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Questions tagged [sound]

Audible vibrations transmitted through air or other medium

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votes
2answers
36 views

Transistor amplifier keeps flickering between working and off

So long story short, i got some speakers from an old music player and they are huge (around 2.5 inches diameter and 1.5 inches high), i gave them new wires to use with a breadboard so i used a ...
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1answer
68 views

Is it possible to build diy noise cancellation device? [closed]

I was studying physics few years ago and I know you can produce inverted waves to cancel waves in water . In theory sound waves are same as water waves but I don't know if it'll work in real life ...
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1answer
37 views

Speakers Power and Quality Difference Factor

I started tinkering with speakers (mostly amplifier circuits) and I learned a lot about how sound and amplifying works but I don't understand how to increase quality I have several kind of speakers , ...
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2answers
57 views

In general, construction wise, what makes a speaker more or less sensitive to mid tones?

I bought a second hand vintage boombox and the left (full-range/'woofer') speaker has gone so I replaced both speakers with some Sony ones. The Sony ones are taken from of cabinets lying around (the ...
0
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1answer
32 views

pam8403 using low wattage speaker

I am using the output of usb sound card as an input to PAM8403 ic with specs from datasheet. However i am using 4 ohm 0.5 W speaker. So i have tried testing with that and it works but sometimes with ...
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2answers
108 views

Why is the microphone output level not proportional to the sound level?

I set up a system to measure the sound pressure level in a location. This consists of a Knowles SPU0410LR5H-QB microphone connected to the codec SGTL5000, which is connected to the micro-controller ...
3
votes
2answers
124 views

Potential hardware solutions to detecting which string/fret is being played on a guitar? [closed]

I'm aiming to translate sounds played from the guitar to guitar tabs (accurately). I've had a look at solutions for detecting which string is being plucked: Detect string plucking in electric bass ...
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0answers
35 views

Clap switch working on 220 Volts AC

I have made this clap switch.It is working fine presently. I need suggestions for improvement for its long term use. Specifically I want to know if the capacitor based power supply is okay in this ...
0
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4answers
101 views

sound to voltage

I'm searching for a method that can convert sound to voltage. I have a .wav format file. The .wav file format is 16bit and 44kHz sampling rate. I want to play the .wav file on my PC and convert PC ...
2
votes
1answer
46 views

LM567 or Custom bandpass filter

I'm using a array of hydrophones to localize an underwater pinger (37.5 kHz and 45 kHz) and I'm thinking of using LM567 tone decoder as a frequency filter. The other option is to design a custom ...
1
vote
1answer
50 views

Headphone sensitivity/efficiency

Most commercial headphones are advertised to have sensitivity greater than 90 dB/mW. But to my understanding, even with 100% efficiency that's not possible (if we use 10 log (I/I0) where I = 1 mW, we ...
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0answers
46 views

DIY high fidelity audio using delta sigma adc

This question may be too general, but I will include all the details that I can. My end goal is to achieve a super high-resolution spectrogram of any recording I choose to make. By doing some tests I ...
0
votes
1answer
37 views

Translating mic sensitivity dBV to dBSPL

In mic datasheets, mic sensitivity is usually expressed in dBV that equates to 94 dB SPL (@1kHz). So if my mic sensitivity -46 dBV equates to 94 dB SPL, does that mean that if I double the signal by ...
0
votes
1answer
54 views

Simple 12V preamp circuit before speaker

In my apartment building, we have an intercom system with one central unit and multiple terminals, one per apartment. Unfortunately, after some unknown tweaks done a couple of years ago to the central ...
3
votes
1answer
82 views

what is the difference between these two configurations?

I can understand this circuit configuration: But i don't understand when signal is placed in Qp's base. In this configuration we don't have VBB/2 in the two base... Sorry about my english and thanks ...
1
vote
1answer
47 views

Refraction vs Reflection in Ultrasonic sensor for water level detection

I want to use ultrasonic module JSN-SR04 for detection of water level inside tank. The US module has single sensor for Transmission and Reception of US signals as shown below. I wonder if US sensor ...
0
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2answers
52 views

Powering condenser mic while getting the signal

http://www.afrotechmods.com/groovy/amplifier_tutorial/amplifier_tutorial.htm Look at the extreme left part of the circuit above seem to power the mic by 9v through a 5k Ohm resistor that powers the ...
2
votes
2answers
628 views

Why is the output signal of my amplifier heavily distorted?

I checked the circuit 1 million times. I got it from a website. Everything is correctly connected. The sound is loud, but it is very distorted. I use a 9 V battery. Where is the problem? :( ...
0
votes
1answer
55 views

What will be the effect of changing the order of the filters on the sound coming from each speaker in my audio system?

What will be the effect of changing the order of the cross over filters on the sound coming from each speaker in my audio system?
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4answers
148 views

How did old games from 8-bit era game consoles store music?

Some time ago I found that the audio of a game called Ninja Gaiden 1 (NES) is around 1 hour. This is excluding the sound effects like jump and hit e.t.c. Then I found that the entire game size is ...
0
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3answers
144 views

Why do carrier waves sound silent on radios?

I was recently reading about and building low-power AM radio transmitters, and read/noticed that when the carrier wave is not yet modulated, the radio receiver goes silent. For example, let's say my ...
1
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0answers
143 views

How to Low-Pass PDM Output Data

I have a PDM-Mems Microphone which provides me with 101010 data, the Microphone has a Clock of 3Mhz. I read the manual about how PDM is generated, but I haven't worked with digital filters yet and in ...
-2
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1answer
34 views

producing a continuous sound using a timer

I'm looking to produce a pure sound on one frequency to be played via a timer to come on at intervals over a six week period. this is for an undergrad dissertation. would an arduino work and could it ...
0
votes
3answers
101 views

Ultra-low power sound/audio sensor for LOUD noises

I'm searching for a sound/audio sensor with ultra-low power consumption to detect the presence of a really loud noise (100dB+). The controller runs on battery and there is no option for a different ...
7
votes
5answers
2k views

Voltage of sounds of MP3 files

What is the maximum voltage for common music files? When playing back on a smartphone, if the volume of the smartphone is set to maximum, how much voltage is sent to the earphones of the electric ...
1
vote
2answers
67 views

Circuit Choices for AmpIifier Input

i have breadboarded a TDA2050 amplifier, using this schematic i get good sound intensity with a half acceptable quality. the down side is the constant noise and humming. i have found a possible ...
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2answers
67 views

Replacing elements in a tube amplifier

I assembled a tube amplifier.According to the specified scheme (Old Russian radio "Record 66"). 1.What is the function of capacitors C9 and C8 ? 2.What will change the capacity of these parts? Will ...
0
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3answers
66 views

Convert -dB to equivalent +dB

I asked this question on stackoverflow and stackexchange mathematics, but on both sites my question was closed and suggested to ask here as mentioned in the comments to this question on mathematics. ...
0
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1answer
171 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 ...
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0answers
69 views

Custom microphone amplifier poor high frequency response

I've designed and received a custom MEMS microphone amplifier PCB, but am having issues with poor high frequency response and very low sensitivity/gain. Basically the microphone stops picking up ...
0
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2answers
102 views

How can I test a microphone circuit with a test signal

I have a microphone circuit very similar to below but I don't have a mic which is on back order. I would like to test the circuit (and the processing that happens downstream) in the meantime. Is it ...
0
votes
1answer
73 views

Creating a custom playback device

First of all, let me apologize if this isn't the correct place to ask this. This is the one of the best places for my question that I've seen so far. I've been designing a box for on my desk that ...
0
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2answers
130 views

Hardware For Emitting Specific Sound Frequency [closed]

I need a battery-powered hardware setup for emitting a specific frequency or a range of frequencies, in the range of 17kHz-20kHz. It should be picked up by microphones from at least 8 meters away (...
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2answers
85 views

Can I connect a 16 ohm output signal to a line input if I use a resistor in series?

newbie here. I have a Hi-Fi system and I wish to connect its output to a line input in another system while still being able to hear through the Hi-Fi´s original speakers. If I use the Headphone ...
0
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4answers
60 views

simplest way to create an activatable alarm on a speaker?

I have made a circuit that produces a 3.3V high when its active and 0V when it is off. Now I would like to extend it with a speaker that plays some sort of alarm (although it shouldn't be too ...
0
votes
1answer
70 views

How can I make a circuit that amplifies and mixes, at different ratios, the sound signals coming out of two different instruments

Do I need to use 2 sound sensors to detect the sound signals? If yes, can the sensors be connected directly in the circuit? or do I need to use an Arduino card and program it? Instead of the the ...
1
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3answers
77 views

Output impedance and loudness

I've a DAC for headphones (GeekOut 720) which has two output jacks with different impedances: 47 Ohm (with a large headphone icon next to it) and 0.47 Ohm (with a small headphone icon next to it). I'...
1
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2answers
195 views

Controlling Speaker Output with Transistors

I am awfully new to circuit design and a little confused on some of the things I can and cannot do here, so please bear with me. In a simple Arduino project, I am trying to control the output of an ...
0
votes
1answer
313 views

Whistle while charging small cell phone power bank

I've one of those small batteries used to charge mobile USB devices like cell phones when there's no accessible power outlet around. It's a Cellularline FREEPSLIM3000 model HY-L-3000. Last time I ...
0
votes
1answer
99 views

Is 3.5mm jack to female Apple Lightning adapter technically possible?

I couldn't find a trustworthy source for whether Apple EarPods are digital or analog, but I'm pretty sure it is digital as most teardowns show a chip on it that might be a DAC. Should this make ...
2
votes
1answer
85 views

What's causing the audible 7/8th rhythm in Qi chargers?

I have a wireless Qi charging system for my mobile phone. When I put the phone into the cradle it starts getting charged and I can hear a very quiet noise coming from the arrangement. Other ...
28
votes
4answers
9k views

I've become an electrical conductor for my headphones… but how?

So I have a pair of Bose noise-cancellation headphones that I plug into my keyboard every night to charge them (via my keyboard's USB port). My keyboard happens to be a metallic Apple keyboard. You ...
1
vote
1answer
143 views

Why is my DC motor making a rattling scraping sound?

The DC motor on my hob extractor fan is making a rattling and scraping sound when I switch it on. I know it is coming from just the motor because I have tried running the motor on its own. What could ...
1
vote
1answer
180 views

How to add an UPS beeper volume controller so that I can make it sound quieter when it beeps?

I've an EATON 5E850iUSBDIN 850VA/480W UPS. This UPS makes a very loud beep sound both when it's first plugged into the mains(short beep) and when it's first turned on from the button(3x longer beep)...
1
vote
0answers
61 views

NPN / PNP Sound activated LEDs

I have some RGB LEDs (common anode) and I'd like to control them via sound from my stereo (line level). I'd like to be able to switch the two behaviors of the LEDs from flickering off when the input ...
0
votes
1answer
44 views

Adafruit audio FX mini and 2.5W amplifier

I am connecting Adafruit's Audio FX Mini board to a small Adafruit's amplifier. In order to save some power when the sound board is not outputting any sound, I wanted to connect ACT pin of the sound ...
7
votes
1answer
2k views

How to produce a middle C on intel 8080?

This is a example problem in my book. Assuming pin 5 of port 4 is connected to an amplifier that drives a loudspeaker, the solution is given as, The frequency of middle C is $$f=261.63\ \text{Hz}$$ ...
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1answer
43 views

Why does my 3 V EL inverter make sound?

The question is purely academic, as normal sound dampening solutions seem to work fine. I understand how electronic circuits make sound as per this answer: How can "purely" electrical ...
2
votes
0answers
92 views

What is the reason for high frequency noise when amplifier is powered with battery?

Hi I made a small headphone amp and powered it using lipo battery.voltage is stepped up to 5v.everything is working with direct supply (ie., while charging battery)but as soon as I unplug the charger ,...