Questions tagged [sound]

Audible vibrations transmitted through air or other medium

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Remove clicking from speaker [closed]

I am using an Arduino, in order to code some tune. The arduino uses the tone-AC library. However, when a new note is played, the moment it starts playing, a click can be heard from the speaker. This ...
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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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Extracting decibels from wave file

I've been using a Sound Level Meter (Larson Davis 831C) to record bird songs. The device gives me both amplitude readings (Leq and Lpeak with A, C, and Z weightings) with a sampling rate of 50 Hz and ...
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4 votes
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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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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 votes
1 answer
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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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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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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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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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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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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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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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Use TC4427EPA to drive an audible buzzer

I am using a TC4427EPA to drive a piezo buzzer, with two bypass capacitors on the supply voltage, as recommended by datasheet. I have used the same setup to drive a 40 kHz ultrasonic speaker (with a ...
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Proper audio amplifier for a 12W-RMS / 60W maximum speaker

I have two different amplifiers TDA2030A ~ 18W amplifier and a TPA3118 ~ 60W and a medium size speaker labeled 12 watt RMS - 60 watt maximum. I don't know how the RMS wattage is so far different from ...
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How to reproduce these audible clicking or popping sounds? [closed]

My fluorescent lamps (and other devices) are making clicking sounds. I want to reproduce these clicking or popping sounds or get an idea of how one might produce such sounds in electrical devices or ...
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1 vote
4 answers
310 views

Is signal from electret microphone capsule (with FET) inverted?

Can I assume that the signal from an electret microphone capsule is inverted due to common source configuration of jfet? I would like to have non-inverted signal on my sound's card line input. Then I ...
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Mechanically alter frequency of audio from a speaker [closed]

I am a programmer and my knowledge with hardware is very limited. So, bear with me with the question I have here. It may also be a dumb question. in short: Can I apply some mechanical changes on a ...
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1 answer
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How do I calculate the coarse tune and fine tune register values of AY-3-8910 for a desired frequency?

I have hooked up an AY-3-8910 sound chip to an Arduino Nano and I am trying to get it to give me a square wave at a frequency of 440Hz on channel A. The datasheet for the AY-3-8910 says that the ...
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Issues with getting TDA7265 sound amplifier to work with two sound sources

I am trying to make a design that makes use of the TDA7265 to amplify sound. I have already had several iterations where I redesigned and ordered a PCB to test out the design, but each seemed to have ...
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Troubleshoot noise in audio mixer circuit

I have a Soundcraft EPM6 sound mixer. Recently I noticed a click noise in the right channel of a stereo input. The click seems to happen at each period of the sound wave (I feed a 2 Hz signal, and was ...
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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 ...
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2 votes
2 answers
253 views

What happens when an audio JFET amplifier receives signals from two microphones?

I have seen this JFET amplifier circuit in my notebook. It is very possible that it isn't a practical amplifier and that they just tried to teach me about JFET applications, but I have two questions ...
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I built a locomotive and I want to connect a TSU-2200 sound card to it which operates on 3.7 v to 22 v. my system operates on 24 volts [duplicate]

I have built a locomotive, which operates from a 24-volt alternator through a 300 amp controller then to 6, 350-watt 24-volt motors. I have a TSU-2200 digital sound decoder that operates on a voltage ...
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Power-Cut beeping [closed]

I have a device that should stay connected to power at all times. Now when someone unplugs the device from the power there should beeper that goes off for one or two seconds, alerting or reminding the ...
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3 votes
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Why is my 5 pin switching headphone jack shorting out my circuit when I plug a 3.5mm phono cable into it?

I have an STX-3790-5N 3.5mm stereo switching headphone jack in my circuit. http://www.kycon.com/Pub_Eng_Draw/STX-3790-5N.pdf The intention is for the audio signal to flow from the ATmega328 pin 9 to ...
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Wiring left and right channels together coming out of MP3 player module

I have a DFPlayer MP3 module and i'd like to use the dac_l and dac_r outputs to connect to an amplifier. However, the amplifier is mono and i'd like to hear both channels coming out of the speaker. ...
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the sound from the coil when the current is drawn

I have buck-boost converter using a TPS630250(4.2 ->Vin) - (3.3 -> Vout) in my PCB. This buck-boost converter can draw max 4A in buck mode and max 2A in boost mode. While there is no load or ...
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Do almost all modern smartphones use piezoelectric speakers?

Do almost all modern smartphones use piezoelectric speakers for both the ear speaker and the speakerphone speaker? The reason I ask is because I rinsed off my waterproof smartphone (which I've done ...
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1 vote
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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 ...
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2 answers
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Find an amplifier voltage output to match my subwoofer rating [closed]

I have two amplifiers with a subwoofer connected to each one and I was wondering how to check what the output wattage to make sure I don't blow my subs. Since they are two exact same pairs, I'll just ...
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2 votes
1 answer
554 views

Why does volume above 80% break my speaker (PAM8403, 3w 4ohm, 18650)?

I am new to working with electronics and I am building a simple speaker. The Problem The speaker I built so far (poor sound quality aside) stops working if the volume is above ~80%. By stop working I ...
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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 ...
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1 vote
1 answer
176 views

Adding a waveform on top of an LED driver signal

My Background: I have a basic understanding of electronics from undergraduate physics courses and a few high-level digital electronics courses, but basically zero knowledge of anything analog/actually ...
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1 answer
37 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 ...
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-6 votes
2 answers
100 views

Computer Speakers vs. Human Voice [closed]

How do computer speakers compare to the human voice in regards to the range of frequencies they can produce? What is the lowest a human voice can go (either world record or just the average person) ...
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1 vote
0 answers
332 views

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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1 vote
1 answer
83 views

Connecting sensor microphone CM-01B to Raspberry Pi

I have a plan to build a phonocardiogram (PCG) with CM-01B piezoelectric sensors. I found similar research that used the same sensor, but it seems that there is no need to build any additional circuit ...
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2 votes
2 answers
342 views

What is a modern 2sd669 transistor replacement

I have an old Nad 302 integrated amp where one of the 2sd669 transistors is blown. I Cannot find any suggestion on modern replacements. To be honest I am a software engineer and analogue circuits is a ...
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Where does this decibel equation come from, why a factor of 20?

For sound levels, it is said that decibels follow this equation: $$ dB = 20 \log(\frac{p_s}{p_0}) $$ Where \$p_s\$ is the pressure of the measured sound wave (in Pascals) and \$p_0\$ is some fixed ...
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2 answers
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Playing a sound when turning off a circuit

For my project, I am looking to have this (mock-up) circuit play a sound, e.g. the Windows XP shutdown sound, the moment it is powered off. I have looked at capacitors, relays, opto-couplers, and a ...
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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 ...
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10 votes
4 answers
4k views

If we use potentiometers as volume controls, don't they waste electric power?

I recently heard that we use potentiometers to reduce the volume levels in audio devices. Will it waste electrical energy?
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2 votes
0 answers
52 views

Is there an electronic device (not a speaker) that is small and can generate single tone beep [closed]

I'm new to the world of electronics and I'm working on a project where I want to create a circuit to generate a beeping sound but it needs to be as small as possible (< 6mm) to be effective in what ...
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1 answer
451 views

Difference between RMS and PMPO in radio speakers

The radio speakers come with their loudness unit either in RMS or PMPO watt. What is the difference between the RMS and PMPO in sound system?
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1 answer
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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 ...
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