Audible vibrations transmitted through air or other medium

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0
votes
2answers
40 views

Buzzer vs piezo sound for generating sound

Correct me if i'm wrong. Buzzers can only produce 1 tone but are quite loud. While piezos can generate a wide variety but are most suited to ics. Is there anything i missed?
-1
votes
1answer
41 views

Custom sound recordings to play over loud speaker when MOTION is detected

I'm thinking, a PIR, with a RELAY, but don't know of a device I can trigger/drive to play /loop through sounds over a semi loud speaker to scare a away a coyote...Unemployed , long time, little money ...
1
vote
1answer
25 views

How to using a 3.5 mm stereo plug mic with a EM11G LM 386N-1 amplifier

I have built a simple amplifier circuit using a EM11G LM 386N-1 amplifier chip which follows the following design (cap and resister values are slightly different): I connected this mic to the ...
3
votes
1answer
143 views

What is IP and NK transformation (seen on earphones)?

By the side of my earphones, there's a switch that flips between two initials, IP and NK. This Quora question suggests that this is the IP / NK transformation, which somehow makes the earphone ...
0
votes
1answer
47 views

Calculating SPL from voltage output of a microphone with MAX4466 amplifier

I'm using Electret Microphone Amplifier - MAX4466 with Adjustable Gain and I'm getting the output voltage ranging from 1.5V to 3V (which, to my knowledge, is already amplified by MAX4466). I know that ...
1
vote
2answers
115 views

can I understand which way sound comes from?

Is it possible to understand which way sound source is located with using microphones? I was thinking using multiple mikes pointed out different ways and getting db differences to predict direction. ...
0
votes
2answers
75 views

Analog Peak Filter

I'm currently working on a project building headphone and to had to build filters to cancel certain unwanted frequency. While researching and working on it, i came across a reference design which ...
0
votes
1answer
36 views

Lower sound from 1st input when second input has sound

I'm looking for an IC/device/... that can switch between sound inputs. Lets say that I play music through audio jack 1, and a GPS is connected to audio jack 2. I'd like the IC/device to lower/kill ...
0
votes
1answer
49 views

Guitar Pedal not functioning at all, no sound created

Ok, so I'll do my best to explain my situation. (FYI, I am a beginner) I'm building an overdrive pedal for a school project which I plan on modding with the help from a teacher. However, I thought I ...
3
votes
1answer
36 views

How can I mitigate SNR or THD for audio codecs?

During my studies at university, we didn't go too in depth about Signal to Noise ratios (SNR) and Total Harmonic Distortions (THD). I've been trying to work with audio codecs for some time and I only ...
1
vote
1answer
50 views

Sound combination using op-amp

I work on a project where i need to combine sound that comes from audio jack input (let say from tablet) with a sound we create from an MCU with DAC. So it basically means I need to sum the sound of : ...
2
votes
2answers
73 views

Does a sound card low pass filter input?

I ask this question just because I'm curious to find out. As far as I understand, the Nyquist theorem says that the sampling frequency must be at least twice the bandwidth of the signal to be ...
-2
votes
2answers
95 views

How might one connect a laptop's aux out to an oscilloscope?

I am using an online pure tone generator (which generates sinusoidal sound waves) on my laptop to output sound. The AUX-out jack on laptops outputs sound in analog rather than digital signals. Unless ...
2
votes
2answers
91 views

Is it possible a microphone sounds different when user hold it(or not)?

I am a computer-science student working on a signal processing project on smartphones based on recorded microphone signals. For my project, I need a really "reliable" recorded signal. The system works ...
0
votes
0answers
52 views

What causes high pitched sound/beep/buzz from TLC5940PWP chip?

I'm using two daisy chained TLC5940PWP chips to control 32 LEDs from an ATmega32U4 MCU. When PWM'ing the LEDs in software from 0-4095, I hear high pitched sounds/beeps/buzzes, but I would like the ...
-1
votes
1answer
71 views

Question regarding simple preamp+audio amplifier

simulate this circuit – Schematic created using CircuitLab simulate this circuit Hello,as you can see,I constructed a circuit which consists of an amplifier(first scheme) and a ...
3
votes
3answers
716 views

Types of decibels

Why we use dBA or any other type of decibel unit instead of basic decibels unit (dB)? Why we have so many types of this unit?
2
votes
1answer
75 views

Protect soundsystem from GSM/GPRS pulsing noise sounds [closed]

What is the best way to isolate soundsystem from an modem/cellphone to not hear pulsing noise sounds when GSM/GPRS communication is active.
1
vote
1answer
109 views

Negative voltage ADC and op-amp

I have this circuit and I am running code on the raspberry pi which checks the input pin continuously and converts the 10-bit digital signal to a readable voltage. So I can accurately see the voltage ...
0
votes
1answer
126 views

Arduino Recognizing pre-recorded sound clips from an audio stream

My project is to control a Nintendo 3DS hand held video game system from my Arduino Mega. I have all the basic controls wired up and working well. I need to be able to recognize the state of a video ...
2
votes
4answers
760 views

is sound produced by varying current or voltage?

In a sound system (computer, stereo, CD, etc.) is the (just) current or voltage (and therefor current) modulated to create the output to the speakers? If the answer is both, what are some examples of ...
2
votes
2answers
121 views

What is the simplest way to play a sound or wav file?

I'm pretty new/noob with electronics. I'm trying to reproduce a sound (I'm using Proteus as simulator) in a circuit. I wasted hours of looking for but I can only found solutions with Arduino or ...
0
votes
1answer
64 views

dB A and dB Z (or dB SPL) Table

Does anyone have a detailed dB A to db Z (or dB SPL) table? I have found one at http://www.cirrusresearch.co.uk/blog/2011/08/what-are-a-c-z-frequency-weightings/ and at ...
0
votes
1answer
117 views

Convert dB A to dB SPL

I am trying to calibrate an audiometer that gives outputs in dB SPL. However, the sound meter that I am using to calibrate the audiometer registers in dB A. Is there a formula to convert from dB A to ...
-1
votes
1answer
110 views

How to connect speaker cables via S-Video plug [closed]

I would like to buy a speaker system consisting of an active subwoofer and two satellites. From the photos I can see, that the satellites are connected to the central sub using supplied cables with ...
0
votes
1answer
192 views

How to connect 3.5mm Stereo to crystal radio

I'm attempting to build a crystal radio according to the following schematic: Rather than attaching a piezo electric earphone as shown, I would like to hook the radio up to a stereo amp using a 3.5 ...
1
vote
1answer
160 views

Why does my AY-3-8910 sound so distorted?

I'm building a circuit driven by an Arduino UNO that controls a AY-3-8910 programmable sound generator. The AY has three pins ...
1
vote
1answer
67 views

Is it possible to generate a tone using an LRC circuit?

I've been thinking about the possibility of hooking a resonant LRC circuit to an amplifier and hearing the oscillations as sound, hence making it possible to make music instruments using these ...
1
vote
2answers
131 views

Converting Pulses to Analog Input for Mic

A continuation of this question. I am attempting to read two flow meters through the mic port of a phone/tablet. The flow meters' pulse pins toggle between +0V and +5V as their pinwheels rotate. I ...
0
votes
1answer
89 views

Troubleshooting a soundcard oscilloscope that doesn't appear to affect the computer

I'm attempting to build a soundcard oscilloscope, but my computer doesn't seem to be reading the voltage on the audio jack plugged into it. I'm using an Acer laptop (product ID ...
7
votes
4answers
375 views

Counteracting Sound Card AC Coupling for Reading Digital Data

Disclaimer: I am new to EE. Everything I have learned so far I have taught myself from reading online and posting questions like this while working on this project. I apologize if I do a poor job of ...
1
vote
2answers
228 views

Audio Jack Sound Signal?

I was experimenting with my laptop's audio jack port (the headphones one) and something that blew my mind happened. I took an AUX to AUX cable and connected it my laptop (so I could easily have access ...
0
votes
2answers
625 views

Can I use 2n2222 transistor instead of c9013 transistor in a vu meter?

I am building a science project for my friend. We chose to make a VU Meter. I am planning to make the Vu Meter as the schematic in the image: The audio source will be 3.5mm jack output of a ...
0
votes
2answers
58 views

Ratio of two RMS values in recorded audio

Hey guys quick(ish) question: I produce music and am having a discussion on the difference between two RMS values in a specific record (Nero-- The Thrill (Porter Robinson Remix)). In the verse, the ...
0
votes
4answers
155 views

Frequency to dB

As I understand for a sound wave the intensity is determined by the amplitude, frequency and properties of the space, but for amplifiers I have seen that the gain is expressed in dB and is a function ...
0
votes
4answers
312 views

how much energy is required to create a sound with constant frequency and amplitude?

Ok, this is a theoretical question, (Forgive my poor English, I am not a native speaker). Lets assume that I have a power-source with p unknown. this power-source provides energy to a speaker to ...
1
vote
1answer
171 views

What is the best way to play music through speakers

I have these speakers I recovered from an old iPod dock. I want to hook these up to a big remote control truck I have but I have never worked with playing music. What is the easiest way to get ...
5
votes
4answers
769 views

Audio signal trying to go back to zero zeroes

I created a two differrent signals on my android phone, one to act as the clock signal (lower signal), and the other to be the data signal (lower signal), but the problem is that the audio the signal ...
-2
votes
1answer
72 views

What could cause sound system to occasionally become weak and mono until clicking 'Test' in Windows? [closed]

edit I am not looking for a repair, I am trying to learn about what could cause the strange behavior simply for the sake of science. Ok so I have an old Yamaha sound system that is mostly broken ...
3
votes
2answers
2k views

Creating a loud cracking sound to scare cats away forever and ever

So we have some hardcore cats in our area, recording their glorious conquests with excrement. They don't scare easily. I'll be conducting psychological warfare, they must start associating some form ...
0
votes
2answers
113 views

Possible to imitate a wolf's howling with a simple electronic circuit?

I would love to build a small circuit board that outputs something that sounds similar to a wolf howl to a small speaker. With "simple", I mean I would prefer if I could use simple components such as ...
5
votes
1answer
183 views

Custom WAVE file results in different sound profile than created

My problem is as following: I'm trying to use my sound card to produce a custom repeating wave pattern which I will use in some laboratory test setup. My curve is based on a combination of a couple ...
1
vote
2answers
227 views

What is the simplest sound-reacting led circuit?

A few years ago (around 3 years) I've made a very basic circuit to make a led blink to the sound. The circuit a single regulator connected to a USB port to extract 5V, with a 3.3V led, conected to a ...
7
votes
5answers
5k views

Can computer speakers emit ultrasound?

Can computer speakers emit ultrasound? What is the maximum frequency that computer speakers can produce?
5
votes
2answers
430 views

Limits of my Arduino <-> Smartphone communication

I want to transfer signals from my smartphone to my Arduino Uno by using the audio jack. I have directly connected one channel of the audio to the analog in on the board. The smartphone is sending ~ ...
0
votes
2answers
155 views

How to create this opamp circuit for mind machine

I'm trying to create a circuit to blink lights at the precise frequency for a mind machine. The lights need to be in sync with audio. Audio channel 1 300 hz Audio channel 2 310 hz The led needs to ...
0
votes
4answers
294 views

Sound Chips for attiny [closed]

Is there some kind of chip ( that doesnt use an SD Card ) so i can play prerecorded sounds using my ATtiny? I'm talking about the kinds of things in toys like Zoomer and furby etc
5
votes
1answer
884 views

FFT Beat Detection Circuit

I have for over a year now tried to figure out both the electronic aspect and the software aspect of my project. I have somewhat successfully managed to make the overall idea to work, the bumps I ...
0
votes
1answer
64 views

Voltage at netbook's earphones output. [closed]

Is there any standrad that specifies max voltage at earphones output in netbooks? What values can I expect, can it be 5V or rather 1,8V ? Is there any way to monitor current (current I mean adjective, ...
2
votes
1answer
53 views

Switching tone on and off at 120 bpm not working

I am trying to make a design that toggles a sound at a rate of 120 BPM (once every .5 seconds), and I am using a 50 MHz clock. Here's the tone module: ...