Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.

Questions tagged [audio]

Questions about designing electronics for measuring, processing, and amplifying audio signals.

257 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
0
votes
0answers
46 views

Arduino receiving correct audio data from analog input?

I've connected my arduino's analog input to my phone's headphone jack and am trying to visualize the audio data in the serial monitor. I have read on Arduino's site that the Arduino UNO is able to <...
0
votes
0answers
73 views

Add IR (infrared) remote control to simple audio amp?

is it possible to add some kind of a remote control receiver to a basic audio amp board that only has a manual volume knob? The IC chip in the amp board is a TDA7498. A general view of the board is in ...
0
votes
0answers
76 views

Interfacing Audio ADC CS5381 with PICMX250128B

I want a 24 bit resolution AD conversion, so I am using an audio ADC CS5385. I am not in any way working with audio signal, but I just want to get the digital values from the ADC via the I2S interface....
0
votes
0answers
31 views

Mixing audio intercom with music to my earbuds

I'm flying allot and I'm trying to find a way to use my Bose QC20 earbuds during my flights with my aircraft so I can listen to both my music and the airplane Audio. I'm planning to make a microphone ...
0
votes
0answers
20 views

Calculate Capacitor mf for PAM8402 Amp Powered From RPi

Trying to figure out what capacitor mf I should use for a 5v PAM8402 audio amp that is powered by a Raspberry Pi. When the amp is first turned on it triggers the Pi's low voltage warning. I'm using a ...
0
votes
0answers
60 views

LM4890 amplifier and CR1616, how to improve power consumption?

I'm a hobbyst trying to design a simple circuit for amplifying the PWM audio output of an ATTINY85. I'm using an LM4890 (1W amp) and a 1W microspeaker. The problem comes when I supply 3V with a small ...
0
votes
0answers
54 views

Effects of a voltage divider on an audio DAC

Background: I'm planning on using a TI TS5A22364 SPDT Switch with Negative Signaling to connect AGND to the Left and Right Channels of the TI PCM5102A Audio DAC when the DAC is powered down as an ...
0
votes
0answers
39 views

Merging audio lines - one channel is quieter

I'm still learning digital electronics, and analogue electronics is very much a dark art for me. I have the circuit as shown below, the audio output stage for an 8-bit programmable sound generator. ...
0
votes
3answers
64 views

Amplifier Speaker Question

I am trying to learn about audio electronics and built a simple single stage amplifier with a 2N3904 transistor. I play the guitar and know that when you plug an amp into a speaker it's impedance has ...
0
votes
0answers
38 views

Speaker crossover: can wrong ESR cause amplifier to clip?

I have an old pair of speaker I decided to revive. I recapped the crossover with new caps but now my amp keeps clipping when I turn the volume a little bit high (and it was not before). I wonder if ...
0
votes
0answers
23 views

Can we do Karhunen-Loeve Transformation in one dimension matrix?

I have a one-dimensional matrix (that was extracted from the audio data) to process so the noise of the data could be eliminated. A paper told me that I have to use the Karhunen-Loeve Transformation (...
0
votes
0answers
35 views

Tda2822 audio amplifier used for mono signal

I have a signal from an astable connected to 9V which I want to amplify using the TBA2822 amp. The speaker I want to amplify the signal for is 8 ohms impedance and 2 W power. Since the signal I have ...
0
votes
0answers
79 views

What is wrong with this single supply opamp circuit for audio?

I am currently building an output stage for a DAC with opamps, in single supply configuration. Here is my circuit from LTspice: I have exactly built this on PCB, so I am talking about the real thing ...
0
votes
0answers
54 views

iPhone headphone out as a signal source for AM modulation circuit

EDIT: I wonder what is the appropriate model for an iPhone/MP3 player audio out? I imagined it as a voltage source that would support whatever current the resistance it’s connected to necessitates. Is ...
0
votes
0answers
70 views

Custom microphone amplifier poor high frequency response

I've designed and received a custom MEMS microphone amplifier PCB, but am having issues with poor high frequency response and very low sensitivity/gain. Basically the microphone stops picking up ...
0
votes
0answers
50 views

Cannot share power source between audio module and 555 circuit

In this post, I outlined a circuit I was building to activate a solenoid with voice using a small Arduino sound detection module (this one). The output pulses from that module are too short to drive ...
0
votes
0answers
38 views

Electromagnet design for 20Hz-20kHz AC

I am trying to design a U core electromagnet to pluck a ferromagnetic guitar string. The strings would sit at the outside center of the U core. I am wondering if high flux cores are ok for this ...
0
votes
2answers
152 views

Bluetooth receiver combining differential outputs to single ended (LR, N) to one (main) secondary amplifier

Hello I am new to this forum recently purchased a CSR8645 Bluetooth Module I have a Sony MHC GX Music system with AUX/MD Video Audio input (Left Right Ground). But in my CSR8645 ...
0
votes
0answers
38 views

External DACs to 3.5mm jack attached to computer speakers

I have 5 external DACs and 5 Speakers that are being powered independently. The DACs are connected to an Nucleo-f446re microcontroller where will be receiving their data from. For the speakers I am ...
0
votes
1answer
51 views

Basic circuit to turn on LED when input detects signal (for guitar)

I'm looking for a basic circuit snipping which can either turn on an LED or give a positive voltage when input signal from a guitar is detected. Basically, I have an existing circuit where an effect (...
0
votes
1answer
78 views

How to interface a passive inductance sensor output (audio-level signal) with Arduino?

Would like to interface two passive magnetic-inductance sensors output (audio-level signal) with Arduino. The sensor circuit comprises of two wire-wound sensors and has no power. It generates it's ...
0
votes
0answers
42 views

How to change channel to in0 to in1 after 1 convertion

I am using stm32f103c8t6 board, using in0 to in3 4 channels for getting information from other hardware. i am new to stm32 so I don't know how to change the channel from in0 to in1 after 1 convertion. ...
0
votes
0answers
43 views

Odd Ground/Power(?) issue with Mixing Desk - alternate grounding?

I am a bit stumped with this one. Unfortunately there are a few variables involved, but I will do my best to ask an answerable question.... I just built a DIY synthesizer. It functions absolutely ...
0
votes
4answers
71 views

simplest way to create an activatable alarm on a speaker?

I have made a circuit that produces a 3.3V high when its active and 0V when it is off. Now I would like to extend it with a speaker that plays some sort of alarm (although it shouldn't be too ...
0
votes
0answers
98 views

Connect DAC 12 bit (STM32F429) to audio line in of class D amplifier

Is it possible to connect the 12 bit DAC of STM32F429 directly to the audio in of XH-M189 amplifier module (for example)? What precautions must be taken into account? The connection of DAC to XH-M189 ...
0
votes
1answer
68 views

How to mute microphone in 2-way communication when the speaker is active?

I'm making my own two way intercom for my house. There will be a speaker and microphone above the front door of my house (as well as a camera). When someone rings my doorbell, I get a notification on ...
0
votes
1answer
37 views

TWO 3.5mm AUX sockets to ONE 3.5 AUX plug - Car Audio Application

I am putting together a car audio system and replacing the factory stereo with a new aftermarket head unit that has a single aux input. The vehicle comes with a single OEM aux input jack in the dash. ...
0
votes
2answers
37 views

Battery to replace by adapter

radio having DC 7.4 V 1000 mA battery, giving 3 hours back up play back. Now want to replace battery and directly on DC adapter and do not want back up, but plug and play. So what should be the ...
0
votes
0answers
83 views

A question about generating low frequency sine waves by a soundcard

As a part of a bigger experiment I need to control the frequency of a speaker by a PC through a MOSFET amplifier. The rest is someone else will use that speaker output for some mechanical application ...
0
votes
1answer
623 views

How to interface to a PDM audio source?

I hear about this technology, I read about it, I even see a bunch of MEMS microphones with PDM output. I can perfectly understand how it works (I have worked with DSP). However, I can't seem to ...
0
votes
1answer
61 views

Identity and advice on replacement of SM diode

I have a Sonos Play:3, which is past its warranty. I dismantled it to find it has the well documented fault with a blown capacitor. However, there is also damage also to one of the surface mount ...
0
votes
1answer
58 views

Wiring an audio jack to obtain soundwave signal

I have recently gotten a piece of MLX 87279 audio jack. It seems to be an old discontinued piece but have managed to find its schematics online: https://www.molex.com/pdm_docs/sd/872791501_sd.pdf ...
0
votes
1answer
56 views

Ohm's Law in Practise

When the AUX pin of a stereo is connected to my mobile phone's audio female port, I just measured the voltage at the end of this AUX pin(No load is connected) approximately 2mV using a DMM . But when ...
0
votes
0answers
96 views

Audio power amplifier circuit explaination

This circuit: My goal is to modify this circuit to operate in DC mode. Got this circuit on the web, but there is some part of it that I still don't get how it operates. T4/T5 is an adjustable ...
0
votes
1answer
329 views

Sound Chip Audio Amplification Circuit YM2612 + TDA1308

I've been working on a project for connecting a Yamaha YM2612 to an arduino and triggering sounds to be played from the chip. I'm having trouble on the audio part of the circuit. I've worked out a ...
0
votes
0answers
142 views

Low-Pass Filter Selection and Placement in Active Noise Cancellation

This continues in the same vein as my previous question - I'm working on an Active Noise Cancellation circuit to get rid of highway noises in my bedroom. Based off an ANC circuit pictured below, I ...
0
votes
1answer
160 views

MOSFET analog switch, Transmission Gate, Bilateral switch circuit questions

Below is an LTSpice simulation of two attempts at a Mosfet bilateral switch or 'transmission gate'. The plot shows the switch (onoff) going from 0 to 5v (in blue) and a sine wave audio signal being ...
0
votes
2answers
306 views

Hummm Sound from stereo speaker when used on inverter

I have a normal 2.1 Stereo speakers with an aux 3.5 cable coming out as input source, i plug this aux cable to a source when needed else it remains hanging, whole speaker this is plugged in to an ...
0
votes
2answers
135 views

Shutdown amplifier when headphones are connected

I'm designing a board for a diy synth, one of the circuits consists in a audio amplifier that drives a small 1W speaker. The amplifier takes the signals from a Raspberry hat(a Fe-Pi Audio V2) and I ...
0
votes
1answer
75 views

Removing switching artifacts from commercial audio amplifier

I got an audio amplifier but I have problems with that. How to remove switching noise(artifact) from the output of Behringer iNUKE NU1000 Power Amplifier ,Audio amplifier? please find I got from ...
0
votes
1answer
177 views

Inverting Second Order Filter

I am working on an audio filter, and my goal is to filter out noise below 90Hz and 20kHz (the range of my speakers). I will have some nearby circuits running at 25 to 30kHz, so I have decided to go ...
0
votes
1answer
72 views

Bypass Gate-to-trigger-converter via switching jack

Goal I like to trigger a LF398 Sample-and-Hold IC via a 3.5mm Jack (modular synthesizer). The desired behaviour would be: if a cable is plugged in, incoming signals will be converted to short ...
0
votes
2answers
68 views

Symmetrical power supply: Rail fuses useful or dangerous?

I'm designing/testing power amp stuff with symmetrical power supplies (43V-0-43V). In the next future I'm planning to control all safety/healthy stuff (like over current / over voltage / temperature ...
0
votes
2answers
262 views

DC voltage ripple help

I am new here and I realy need your help. For diplome at the end of my studying I am making the audio amplifier module (power amplifier, preamplifier, tone control, power supply, linear regulator) all ...
0
votes
0answers
323 views

whats the difference between a cascaded band pass filter and a normal band pass filter (Audio visualizer)

simulate this circuit – Schematic created using CircuitLab currently im building an audio visualizer i would like to know what is the difference between a cascaded 2nd order band pass filter ...
0
votes
0answers
276 views

Using 2N3904 NPN for audio amplification

I use a great library ESP8266Audio for play audio using ESP8266. As the author explained we can use 2n3904 for audio amplification as follow: ...
0
votes
1answer
182 views

Op-amp control theory

back at it again trying to use your genius brains. I have been trying to teach myself audio amplifier design. The big road block I am getting into is the control theory part of it, meaning how does ...
0
votes
0answers
69 views

Constructing a reactive lighting system?

I've recently written a Matlab script to develop/simulate PWM output for RGB lights based on sampled audio input. I made this script with plans to actually construct a device that can run the ...
0
votes
2answers
282 views

BA3121: Ground loop supression is great however very thin audio quality

Recently I bought a couple of BA3121s to fight the annoying ground loop problems when using several/separated modules (MCUs, BlueTooth, USB etc) in class-d amplifier audio projects and all the modules ...
0
votes
0answers
122 views

Building a simple line out from a mcu DAC

I'd like to get audio (specifically a line out) from a Cortex-M4 10 bit DAC (LPC-4337). The dev board I'm using already has a 470 Ohm resistor in series with the DAC. Since I've never worked with ...