Questions tagged [sound]
Audible vibrations transmitted through air or other medium
466
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Board Voice Recognition Module V3.1 with Arduino Uno [migrated]
I have two speech recognition modules and I am using vr_example_train from the voicerecognitionmodulev3.1 library. One of the VRM works perfectly, the other one train the voice command too, but when I ...
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1
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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 ...
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3
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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 ...
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3
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1
answer
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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.
...
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2
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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 ...
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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 ...
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2
answers
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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 "...
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1
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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 ...
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4
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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 ...
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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 ...
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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 ...
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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 ...
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101
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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 ...
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answer
59
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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 ...
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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.
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66
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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.
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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 ...
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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 ...
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Coil sound when battery charger is idle
Why is there a noise from the coil in the circuit when the phone charger is idle?
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6
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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 ...
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Parallel resistor in line level output [duplicate]
I have a MONO LINE LEVEL OUTPUT and I want to share it with 2 devices (which will received the LINE LEVEL OUTPUT and use it for whatever reason). In one of those devices I need to use a 10K ...
Batata004
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141
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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 ...
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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 ...
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2
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351
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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 ...
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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 ...
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0
answers
95
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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 ...
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70
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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 ...
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4
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129
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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 ...
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2
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41
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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, ...
user306683
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201
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Difference between speaker and subwoofer voice coil
What is the difference between speaker, woofer, and subwoofer voice coils?
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53
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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 ...
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1
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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 ...
3
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1
answer
99
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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.
...
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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 ...
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142
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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 ...
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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 ...
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4
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1
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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)...
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using LM3915 to switch relay or motor
I am trying to switch either a 12v motor or a relay with the outputs of a LM3915.
I have found an answer on this site about using a pnp transistor on the outputs to switch multiple leds. the circuit -...
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1
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189
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Ultrasonic phased array speaker spacing for high directivity and efficiency
(Short version of question(s) below.)
I want to make an ultrasonic parametric speaker at 40kHz, I want to drive them all at the same constant frequency to keep the electronics cheap.
When simulating ...
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2
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1
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292
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Ultrasonic digital parametric speaker: What kind of modulation and how does it need to be modulated?
I searched for information on digital 40kHz ultrasonic parametric speakers. While most open sources do mention that you need some modulation, what type of modulation and how it does so is hardly ever ...
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How to do sound localisation for an Inmoov Robot
I have to do sound localisation for a humanoid robot. This is my final year project given by our sir but I have no idea how to do it can anyone help me
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1
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88
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Analog sound data
I tried to make my own sound sensor on a PCB. I wanted to take analog sound data for my project. I used an ADC pin from a STM32G474, but I maded mistake while I designing. I took a KY-038 reference ...
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Filtering Frequency Peaks of Sound File
I'm looking into using a 7 second long .wav sound file, and turning on an LED for 0.5s once a 500 Hz peak is detected. I have looked into several methods on how to achieve this. My main idea was to ...
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258
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Interfacing a microcontroller to a PDM microphone via DMA and low power
I need to interface a low power PDM microphone (Vesper VM1010) to a low power microcontroller with ZigBee support. For the latter, I've settled on Silicon Labs EFM32 Gecko, primarily due to its ...
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418
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Envelope detector for audio compressor
I found the envelope detection part of an analog audio dynamic range compression circuit here, and I'm trying to figure out the purpose of:
The second series diode
The 100k feedback path from the 2nd ...
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77
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Customising audio on an arcade game with U6295 audio IC
I have an arcade redemption game that has a U6295 audio IC that plays 4 different soundtracks which are stored on a ST M27C801 EPROM.
I would like to flash my own audio onto that EPROM with one of ...
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2
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249
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Monitor microphone signal on a USB oscilloscope
I would like to monitor a microphone signal on my cheap USB oscilloscope (LKHT00SU1.) I have tested it with a square signal generated from an Arduino.
The microphone is a small one with a 3.5mm jack (...
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2
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73
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Loudspeaker alignment graph
Hopefully a simple question. I was wondering what the blue line in this graph represents.
This is looking at loudspeaker modelling.
The red line is obviously the frequency response as loudspeakers are ...
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69
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Acceptable SNR for a Sound Level Meter
I'm designing a low power (<150mW) sound level meter (SLM) using a 24bit ADC (preliminarily using the LTC2512-24). This is for audible frequency range signals only (20Hz - 20kHz). I'm focused on ...
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How can I produce a continuous sound of pressure 70 dB with randomized noise? [closed]
How can I achieve a sound system that can produce a continuous sound with randomized noise in the range 70-75 dB?
I need that for conducting a medical experiment in which the doctor measures stress ...
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