Questions tagged [sound]

Audible vibrations transmitted through air or other medium

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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 ...
harpomiel's user avatar
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Sound level meter using a microphone with ADC

I'm working with STM32F4, MAX4466 amplifier and a condenser microphone. In other words, Adafruit 1063. I want to get the sound level in dB unit. I know: Microphone sensitivity: 0.0063096 V/Pa ...
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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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1 vote
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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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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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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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How to sound-amplify my ESP8266

I've set up a ESP8266 to play MP3 radio from a web server, using the ESP8266 Audio library. My circuitry is pretty much like this: My question is, how can I amplify the volume of the sound, as it is ...
YoavKlein's user avatar
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Audio Circuit Playback

I have an audio circuit setup currently in which a microcontroller (PIC32MM) sends PWM signals to an amplifier which is attached to some speakers in order to hear what is going on. I have attached a ...
daswer's user avatar
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1 answer
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dB SPL Calculation is not making sense- values are seemingly too high

I am using an electret with a sensitivity of -38.44 dBV to make sound measurements at a distance of 1m. I decided to add an amplification circuit with a gain of 125. So in the end to convert to SPL, I ...
Thabiso Msimango's user avatar
1 vote
1 answer
408 views

How to connect microphone mono to stereo power amp

I try to connect mono microphone to stereo power amp like this image. I connect line of microphone to left and right of power amp input and ground of microphone to ground of power amp but it have no ...
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Frequency response measurement problem with mobile phone: same (wrong?) readings for different speakers

I have built some bespoke speakers and tried to measure their frequency response. My rig is: Source: Android phone Samsung A3 as a source, playing frequency sweep using Android's Frequency Generator ...
Nestor Milyaev's user avatar
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Directional Speakers

I am working on an exhibition where I want to use DIY, self-made directional speakers for transmitting interviews to the visitors. Until now I have seen a couple of video on Youtube like the one ...
Ed1995's user avatar
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Components to record ultrasonic sound? Up to 200kHz

For a personal project, I’m trying to record ultrasonic sound. I would like to find the best way to record from 20kHz to 200kHz. As I found from Wikipedia, animals can hear up to 200kHz. As I prefer ...
CharlieWhite's user avatar
1 vote
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429 views

Amplifying analog signal from AO of KY-038

I'm using a KY-038 for sensing sound if I connect the DO pin and set the potentiometer to the highest viable sensitivity then if I make a loud sound it detects and sends an output upwards until 1023. ...
dydx's user avatar
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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 ...
Frederick King Cunningham's user avatar
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80 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 ...
Sam W's user avatar
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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 ...
wav scientist's user avatar
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984 views

What difference a change in hertz vs duty cycle make to the pitch of a sound?

For example, 100 hertz sounds very low, but acquiring that from an online source that doesn't tell me the duty cycle doesn't answer my inquiry into whether a change in the duty cycle will affect the ...
Roman's user avatar
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949 views

conversion dB into dB SPL

I'm using a sound calibrator (1kHz, 114dB SPL, GRAS Type 42AB). When I got my data from my scope, the signal has 5mV. In spectrum mode, it is -50dB at the peak of 1kHz. I'm using this preamp: GRAS ...
Vincent.L's user avatar
1 vote
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1k views

ADC input to raspberry pi - I2C vs I2S

I'm trying to create a microphone array and take readings into a raspberry pi. I'm having an 8 bit ADC connected to the pi via I2C (SCL and SDA pins). I'm able to read samples (0-255) into my pi using ...
Kevin Martin Jose's user avatar
1 vote
0 answers
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Using a Keyboard in a 556 Stepped Tone Generator

I'm in the process of making a simple stepped tone generator using the 556 timer, but I want to be able to have different resistors to change the pitch of the tone I get out. I think it would be ...
M. Choi's user avatar
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2 answers
28 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
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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
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104 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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70 views

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
0 votes
1 answer
370 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
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124 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
  • 1
0 votes
2 answers
93 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
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287 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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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
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0 answers
161 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
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0 answers
83 views

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 ...
Ramsom's user avatar
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0 answers
87 views

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 ...
davegravy's user avatar
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0 answers
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DC pop with audio input switching in radio unit

I'm working with an older 1980s car stereo. I added aux by cutting signal trace to tone control module (which goes: signal -> caps (100nF x2 in parallel, by design) -> tone control IC -> some ...
fpxd's user avatar
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0 answers
274 views

Playback volume from old Sony voice micro cassette recorder is very low

I have an old Sony V.O.R M-529V microcassette recorder. It was found in a box packed away years ago. I put in some fresh batteries and tried to play some old micro cassettes I had, but the play back ...
The_Vintage_Collector's user avatar
0 votes
1 answer
39 views

Stereo Headset Volume Different

I have a headset (HyperX Cloud II), the speaker of the right cup lost sound, after diagnostics, one of the wires that runs between the two cups was faulty (two wires run in the same cord) so I ...
Christopher Lovell's user avatar
0 votes
0 answers
127 views

Sound operated relay

I am new to electronics and I can't get this simple circuit to work. Can anyone please tell me if the circuit is drawn correctly and the values are right? It is supposed to run on 5 to 12 volt. I am ...
Juan's user avatar
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0 votes
0 answers
484 views

Use stereo DAC for mono application

I am developing an audio device that will have a mono audio output. I currently use the PCM5102A stereo DAC in my prototype as it is easy to find as a separate module. But it does have a stereo output,...
artsin's user avatar
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1 answer
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VU Meter with Dot/Bar display driver

I found this(link below) video on Youtube, it's a RGB stereo Vu meter based around (obsolete) LM3915 dot/bar display driver. Since author didn't provide schematics and I want to build something ...
Pararera's user avatar
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0 answers
64 views

Understanding the workings of an ultrasonic sensor

I am trying to simulate an ultrasonic sensor using a ray-based approach. For that, my current process can roughly be described as such: approximate wavefront using rays that mimic the shape of the ...
user23567's user avatar
0 votes
0 answers
54 views

How do you model acoustic waves underwater that are generated by an Nd:YAG laser?

In this paper on page 84 they show the following experimental setup: The array of receiver hydrophones are set up to record sound pressure waves sent by the transmitter hydrophones. In Figure 6....
user1068636's user avatar
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0 answers
35 views

Loudspeaker electro-magnetic waves noise isolation

I read about the magnetic waves created by Loudspeakers, causes noise in electronics circuit. If a speaker is going to be soldered in-place with all other circuit components, how can the noise be ...
user241802's user avatar
0 votes
0 answers
107 views

adding rc filter to cheap sub

I bought a cheap computer Sub to repurpose it as a selfmade gaming vest. The circuit has 2 amplifiers on it, one for the normal unfiltered sound that goes to the 2 speakers, and then the output of ...
sharkyenergy's user avatar
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0 answers
1k views

Can I reduce the volume of an active buzzer with an Arduino?

I connected the Arduino's 5V pin to an active buzzer's positive, and it makes a loud noise. I tried connecting the Arduino's 3.3V pin and yet the active buzzer is making a loud noise. Is there a way ...
theprogrammer's user avatar
0 votes
0 answers
99 views

VU Meter only with 1LED (PWM) no IC except for OPAMP

first of all yes it is homework but I worked on it and stuck at only this part. Maybe I am approaching on wrong side I am open to every advice. I changed the idea in my mind. I want to make a ...
U.Deniz A.'s user avatar
0 votes
2 answers
2k 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 ...
Akshit's user avatar
  • 19
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0 answers
199 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 ...
Vijay's user avatar
  • 101
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1 answer
122 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?
JakeS91's user avatar
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1 answer
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Designing a high frequency amplifier and needing an oscilloscope

I need an oscilloscope to bench test an amplifier I've building. I haven't got any. I thought If I limit it to 20kHz, it can be used as a sound amplifier. Would simply judging by the sound be enough ...
Dehbop's user avatar
  • 279