1answer
41 views

Architecture of speaker (drivers) to get an acceptable level with small dimensions

I'm trying for a couple of days now how to get a good volume out of a small speaker. My reference is e.g. an iPhone internal speaker which has a good loudness (up do 100dB) in the higher and middle ...
2
votes
5answers
153 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 ...
0
votes
2answers
51 views

Getting the maximum range of a mic

I've asked yesterday a question about choosing a mic, and I conclude that I need a mic that can "hear" a sound louder than 160SPL , after Googling and reading wikis about mics, I still can't find a ...
-1
votes
2answers
62 views

how to choose a mic and make sure not to overcahrge it [closed]

I'm not sure that's the right forum to ask this question but I'll do it anyway . in my project, I've to listen to different machines using an MEMS mic by fixing the mic directly on the machine , the ...
0
votes
1answer
64 views

What device would be the best for producing the loudest beep possible with the smallest size?

I need to have my device be able to produce sounds of at least two different frequencies, as loud as possible at around 3/5V. So far it seems like the best thing to go for would be a piezo speaker but ...
1
vote
2answers
68 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
127 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 ...
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
68 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
32 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
6k 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
63 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
86 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
103 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
199 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
90 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
120 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
87 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
81 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
134 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
90 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
477 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
96 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 ...
0
votes
0answers
55 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
74 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
36 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
107 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
98 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
570 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
170 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
116 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
114 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
223 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
4k 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
192 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
137 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
165 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
265 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
56 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
2k 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
265 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
1k 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
324 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 ! ;)