Questions tagged [sound]

Audible vibrations transmitted through air or other medium

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0answers
51 views

Church Mystery Speaker Wires [on hold]

I live in an old church, in the sanctuary of the church there are six large speakers fixed to the pillars which are supposedly wired to the wires in the pictures and I have heard that when the ...
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1answer
45 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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21 views

Repair Sound Device Mix Pre 6 battery sled [on hold]

I am using a audio recording device SOUNDEVICES Mix Pre 6 with several powering options. One of them is a battery sled, the MX L Mount for the famous SONY FP970 battery. The adapter can hold 2 and ...
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0answers
39 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 ...
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1answer
30 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 ...
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1answer
33 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
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1answer
80 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 ...
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1answer
34 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 ...
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2answers
43 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 ...
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2answers
609 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? :( ...
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1answer
53 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
146 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 ...
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3answers
100 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 ...
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0answers
56 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 ...
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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 ...
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3answers
87 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 ...
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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 ...
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2answers
62 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
64 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 ...
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3answers
63 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. ...
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1answer
127 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
66 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 ...
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2answers
82 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 ...
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1answer
71 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 ...
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2answers
126 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
70 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 ...
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4answers
56 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 ...
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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 ...
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3answers
71 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'...
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2answers
174 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 ...
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1answer
234 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 ...
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1answer
93 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 ...
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1answer
80 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 ...
27
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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 ...
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1answer
110 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 ...
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1answer
143 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)...
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0answers
60 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 ...
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1answer
76 views

Outdoor proximity sensor, triggering siren, powered by solar

My dog keeps jumping into our flower boxes and digging in them, destroying what we're trying to grow. After trying different things, my conclusion is that I need to scare her every time she jumps in ...
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1answer
36 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 ...
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1answer
1k 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
42 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
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0answers
74 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 ,...
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1answer
116 views

Multiple MCP41010 Digital Potentiometers Work From One CS Signal

tell me please, for example, I control for example any parameter of the sound path of the guitar pedal with the help of MCP41010 and I need to make a dual potentiometer of two single-channel chips for ...
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1answer
124 views

Connect common ground stereo to a device with different ground for each channel

I have an old stereo that I want to resurrect and add Bluetooth to it. For that, I bought a Bluetooth module, this one: https://www.aliexpress.com/item/PAM8403-Wireless-Stereo-Audio-Receiver-Module-...
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3answers
155 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 ...
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1answer
86 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 ...
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2answers
160 views

Hummm Sound from stereo speaker when used on inverter

I have a normal 2.1 Stereo speakers with an aux 3.5 cable coming out as input source, i plug this aux cable to a source when needed else it remains hanging, whole speaker this is plugged in to an ...
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1answer
83 views

How can I get my speaker to work? [closed]

I have a portable speaker and it recently stopped working. I don't need to but I am interested in trying to get it to work again, although I know very little about electronics! I took the speaker ...
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1answer
80 views

Canceling ambient sound [closed]

I've just moved into a new flat and I noticed that there is a lot of car noise coming through windows. I know, I could just close the windows, but that's a less interesting approach to a problem. So ...
2
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1answer
211 views

Rotary switch that changes resistance on each click?

I am trying to create controller for my car head unit as it lacks a volume knob amongst other things. I have worked out that when tapping onto the control pin I can "send" commands by applying a ...