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Questions tagged [sound]

Audible vibrations transmitted through air or other medium

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Gain depending to Frequency

This script sets up a server that listens for incoming connections. It reads audio data from the client in chunks of 1024 bytes, processes it using FFT (Fast Fourier Transform) with frequency-...
Phaze Music's user avatar
0 votes
1 answer
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Shared buzzer - algorithm for switching on and off

Question is not about electronics but requires specific experience in building the electronics. I am designing the circuit which would beep with various shapes - on/off durations as well as beep ...
Anonymous's user avatar
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Digital Microphone Readings to dB SPL

I've seen previous answers on how to calculate the dB SPL based on my I2S readings but I can't come up with a formula to calculate it. I use the MSM261S4030H0 I2S microphone with sensitivity of -26 dB ...
Phaze Music's user avatar
1 vote
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Cross-compile and run aac-fdk on Cortext M0+ like the RP2040

I am creating a small device that should be able to input sound from a I2S microphone and to compress this sound using AAC LC compression. In another thread I was recommended a Arm Cortex M for this ...
www.jensolsson.se's user avatar
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2 answers
136 views

Generating a clear sinusoidal wave through the oscillator to generate the "Ding Dong" sound

I am working on a project to try to recreate a close replica of the "Ding Dong" doorbell sound. I have yet to make the decay. (I would definitely appreciate if you have tips for that.) I am ...
user369928's user avatar
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PCM to dbspl conversion in esp-idf

using i2s interface of esp32-wroom-32 i am getting PCM data from PDM micro-phone. how can i measure acoustic sound pressure level? below is datasheet sheet of micro-phone. from 16-bit array how can i ...
Moaz Azam's user avatar
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2 answers
44 views

KY038 sound sensor: Voltage to SPL

I'm writing code to measure frequencies with a KY038 microphone sound sensor. It uses an LM393 voltage comparator. How do I convert voltage to sound pressure level (SPL)?
HAMZA SAVAI's user avatar
3 votes
2 answers
560 views

MEMS microphone encode to AAC low performance

I am looking for a solution to encode the data from a MEMS microphone to AAC LC. I have a small microcontroller that is very low power but that lacks the RAM required for encoding so I am looking for ...
www.jensolsson.se's user avatar
10 votes
6 answers
2k views

Is there any way to measure sound intensity in decibels without using a microphone?

I am trying to measure sound intensity in decibels without using microphone in a home automation project. Due to privacy concerns, I don't want to use a microphone in the device. Is there any way I ...
Moaz Azam's user avatar
2 votes
1 answer
101 views

How does the voice coil affect volume in DIY headphones?

I know nothing about electrics. I am learning some very basics by making a pair of incredibly simple headphones with a 3.5mm jack, some enameled wire, some magnets, and some paper cups. After a bunch ...
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Rising Edge Demux

I'm trying to create a demux for the YM2610 sound chip. The sound chip selects whether to set the low bits or high bits of the address with a single pulse; the rising edge should trigger a latch for ...
S T's user avatar
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DIY Bluetooth speaker

This is my first project. I have two 2 ohm, 12 W speakers. I need a very good quality sound amplifier with Bluetooth if possible. Is the PAM8610 good in terms of sound quality? Can someone suggest an ...
KaMlesh GeHlot's user avatar
-3 votes
1 answer
288 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
0 votes
1 answer
51 views

STM32F407G-DISC1 AUX to Laptop Aux [closed]

I am working with STM32F4 board and signal processing, generating some sin waveforms on CODEC, the problem is that I don't have oscilloscope on me and want to see what waveforms I am generating. I ...
Dominykas's user avatar
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1 answer
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Ferrite beads for a pam8403 board

I can't figure out the EMI part of the datasheet for the PAM8403 chip. Which ferrite beads should I use for amplifier output? Does anyone know any specific models of ferrite beads? This is what the ...
Mia's user avatar
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1 vote
1 answer
125 views

How to convert from datasheet dB value to pressure per volt?

I am trying to measure sound waves using a Raspberry Pi Pico ADC pin but am having trouble converting the sensitivity value on my data sheet into pressure units per volt. I have read a many articles ...
user10709800's user avatar
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3 answers
357 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
3 votes
1 answer
102 views

Can I use a contact microphone to detect a fan running / not running inside an electronic product?

I'm involved in thermal testing of an electronic product which contains a small centrifugal fan. The product is entirely sealed and no signals can be transmitted through the case when it's operating. ...
anon33's user avatar
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1 vote
2 answers
56 views

Trying to make a glorified aux splitter, but it won't work

I have a project due in a couple of months, and decided I want to make a aux splitter where you can control the volume of left and right on two inputs and get a single output, kind of like a mixing ...
FrodeSanden's user avatar
0 votes
1 answer
58 views

Intentionally cutting off an audio signal at high volume

TL;DR: I am looking for a the best way to amplify all external sound but cut off at a hearing safe level. I am attempting to incorporate active ear protection into an old SPH-4 helicopter helmet. I ...
David G's user avatar
11 votes
2 answers
1k views

What is the coil for in these cheap tweeters?

I disassembled a cheap tweeter because I wanted to use only the inner part of it since it is just about 5mm tall (1/4 inch). I thought the coil that surrounds it was just a cheap inductor to "...
Jahaziel's user avatar
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2 votes
1 answer
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Question on electronic chanting box [closed]

I am trying to understand how the chanting box works (https://www.youtube.com/watch?v=niPnT44oev0) basically a box when switched on will play a bunch of prerecorded songs (10-15 songs). As per my ...
Mat's user avatar
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4 answers
139 views

How to give small voltage signal to Arduino?

I have a device which audibly says a specific line, let's say it says "received payment of $5," and the device has a speaker connected. Now I want when it says this line, my Arduino should ...
Shashank Kumar's user avatar
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0 answers
121 views

What is the correct sensor to use for capturing ambient noise?

I'm working on a project to capture ambient noise in my room (e.g. coming from the nearby vehicles, birds, etc.) for audio analysis (understand loudness/frequency characteristics). Problem is I'm ...
kovac's user avatar
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Sound amplification through a marine speaker

Trying to get these old marine speakers to be much louder than they currently are. This was apparently done in the past so the answer should be out there. There was a 30 year old circuit that was so ...
user2953379's user avatar
1 vote
1 answer
191 views

HP/Agilent 34401A low beep sound level

I want to modify the internal beep sound pressure level of this bench DMM and make it louder. I have a problem with my ears and I won't be able to hear the the beep sound well when making continuity ...
Fichamba's user avatar
0 votes
1 answer
416 views

RPM of a motor from frequency

I have a very old motor which I can't find any information about. I need to calculate its RPM for some work. I've attached a cog to it, held a piece of paper up to it and recorded the pitch. It was ...
Chris Martin's user avatar
0 votes
1 answer
63 views

How to calculate watt-hours used by the @channel Slack notification sound

Imagine someone used @channel in a Slack channel with 100,000 people. How many watt-hours are used to play the Slack notification on the laptops for these 100,000 ...
Indigenuity's user avatar
4 votes
1 answer
100 views

I am rewiring my old guitar and I need help with the potentiometers

Is it possible to convert a 250 kΩ potentiometer to 500 kΩ or a 500 kΩ stereo potentiometer to mono? I am finding it difficult to locate a 500 kΩ mono potentiometer.
Ocean Man's user avatar
0 votes
2 answers
207 views

How to calculate SPL change from a sound source to a listening position?

I need to know how to calculate SPL change from a sound source to a listening position. I already know the distance between the speaker and the listening position and also the SPL at the speaker.
parvin's user avatar
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1 answer
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How do I make a good frequency multiplier for a basic sound chip? It uses a DAC, so it needs a high input frequency for lower output frequency

I'm building a simple triangle-wave sound chip based around a 4-bit DAC. It works, but I have to have each individual square wave for each of the 16 notes (which are bass-range, 60Hz-238Hz.) I want to ...
cheese's user avatar
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1 vote
1 answer
228 views

Circuit design help: producing ultrasonic sound waves

I'm working to develop a device that produces ultrasonic sound waves (40 kHz) to scare away animals. We used the circuit schematic shown below in our prototype with this transducer and a 12 V battery ...
popeye3024's user avatar
1 vote
1 answer
73 views

Coil sound when battery charger is idle

Why is there a noise from the coil in the circuit when the phone charger is idle?
Burak's user avatar
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7 votes
6 answers
2k views

How can I make a reliable tick tock sound electro-mechanically?

I'm hoping to help someone make a metronome-like device, but it'll tick like a clock once per second, all of the time. I was wondering how to produce that sound in a reliable way. There are 32 ...
Paul Uszak's user avatar
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-1 votes
1 answer
471 views

Speaker amplifier on ATX PSU is noisy when PC's 3.5mm jack is plugged in

I'm running a small class D speaker amplifier directly on my PC's ATX 12v rail (like this), so that it switches on when my PC turns on. This works great when I play music on it from my phone, but when ...
aai aai's user avatar
1 vote
0 answers
112 views

Improving the quality of YD1875 audio amplifier IC

I had some 1875 amplifier ICs laying around from my old VCD player. I decided to give them a shot, but no matter what LM1875 circuit I slapped together, it didn't work. After much frustration I found ...
ParSa's user avatar
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3 votes
2 answers
516 views

Square to triangle wave converter frequency range adjustment

I am working on a synth module that converts a square wave (generated digitally: High - 10v; Low - 0v; Duty cycle = 50%) to triangle wave output. I've found this schematic that works for an already ...
Ivan Demyachenko's user avatar
0 votes
1 answer
252 views

How to increase sensitivity of sound sensor?

I'm using a sound sensor, hooked up to an ESP32, to determine whether a medium-sized pump is running or not. While this works well when the pump is running loudly, it works less well when the pump is ...
Chandler's user avatar
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0 answers
151 views

DAQ sound acquisition

I have a simple USB DAQ device (datasheet). I was hoping that with differential voltage I would be able to measure simple sounds and convert/store them as a simple audio file (e.g. WAV, MP3). I see ...
alex's user avatar
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0 votes
2 answers
126 views

Power supply with incorrect voltage

I have found that the voltage at the output of this power supply has the wrong values. Where +-12 V should come out, it was oscillating between 16 and 17 V, but I managed to correct the oscillation by ...
Natan Santos's user avatar
0 votes
4 answers
145 views

Are there electrical methods to make noise without a loudspeaker? [closed]

I am designing a toy that needs to provide an audible response to an action, but I do not want to use a small loudspeaker. Is there any other way of creating a sound? For instance, filling a chamber ...
leelio's user avatar
  • 9
0 votes
2 answers
43 views

Time period for analysing an instantaneous sound wave and then converting it to the frequency domain?

I am confused about how a signal is analysed in the frequency domain after being recorded in the time domain instantly. Does the spectrum of frequencies that are displayed based on a previous period, ...
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0 answers
334 views

Difference between speaker and subwoofer voice coil

What is the difference between speaker, woofer, and subwoofer voice coils?
Aaryan's user avatar
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1 vote
1 answer
60 views

Control R channel volume from L channel

I have a mono line level (signal and GND) and I want to create L and R channel from it (to output sound to 2 separate speaker) BUT I want to be able to control the volume of the R channel.   Creating ...
user314164's user avatar
3 votes
1 answer
132 views

Why is my oscillator way too different from simulation results?

How's going dear engineers. I hope your everything's going well. I've made a sawtooth waveform oscillator aim for about few hundread kHz. I didn't see any problems on simulation results, everything ...
shortcircuits's user avatar
3 votes
1 answer
128 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
  • 803
0 votes
0 answers
36 views

Targeted voice sensing in noisy environment

My exercise, for my own interest and use, is exploring a way of measuring the relative volume of one person's voice when in conversation with a group of people. My first idea entailed logging noise ...
Simon Owen's user avatar
0 votes
0 answers
174 views

TPA3112D1 PCB design no output sound

I'm still learning about electronics and wanted to make a simple 25W class D audio amplifier circuit as a hobby project. The circuit I made is inspired by the TPA3112D1 Evaluation Module. The ...
Thomas's user avatar
  • 1
0 votes
1 answer
150 views

LM748 uses positive rail as an input on a 1980's UK sound effect generator. Is this an old trick that I've never seen?

TP9 is a +/-15V signal from a VCO. The signal to the base of Q7 is 0 - 10V from another card that is presumed to be basically DC. The multiplier AR11 has a sound coming from an LFSR circuit on another ...
B Conk's user avatar
  • 11
4 votes
1 answer
180 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

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