The sound tag has no wiki summary.
15
votes
4answers
1k views
Why do high voltage power lines hiss when it's raining?
I noticed when walking home the other day that the high voltage (200kv I believe) lines running through here were hissing in the rain. What is causing them to hiss?
11
votes
12answers
3k views
Polyphonic sounds from a microcontroller?
I can make monophonic sounds by toggling a single pin (at a varying rate) connected to a piezo buzzer.
How can I generate two mixed audio signals in software to create polyphony?
Here's the code I'm ...
7
votes
3answers
809 views
How do I detect the pattern of the knock on a door, and use it as a signature to unlock a door?
How do I detect the pattern of the knock on a door, and use it as a signature to unlock a door?
6
votes
3answers
538 views
What electronic component of a computer produces (sound) noise?
Certain mechanical components of a computer produce noise, such as speakers, fans, harddrives and disk readers.
Can electronic components of a computer (transistors, resistors, capacitors, ICs, ...
6
votes
3answers
834 views
What is the simplest sound generating circuit?
I'm relatively new to electronics, and have no formal training other that what I picked up through my electrical engineer father. I solder well, can read schematics, have assembled kit projects with a ...
6
votes
5answers
3k views
Oscilloscope using laptop microphone input…is that possible?
Its possible to have an oscilloscope from the input of the sound card? I'm trying to log the states of a PIC32 pin (min: 0V, máx: 3.6).
Is it possible to put that value on a 3.5" jack and, on the pc, ...
6
votes
3answers
507 views
How do I measure loudness?
I was toying around with an idea for a digital musical instrument with breath control. I've successfully experimented with pressure sensors and they are probably the right way to go, but my first idea ...
5
votes
6answers
635 views
What causes “hard working” growling sound in a heavily loaded electric motor?
From my experience just any electric motor when under huge load would make recognizable growling sound. This would happen regardless of the motor type - brushed/brushless, AC/DC, small size/huge size ...
5
votes
4answers
626 views
Simple (?) pressure activated sound
I'm thinking about putting together something simple for my young son's soccer team. I'd like to build a simple circuit that could be placed on/underneath the laces of their shoes and plays a sound ...
5
votes
3answers
2k views
Why do my speakers make a noise when my cell phone gets a call?
It's a very common sound but I've never thought to question why it happens.
4
votes
3answers
1k views
My Atmega328 seems to be overkill, what should I use instead?
I'm using an Atmega328 chip with the arduino bootloader in a very small circuit. The sketch simply plays a tune using the tone() function to play a melody through a piezo speaker on a single pin.
...
4
votes
3answers
245 views
simple audio amplifier
I did this circuit in my protoboard, and it worked for a while, but the quality sound was terrible, and suddenly it stoped working. Can anyone explain me in which part of the circuit i did something ...
4
votes
1answer
274 views
What is the physical meaning of resistance and power ratings of a loudspeaker?
What exactly does it mean when it is specified that internal impedance (or resistance?) of a loudspeaker is 16 \$\Omega\$? Is that ohmic resistance of the copper of its internal winding? Or is it ...
3
votes
2answers
685 views
Low power way to make a sound
I'm designing a 3V button cell battery powered device. I want it to beep or click or just make any noise at some times just loud enought to be heard across the room.
I've made a prototype working on ...
3
votes
2answers
142 views
A question on difference between an computationally created sinusoid signal and the recorded signal (when played out through a speaker)?
I have created the following signal(in Matlab), a 5000 Hz sinusoid multiplied with a bump (just to limit it in time) so that it forms a short beep. Now if i observe the spectrum of this ...
3
votes
4answers
2k views
Connecting piezo buzzer with BJT
I have a 4 KHz piezo buzzer and a microcontroller (arduino) that outputs that 4 KHz from one of it's pins. All is fine if I connect the buzzer to the output with one pin and to the ground with ...
3
votes
2answers
2k views
Can you play Chords on Arduino with a single piezo speaker?
I need to be able to play two tones at once and i have the arduino uni with a small 8ohm piezo speaker. Is it possible to do so?
Sample Code
...
2
votes
4answers
226 views
Sounds or music into a DC fan?
Perhaps my understanding of how magnets work is off, but would it possible to play some waveforms into the positive and negative leads of a DC fan (think motherboard fan) and get a coherent sound? I ...
2
votes
3answers
653 views
Picking a DAC for an audio amplfier
I'm trying to use a specific audio amplifier, TPA3111D1, to power a 10 watt speaker from a microcontroller. I would like to generate sound from a microcontroller that doesn't have a built in DAC, so ...
2
votes
1answer
137 views
What's cheapest way to make a sound?
We have a portable small toy which we want to make a sound on it when is connected to socket. I don't know if we must use a little speaker with a magnet or maybe we can make a noise with a mechanical ...
2
votes
2answers
263 views
How to get higher frequency from DC power supply?
I desoldered a component, HY-05 Electro-magnetic sound generator, from a broken motherboard. Its DCV is 3~8V, operating frequency 2400 plus or minus 200 Hz. I can get a small metallic sound with the ...
2
votes
1answer
1k views
How to output sounds over a headphone wire?
I soldered some headers to a headphone line and was wondering how to make sounds come out of an audio device connected to that. I don't mean music, or anything advanced. Just two tones for RTTY. I'm ...
2
votes
3answers
1k views
Plans / tutorial for sound effect generator using only analog components?
I've been wanting to make a laser gun sound effect attachment for my son's bike. Currently, I'm using the electronics salvaged from his old laser gun toys. All of them seem to use electronics hidden ...
2
votes
3answers
875 views
Can I use a potentiometer to reduce sound level in a speaker?
I want to reduce the level of sound in a speaker (i think 6Ω 30w rms). I wonder if it is that simple to put a potentiometer in one of the cables.
If this can do the trick, how do I calculate the ...
2
votes
1answer
69 views
Do I need a RTOS?
My hardware would have a DSP with the following characteristics:
Sound generation (internal parameter will generate pure tones, white noise, filtered white noise or the sum of them).
I2C ...
2
votes
1answer
139 views
Determine suitable clock speed?
I want to learn about good techniques on how to choose the suitable clock speed for the microcontroller for a project.
For example i want to create a device with a pic16f877 microcontroller that ...
2
votes
4answers
234 views
Playing a small MP3 file
simulate this circuit – Schematic created using CircuitLab
I'm creating a hand-held device with a momentary push button that will activate an LED and play a sound or MP3 (I didn't include ...
2
votes
2answers
192 views
Detect a touch to the threads
I have a lot of threads stretched vertically. I want to detect the touch them. So that you can then play them like a guitar for example). What is the easiest way to do it (detect touch, not to make a ...
2
votes
2answers
188 views
technology to search small objects like pendrive, key-chains etc
I am a web developer by profession. few days back I lost 8gb pen-drive :( I don't it is in home or somewhere else.... So now I am thinking of a device which can be attached with small objects so that ...
2
votes
1answer
158 views
MP3 Player, does volume affect power use?
When playing sound on a MP3 player to headphones, does the volume level affect how much power is used? Intuitively I think that high volume = high power consumption, and low volume = low power ...
2
votes
1answer
274 views
Anyone used HDA/AC97 codec with ARM uC?
I've got bunch of spare HDA & AC97 codecs from mobos, is anyone was able to interface to them from usual ARM uC? Is it even possible?
Googling didn't helped me much. Any hints?
2
votes
2answers
312 views
Humming and Transmission issues
First of all, I am going through designing all of this because I did not find a ready made circuitry for my purpose which is mentioned later. If you know a circuitry that is well tested and does what ...
2
votes
1answer
189 views
How to filter out Harmonics?
I just learned about the awesome world of synthesizing with an Arduino and a resistor ladder. It makes a nice tone but it has lots of harmonics too! How can these harmonics be reduced? I know a little ...
2
votes
1answer
268 views
Drawdio the sound is very very low :S?
im a beginner at electronics.
im trying make an drawdio circuit with the instructions in the link below:
http://www.ladyada.net/make/drawdio/drawdio2schem.png
i have following components on the ...
1
vote
2answers
197 views
Using Audio Input of computer as Oscilloscope for Hobby Electronics
I just discovered an app for mac that uses the Audio Input of the computer and the AD-converter in the sound card as an Oscilloscope.
First, I was thinking this can't work... but theoretically, it's ...
1
vote
4answers
1k views
Controlling DC (Pager) Motor with Audio Signal
I'm trying to control a DC (pager) motor with a sound signal so that I can use an audio synthesizer to control the speed of the motor. I'm hoping to modulate the speed of the motor at audio rate ...
1
vote
5answers
419 views
How to Generate a square, sine, and triangle wave with DC input
I want to make a simple synthesizer as a start to audio electronics. I want to start with a simple square, triangle, and sine, which the user can vary the pitch.
Is there a simple circuit to do ...
1
vote
2answers
369 views
Arduino(Nano) Low hertz communication (sound)
I'm thinking about having two arduino's(nano) communicating with eachother, but I'm not 100% sure how. So I was thinking about the ways that are possible:
Radio
Visible Light
Sound
Wi-Fi
3G
And I ...
1
vote
2answers
2k views
Sound Sensor that can give feedback on the amplitude of different frequencies?
I'm trying to find a sound sensor that can give feedback on all the frequencies of sound and their levels.
The sensors I'm finding in my search however only support level of sound it seems.
Is it ...
1
vote
2answers
445 views
Small, low power buzzer
I am looking for a small, low power buzzer for my circuit. The components I found in the market do not fit my requirements. The piezo buzzers are too big (min diameter 9mm) while the electromagnetic ...
1
vote
2answers
242 views
Ultra High sensitive sound capturing sensors…
We are working on a project which involves in capturing signals travelling through a rail line... unfourtunately in our country, we have lots of joint in between rail tracks... So the signal get ...
1
vote
3answers
301 views
Trying to get that tube sound from a gainclone amp
A Gainclone amplifier makes for a nice simple benchmark/monitor amp. It is a class AB linear amplifier capable of 20 W - 120 W of power, and is based on a monolithic amplifier chip such as the LM1875, ...
1
vote
2answers
78 views
Mimic Blinker Ticking Sound
I am looking for a low power way to mimic the ticking sound of a cars blinker. I had an LED flasher that made a ticking sound, but now with the setup I am using the flasher no longer will work with ...
1
vote
2answers
267 views
mute de-amplify sound volume
I want to de-amplify the sound volume of my television.
My native language is not english, and I do not know the correct word, if any, for the opposite of amplify.
When my TV is turned from volume ...
1
vote
4answers
154 views
Headphones impedance and the SPL
The headphones A has an impedance of 32 Ohms.
The headphones B has an impedance of 250 Ohms.
Both of the headphones are similar by size.
Is it right that the headphones B will play quieter by ...
1
vote
1answer
461 views
Resonant frequency of piezo elements, and generating multiple tones
In another question I posed, there were couple of "piezo sounder" parts suggested for the purpose of a compact but reasonably loud, alternative to electro-mechanical hooters.
Was trying to understand ...
1
vote
1answer
202 views
Interfacing Vernier equipment and microcontrollers
I am the president of my high school's robotics club. We own several VeX robot kits which we have been using for a few years now. The physics department also owns several Vernier LabPro sonic ...
1
vote
0answers
223 views
Arduino adk: how to play music [closed]
I am fairly new to electronics, and as a school project, I want to make my own Android dock to use with my Galaxy Nexus running Android 4.1.1.
I am looking at how to output music using an Arduino ...
1
vote
0answers
148 views
I am looking for a way to interface a phone landline with my computer's sound card in both directions [closed]
My approaches so far:
This thread seems to go nowhere. It was trying to build the circuitry myself, but people have problems recommending suitable circuits. We keep on fiddling about with ...
1
vote
0answers
95 views
Using a Keyboard in a 556 Stepped Tone Generator
I'm in the process of making a simple stepped tone generator using the 556 timer, but I want to be able to have different resistors to change the pitch of the tone I get out. I think it would be ...
