All Questions
137
questions
1
vote
1
answer
88
views
Audio visualizer: What can I improve in this circuit?
Being a beginner in electronics, I embarked on designing and building a sound visualizer, turning bass, mid, and high frequencies into red, green, and blue light in an RGB LED strip.
I designed the ...
- 169
0
votes
1
answer
61
views
How to power an audio-level meter / VU meter in a midi-controller project?
I'm building an Arduino-based midi fader controller, and want to also add an audio VU / Level Meter to the enclosure.
The Arduino is USB-powered.
I bought a standalone audio level meter on AliExpress, ...
- 1
0
votes
2
answers
45
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)?
0
votes
0
answers
51
views
Attenuate 750 mV differential speaker level out to 636 mV line level in
I am developing an Arduino project using an RN52 Bluetooth shield and an Si4713 FM transceiver.
The RN52 has differential (speaker L+ & L-, R+ & R-) speaker level output (750 mV Vpk) and the ...
0
votes
3
answers
136
views
What are these resistors and capacitors doing in this audio CODEC circuit?
I'm implementing the VS1053 Audio CODEC IC on a PCB design where I will be using it along with a class D amplifier that will connect to a pair of 8 ohm speakers. I'm looking at SparkFun's MP3 Player ...
- 1,195
0
votes
2
answers
466
views
How can I read audio output signal (jack) with Arduino?
I am trying to find a way to connect an Arduino board to an USB sound card, equipped with 2 outputs: RCA and headphone jack 6.3mm. I would like to simoultaneously play a sound from one and record the ...
- 1
0
votes
4
answers
240
views
How can I remove DC from an audio signal?
I am trying to "isolate" an audio signal that is transmitted on top of a 24V (DC) power supply voltage.
This construct is used in door intercom systems from TCS.
The audio signal is the ...
- 141
0
votes
0
answers
67
views
Capture audio from TCS Intercom BUS
I try to monitor and capture audio on a TCS Intercom.
There a several projects out there who have revers engineered the bus protocol.
I got it working to see activity on the bus when someone rings the ...
- 141
1
vote
1
answer
112
views
Arduino's impedance in breadboard circuit
(Warning, as this is a long question, asked by students that don't know what they're doing. Perhaps our questions are too general and can't be answered but at this point we'll take all the help we can ...
0
votes
1
answer
119
views
DfPlayer Mini not working when using three LR44 batteries
I'm working on a small project that plays audio. This project uses an ATtiny85 and a DFPlayer Mini as well as some other small components to make the whole thing work. I've tested the circuit using an ...
- 59
1
vote
2
answers
350
views
How to make a MAX98357A class-D amplifier work with an Arduino (ATmega32) to play an audio file?
Is it possible to make a MAX98357A class-D amplifier work with a normal Arduino? I've only found solutions based on an ESP32. If not, why not, and is there a solution or an alternative solution?
- 105
1
vote
0
answers
511
views
Arduino 3.5mm jack output
I am trying to connect general speaker as an output to an Arduino Nano and play some tone.
My vision is:
will connect:
Arduino D8 (digital) output pin to left and right channel
GND to GND
in code, ...
- 11
1
vote
1
answer
216
views
Problem when playing music with Arduino
I am using an Arduino Nano in combination with a SD card to play some music. I have loaded some .wav files on my SD card, the card initializes, everything runs correctly, but on my output pin for my ...
- 63
1
vote
1
answer
348
views
Delay in I2S audio from SD card
This question was already asked on specific arduino forum but I didnt recieve any answers and views were very limited hence I am posting here for better reach.
I am trying to play wav file saved in SD ...
- 525
0
votes
1
answer
104
views
Audio processing from Arduino
The project is to design a device with multiple audio inputs and multiple audio outputs. The device should be capable to map input and output audio channels. Output almost same as the input. At what ...
- 11