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Questions tagged [audio]

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

0
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2answers
29 views

Making a wireless lavalier microphone with ESP8266-07

I'd like to make a lavailer microphone and receiver using two ESP8266-07 Wifi modules. I'm using a condenser microphone with it's own preamlifier using 5V. I want to compare my signal with 300kHz ...
0
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0answers
28 views

how would a non inverting op amp tone boost work?

I'm modifying an audio circuit to add more tone controls, and found a method I want to try. It involves separating the wanted frequencies into a boost circuit and the less wanted frequencies around ...
2
votes
0answers
45 views

Designing an audio amplifier, problems with bandpass filter

I am trying to build a Audio amplifier for a university project, I think that most of my circuit is done but I have an issue with my filter as my sine signal is not symmetrical after filtering to ...
0
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2answers
43 views

Microphone gain with LM386

I am trying to amplify audio from an electret microphone using an LM386 audio amplifier board. However, the output of the board is very grainy and the audio is distorted. Is there any way I can ...
0
votes
1answer
30 views

Calculating the efficiency of an audio amplifier

I'm looking at the PAM8406 Class-D/Class-AB amplifier and I'm not seeing the efficiency for a 2Ω load in Class-AB mode. The use case for the amplifier is driving mid-range/mid-bass speakers for ...
0
votes
1answer
68 views

How to measure the output impedance of a valve preamp?

I was trying to measure the output impedance of a DIY preamp for the past couple of days without any luck. Each time, I got to the same result of around 3K3 ohm, which is unbelievably low. This is ...
0
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2answers
26 views

Adding a potentiometer to an LM4910 as a volume control

Can someone tell me where I need to place a potentiometer to control the volume in this LM4910 amplifier circuit? Does the shutdown pin need a pull up resistor to enable the IC?
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0answers
20 views

Project involving the Texas Instruments TAS5720 amplifier - Power Requirements

The Google Home Mini uses the TAS5720 amplifier with a power supply which delivers 5V DC, 1.8A. From the datasheet it looks like this amplifier can deliver 20 W at 0.15% THD Continuous into 19 V / 4 Ω....
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2answers
41 views

I2S MCLK Generation

I'm working with a Sierra Wireless BC127 (Bluetooth Module) I2S master which is generating Left-Justified, 16 bps @ 44.1khz sample rate. The Bit clock is set to 2.822 Mhz. I want to use a Cirrus ...
-1
votes
0answers
24 views

Low power headphone amplifier circuit [closed]

does anyone know schematics of a headphone amplifier, I have a mono signal from a microcontroller and I need to amplify the signal to a headphone. the device is 2000mah 3.7 li-po battery powered. ...
1
vote
3answers
84 views

Audiable pops when switching DC biased audio signal

In my previous question, I have asked how to DC bias audio signal for a crosspoint audio switching matrix (Switch array (crosspoint) and DC biasing of audio signal). I am using the following circuit ...
1
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0answers
34 views

Audio Amplifier Power Usage

I'm looking to add an audio amplifier to a circuit, in this case the TPA0211 in 5V mode for a full 2W of output. My rather dumb question is this: I should expect at least 400mA of current draw from ...
-1
votes
0answers
34 views

Problem with ground loop in audio system? USB and minijack at the same time [closed]

My hardware setup is: PC with external USB audio card + smartphone. Smartphone is connected via USB to PC and via minijack to USB audio card at the same time. Problem doesn't appear when I disconnect ...
0
votes
0answers
43 views

Single-ended to differential audio preamplifier for low impedance power amplifier [closed]

I'm searching for a suitable IC solution to handle four audio 4V single-ended input signals and get for each of them, a differential output signal (with the possibility to have a gain) to drive an OEM ...
1
vote
2answers
149 views

Why don't they use more than 12v in high power car audio?

In every single high-powered car audio system I've seen, in person and on the internet, the amplifier has been run off of the main 12 volt power system. Such systems feature multiple parallel runs of ...
0
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0answers
36 views

Convert raw data recorded in python with sound card (ADC) to input voltage Vin

I am trying to convert the ADC output code recorded using the sounddevice module in python back to its physical voltage quantity, i.e trying to calculate Vin in my sound card's input. I am using a ...
0
votes
1answer
53 views

Need help understanding how this decoder IC & differential amplifier circuit works

I need help to better understand differential amplifiers, when interfaced with an decoder IC. For the circuit below, which is from the reference design here: It shows a mono differential amplifier (...
0
votes
1answer
44 views

Choosing usb-c earphones that are lossless? [closed]

I know the USB-C audio standard support multiple compression standards, some lossy, some lossless. Can i control this in software or hardware ? how can i choose earphones that will guarantee ...
0
votes
1answer
30 views

SQNR and Dynamic Range

An audio tone \$Acos(\omega t + \theta)\$ undergoes uniform quantization by a quantizer that has the average quantization noise power \$q^2/6\$ joules, where \$q\$ is the quantization step size. If ...
0
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0answers
40 views

Line level audio output from headphones level output

I am new to analog audio interface design. I am trying to get a line level output from a amplified headphones level output. I want both of the output to work at the same time in order for the user to ...
0
votes
0answers
26 views

Remove Echo in an Op Amp

I have been working with a distortion circuit that has an op amp amplifying the volume before sending it through the diodes. The op amp is configured as a non-inverting op amp with a feedback resistor ...
0
votes
1answer
59 views

Where to begin with programming an audio interface driver?

I'm designing my own mic/line preamp (the analog portions) and would like to have it interface with a computer in a send-return fashion as well (like any typical audio interface). I've noticed that ...
1
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0answers
35 views

How to Low-Pass PDM Output Data

I have a PDM-Mems Microphone which provides me with 101010 data, the Microphone has a Clock of 3Mhz. I read the manual about how PDM is generated, but I haven't worked with digital filters yet and in ...
0
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2answers
101 views

LM358n versus LM386 for audio amp

Here's the pinout diagram for an LM358 Here's the pinout diagram for the LM386: Here's a very basic circuit showing an audio amplifier created using an LM386: If I built the equivalent circuit ...
0
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0answers
41 views

Negatively offset signal on op-amp

I am simulating the use of a tl074 quad op-amp and i have configured one of the op-amps as a non-inverting op-amp, where R1=1 Meg and R2=4 Meg and the supply voltage is 9V. Every time i put a signal ...
0
votes
0answers
47 views

Is normal SPI device compatible with SPI I/F?

Audio controller AK5374 that I use requires EEPROM with SPI. However, in the specs it is written, that it communicates with EEPROM via SPI I/F. Will normal EEPROM be compatible with this interface?
0
votes
1answer
52 views

Noise when amplifier and chromecast share a power supply

simulate this circuit – Schematic created using CircuitLab I want to power a chromecast and an amplifier from the same power supply. When the dc/dc converter is powered by a separate power ...
0
votes
1answer
76 views

Query regarding unknown component

Hi guys I'm very new to this field and I'm having a problem with my sound devices 664 recorder. There's a faulty component and it needs to be replaced. I couldn't find the component here in the local ...
1
vote
1answer
41 views

Standard Connector for Audio Line Out

I have to give audio Line Out in my project. I don't know which connector I have to give this out. I have found that in PC, 3.5mm Jack is used for line in and line out. Also found that RCA jacks have ...
3
votes
4answers
774 views

Is there an efficient way for synchronising audio events real-time with LEDs using an MCU?

I'm working on a project in which LED lights synchronise with audio events. I'm not referring to reactive LED projects that read the ADC from audio amplitude or spectrum, but about having some ...
0
votes
1answer
50 views

Switch array (crosspoint) and DC biasing of audio signal

For a project at my university, I am making a guitar effects switcher. Guitar effects work on instrument level audio signal which is AC only. I plan to use ADG2128 analog switch array (https://www....
0
votes
2answers
64 views

Simplest option for generating audio tones?

I'm looking for the simplest way to generate audio tones. Something like a square or sine wave, but I want multiple tone options. For example, two quick beeps, one at 440Hz, one at 1Khz. The tones ...
0
votes
1answer
72 views

Translating/reverse engineering firmware commands

I'm trying to build my own Hi-Fi system. So, I recently ordered this Japanese DSP that's able to process Dolby audio. I was all excited until the part had arrived and I found something in the ...
0
votes
1answer
46 views

Volume Control for Mixer Circuit using DAC Refence

I am mixing two stereo audio signals together and would like to control the output volume using the (0-3.3v) DAC on my microcontroller. I'm wondering if there is a simple modification I can do to this ...
2
votes
1answer
75 views

Output Filter Components Breaking Class D Amplifier Chip

Hi I am designing a class D amplifier PCB using the TPA3122D2 amplifier chip. I am planning to base my circuit on the schematic from the evaluation board: I bought components of the same values given ...
0
votes
1answer
91 views

How do I calculate expected output voltage of car audio amplifier with given conditions?

I have a 4-Channel Amplifier rated at 800 Watt RMS per channel @ 2 Ohm load. Channel 3 and 4 are preset to operate a subwoofer speaker while Ch 1 and 2 are set to operate mid-range speakers at ...
0
votes
1answer
31 views

How to Choose Proper Components for Class D Amplifier Circuit

Hi I am designing a class B amplifier PCB using the TPA3122D2 amplifier chip. I am planning to base my circuit on the schematic from the evaluation board (see below). I have tried building out this ...
1
vote
3answers
116 views

Trying to recover audio from PWM

I am trying to make a Raspberry pi Bluetooth receiver. I finally got the raspberry pi to output audio via bluetooth, however the output seems like it is a modulated PWM. The width of the PWM seems to ...
0
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0answers
33 views

Identify relevant parameters of Transformer Spec. for Audio Application

Upon the advice of this question/answer I have added a 1:1 audio isolation transformer to my circuit. I picked up a transformer at the local radio service shop and dropped it into my bread-board ...
1
vote
1answer
26 views

Handling Phase Shift with ANC

I've been working on a circuit to do active noise cancellation, but I'm worried about controlling the phase. Here are my assumptions, and I'd love some help understanding 1)what of my assumptions are ...
0
votes
1answer
62 views

Isolate two audio inputs to amplifier circuits on ground connection

I am using an arduino to monitor the voltage of the input lines to a stereo amplifier connected to speakers. When the arduino detects voltage changes on Chan1 or Chan2 it activates an IR LED to change ...
0
votes
0answers
41 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
3answers
127 views

Is it possible to play music with a PIC16F628A

Is it possible to generate and send PCM audio from a PIC16 (or an arduino/atmel)? It does have an analog port, so it should work right? And if it does, is the PIC fast enough to generate the ...
2
votes
2answers
205 views

Device to loopback mic to headphones

I have an issue with my headset. I can’t stand not being able to hear myself speak. I’d like to build a passive device to loopback the mic to the headphones that would be plugged in-line between the ...
1
vote
1answer
38 views

Lpad wiring, is gnd needed?

I'm building an attenuator using an Lpad. Do I need to connect '1' to GND? What difference will it make? Here's my circuit (Fritzing didn't have mono-jack connectors or an Lpad, so I'm using the ones ...
0
votes
0answers
28 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 ...
1
vote
0answers
74 views

Low latency wireless audio transmitter

I am working on a project that requires low latency wireless point to point audio transmission at short distance using a digital transmission technique (ideally 24bit 96khz audio, 30 metre max) at a ...
2
votes
2answers
62 views

LM386 speaker distorts

I've built an amplifier with an lm386 but when I connect a speaker (8ohm) to the output I get a very distorted signal. The problem appears only when the speaker is connected. If I connect an external ...
0
votes
2answers
127 views

Stereo I2S To USB Audio

I have searched for a way to convert an I2S stream to USB audio and have only managed to find USB to I2S, not I2S to USB. Please advise me as to how this is possible.
5
votes
3answers
1k views

OP Amp not amplifying audio signal

Hi, part of my project requires me to amplify an audio signal coming from an electret condenser microphone which outputs an average of 10mVpp to approximately 2.5Vpp. I Used two cascaded non-inverting ...