Questions tagged [sound]

Audible vibrations transmitted through air or other medium

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39 votes
7 answers
67k 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 article I ...
Ricardo's user avatar
  • 6,154
11 votes
3 answers
36k views

How to convert volts to dB SPL

I am taking input from an electret microphone 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 ...
user35456's user avatar
  • 153
41 votes
9 answers
11k 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 ...
Mister Mystère's user avatar
9 votes
3 answers
9k 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, ...
Randomblue's user avatar
8 votes
5 answers
15k 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, ...
rnunes's user avatar
  • 831
5 votes
2 answers
10k 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 ...
h00j's user avatar
  • 161
4 votes
3 answers
3k 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. ...
fearoffours's user avatar
3 votes
1 answer
11k 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 ...
Kyle's user avatar
  • 658
3 votes
2 answers
2k views

3.5mm Push to Talk Switch

I am looking to take a 3.5mm microphone line, insert a press button switch (a foot pedal in my use case) between the headset and the computer. I would like the switch to mute the mic connection when ...
GroundSpyder's user avatar
-3 votes
1 answer
160 views

Can anyone help me write a program in Python to output 5V from a USB port to control a relay? [closed]

Can anyone help me write a program in Python to output 5 V from a USB port for only 2 min and then off for feeding a relay using only the power wires of the USB cable and without using an Arduino?
Osama Ghandour Geris's user avatar
18 votes
2 answers
19k views

Why do my speakers make a noise when my cell phone gets a call? [duplicate]

It's a very common sound but I've never thought to question why it happens.
Sean Southern's user avatar
15 votes
12 answers
13k 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 ...
Toby Jaffey's user avatar
  • 28.8k
12 votes
5 answers
11k 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 ...
dwwilson66's user avatar
  • 3,422
10 votes
2 answers
5k 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 ...
cbmeeks's user avatar
  • 1,200
7 votes
4 answers
1k views

Counteracting Sound Card AC Coupling for Reading Digital Data

Disclaimer: I am new to EE. Everything I have learned so far I have taught myself from reading online and posting questions like this while working on this project. I apologize if I do a poor job of ...
Mike's user avatar
  • 231
6 votes
2 answers
21k 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 it'...
dgw's user avatar
  • 173
5 votes
5 answers
9k views

Why place capacitors in front of the line to a (headphone) audio speaker?

I'm using this module based on the popular bluetooth module CSR8635 https://www.tinyosshop.com/index.php?route=product/product&product_id=875 I was wondering why, in the right-hand side of the ...
nick carraway's user avatar
4 votes
2 answers
4k 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 ...
Brett Allen's user avatar
4 votes
2 answers
4k 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 ...
user18197's user avatar
  • 199
4 votes
3 answers
4k 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 ...
wcmartin's user avatar
  • 641
4 votes
1 answer
179 views

Generated sound

I got these schematics from an arcade game released in 1983. These two circuits are responsible for generating two different sounds even though they look very similar. First one (sounds like a whistle)...
Paperino's user avatar
  • 215
3 votes
3 answers
2k views

Types of decibels

Why we use dBA or any other type of decibel unit instead of basic decibels unit (dB)? Why we have so many types of this unit?
Laki's user avatar
  • 521
3 votes
1 answer
123 views

Measurement of sound

I'm trying to develop what is shown in the image below: A sound level meter where through its input I can show the RMS value on a computer screen. For now I'm just trying to do the analog front end. ...
Scipio's user avatar
  • 793
2 votes
2 answers
199 views

How do I build a system for localizing sound source? [closed]

In my apartement I have the problem that when I am in my bedroom I can hear the neighbours in their bedroom exactly above me talking. Luckily I can not hear what they are saying but still pretty ...
Andy's user avatar
  • 265
2 votes
2 answers
2k views

Ultra High sensitive sound capturing sensors

We are working on a project which involves in capturing signals traveling through a rail line. Unfortunately in our country, we have lots of joint in between rail tracks. So the signal gets attenuated ...
Dilan's user avatar
  • 29
2 votes
2 answers
773 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 ...
Code Spy's user avatar
  • 121
2 votes
3 answers
1k 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 ! ;)
rflmota's user avatar
  • 151
2 votes
2 answers
2k views

How exactly does one calculate the proper filter capacitors for the 567 tone detector?

I'm making a wireless remote control system using the 555 and 567 IC's. Everything is working OK with the exception of the tone detector, yet I can hear the tone when I hook up a speaker to my ...
user avatar
2 votes
2 answers
2k views

Audio Jack Sound Signal?

I was experimenting with my laptop's audio jack port (the headphones one) and something that blew my mind happened. I took an AUX to AUX cable and connected it my laptop (so I could easily have access ...
GeorgeTsak's user avatar
1 vote
1 answer
3k views

Stereo heaphone doesn't work properly when the balance is centered [closed]

I have an old headphone (Philips SHP1900) and it used to work fine, until the day which I accidentally stepped on it... Since then, when I listen to music, the instruments sound really loud and the ...
julianaklulo's user avatar
1 vote
1 answer
700 views

Negative voltage ADC and op-amp

I have this circuit and I am running code on the raspberry pi which checks the input pin continuously and converts the 10-bit digital signal to a readable voltage. So I can accurately see the voltage ...
DonnellyOverflow's user avatar
1 vote
1 answer
339 views

Adding a waveform on top of an LED driver signal

My Background: I have a basic understanding of electronics from undergraduate physics courses and a few high-level digital electronics courses, but basically zero knowledge of anything analog/actually ...
wootie11's user avatar
1 vote
1 answer
690 views

Line level voltage to drive LED display

EDIT: Please read the whole post before automatically down voting. I KNOW the diagram is crap. That is what I am asking about. It isn't my diagram. Original post: I Web searched a bit and ...
mikeY's user avatar
  • 288
0 votes
3 answers
176 views

Water level detection using non contact sonic sensors

I have been working on a project, where I need to find the water level of underground borewells with a diameter of around 6-10 inches and a depth of up to 100 meters. I have been researching a lot ...
shwetank vishnu's user avatar
0 votes
3 answers
323 views

Why does an electret not pick up sound?

I am trying to get an electret mic to detect sound, which I can then pick up using a Raspberry Pi Pico ADC pin. My electret has two output pins. One is connected to ground, the other is connected to ...
user10709800's user avatar
0 votes
1 answer
659 views

speaker problem with high volume

I am trying to build an audio system . I have a speaker which is rated 10 W and 8 Ohms . I am using a circuit from datasheet of TDA2040 with a pre-amplifier circuit with the microphone . when I ...
Romyo's user avatar
  • 164
0 votes
1 answer
136 views

Loudspeaker / Amplifier "POPP" sound [closed]

I have different sound systems here. Some of them share the "problem" that they make a "popp" sound when I switch them on or off using the front-panel switch. If I accidentally switch off the socket ...
Justin Time's user avatar
0 votes
3 answers
989 views

The circuit-level "why" of the loudspeaker / amplifier “POPP” sound

in the other question about the "popp" sound I asked if the "popp" is harmful to a loudspeaker. Since I am also interested in the "why" on the circuit level, here is my next question. I put this ...
Justin Time's user avatar
0 votes
1 answer
88 views

Lower sound from 1st input when second input has sound

I'm looking for an IC/device/... that can switch between sound inputs. Lets say that I play music through audio jack 1, and a GPS is connected to audio jack 2. I'd like the IC/device to lower/kill ...
HDB's user avatar
  • 115