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Questions tagged [sound]

Audible vibrations transmitted through air or other medium

-2
votes
0answers
30 views

Sound interrupt at specified sound level [on hold]

How can I wake my system (interrupt) with a specified sound level? For example, I set a 10dBm sound level threshold and put my MCU into sleep mode. When the sound level is over 10dBm, I want to wake ...
0
votes
0answers
28 views

Reusing speakers from an old laptop: how to amplify them? [on hold]

I would like to reuse two pair of speakers got from an old ASUS 1201T laptop. Since I don't know the specifications of the speakers, I looked in the datasheet of the Realtek ALC269 sound card and ...
0
votes
2answers
40 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 ...
1
vote
1answer
41 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
votes
3answers
61 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
votes
1answer
72 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 ...
0
votes
0answers
55 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
votes
2answers
58 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
67 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
votes
2answers
121 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 (...
0
votes
2answers
44 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
votes
4answers
54 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
69 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
vote
3answers
58 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
vote
2answers
135 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
93 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
88 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 ...
1
vote
1answer
77 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 ...
26
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
72 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
110 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
58 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
64 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 ...
0
votes
1answer
25 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
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 $$f=261.63\ \text{Hz}$$ ...
0
votes
1answer
38 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
60 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 ,...
0
votes
1answer
78 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 ...
0
votes
1answer
88 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-...
0
votes
0answers
38 views

How come sound is muffled in my headphones even though all pins have continuity

I was wondering why my headphones sound muffled until I put pressure on the cable even if all the contacts on one side have continuity with the contacts on the other side. Picture for clarification: ...
0
votes
3answers
105 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 ...
0
votes
1answer
78 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 ...
0
votes
2answers
77 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 ...
-2
votes
1answer
82 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 ...
-1
votes
1answer
77 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
votes
1answer
180 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 ...
0
votes
1answer
56 views

Can you adapt 5 pin intercom headsets to work over a 3 pin clear-com system? [closed]

I'm new to an old theatre that had a clear-com system installed in it 30 years ago. The headsets all died before my time there and I'm looking at getting some new. All the plugs in the walls are 3 pin ...
0
votes
1answer
79 views

Can the frequency of an electrical current be heard and distinguished from other frequencies just by connecting circuit to a speaker?

I have a circuit that I want to be able to detect the frequency of the current going on it (part of the circuit is AC, the power supply is going to be at least 3v, probably 5v, and 6v DC at most). I ...
0
votes
5answers
310 views

What microphone (sound sensor) that can work with Arduino to detect gunshot?

I am working on a project to detect a very loud sound/Pop(like gunshot).I am using a microcontroller like Arduino. Currently I am using this simple sound sensor. But the issue is, it is very ...
0
votes
3answers
112 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 ...
1
vote
2answers
48 views

How to calculate the required battery capacity for audio system

I'm converting audio speaker to run on batteries. the speaker is Stagg SMS 8p - RMS 90W, peak power consumption 200W which is consistent with 1A fuse for 220V. Say I go with 12V battery - peak ...
0
votes
1answer
108 views

Lower volume on one earbud after fixing it (soldering) [closed]

Got one earbud wire ripped out accidentally, but luckily the wire itself was still fine, just had to open the earbud and solder wires again. My earphones are Atomic Floyd super darts, high quality (as ...
0
votes
0answers
18 views

Which battery to use to charge my arduino project?

when you are connecting ESP 8266 to an SMD UNO R3 Arduino board along with a sound sensor and a thermal sensor MLX 90614 , how much will be the range of power required to run this project smoothely on ...
2
votes
1answer
192 views

Is it possible to make an LED turn on with an HC-SR04 without using an arduino? Only when an object is near it?

I don't know anything about coding so I wish to achieve this effect without a help of an arduino. I'm trying to minimize as much power as possible and trying to achieve the HC-SR04 sensor to sense ...
9
votes
6answers
3k views

Why do different value capacitors and resistors sound different in same amplifier circuit?

I have two questions... I have seen that different value capacitors in an amplifier circuit, sound different... For example, an amplifier circuit with a 470uf capacitor, has more bass, and treble... ...
0
votes
0answers
114 views

I made identical copies of this metronome circuit, but only the first one is loud, not the ones that follow. How can i troubleshoot this problem?

I have followed the circuit that is attached below, and i also, soldered the components onto a PCB after having successfully tested the metronome circuit on a breadboard. However, all but the first ...
7
votes
6answers
3k views

Audio spectrum analysis: PC Software vs Hardware Spectrum Analyzer

I need to do some audio spectrum analysis (basically, listening to a machine and tell if it is properly calibrated). I will record the sound it makes with a microphone (it sounds differently if it is ...
0
votes
1answer
221 views

How can I wire up an quad channel amplifier to become stereo with 2 times the power?

I have an TDA7388 IC. This is an quad channel amplifier 40w on every channel. Is it possible to wire it up to become a stereo amplifier with 80w per channel? Circuit
1
vote
0answers
69 views

Loud sound and crystal clock,how big problem it is?

I want to use piezo crystal clock in place where loud sounds exist,I worry that it might decrease the performance of the clock,create spurious tones for example. The db level at the clock will be ...
2
votes
2answers
167 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 ...