Questions tagged [audio]

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

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Building subwoofer into a car audio system [closed]

My buddy has a car audio system and wants to connect a subwoofer to it. We would like to do it ourselves but are not sure how to proceed. What we have is: Car radio Subwoofer Cable with connectors ...
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  • 47
2 votes
1 answer
28 views

Control PWM Volume

I am using Arduino's tone() function to produce some basic tunes. However, tone() does not have volume control. I did post about ...
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1 vote
2 answers
61 views

Benefit of fully differential amplifier

I am trying to build an audio amplifier PCB with S/PDIF and single ended line level inputs and want to use the CS42528 CODEC (datasheet). My questions are regarding the input and output stages of this ...
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0 votes
1 answer
39 views

Compact relay banks [closed]

I'd like to switch about 20-30 audio signals. By "audio", I mean non-DC that is low-voltage (<5V peak) and low-current (<50mA peak). I'd like this switching to occupy the smallest ...
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  • 139
1 vote
2 answers
84 views

Testing an audio amplifier using a signal generator?

How do I test an audio amplifier using a signal generator? For example, I would like to input a 440 Hz sine wave and listen to the speaker output at various configurations of volume, etc. watch the ...
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1 vote
1 answer
48 views

How would I have to modify this headphone amp circuit to increase the output power of one channel?

I'm currently trying to repair an old Sony TCD-D7 DAT-Walkman. It suffers from unbalanced audio output. The right channel is much quieter than the left one during playback. The headphone amplifier ...
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  • 401
1 vote
2 answers
51 views

Twin-T notch filter with high input impedance and low output impedance using one op-amp

I have a very space and power constrained application, where I want to apply a twin-T notch filtering to an audio signal and add a little gain of about ~10x. The following filter section has the ...
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  • 11k
0 votes
0 answers
97 views

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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3 votes
1 answer
123 views

Safely connect audio line level input to ADC

I'd like to take an audio line level signal and feed it into the ADC on a microcontroller (perhaps an rp2040, maybe a nodemcu, haven't decided yet), and feed that into an FFT for visualization ...
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0 votes
0 answers
100 views

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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  • 1
0 votes
1 answer
73 views

Humming sound when not touching wire

I explained this problem in a video so you can see with your own eyes the problem... touching the GND wire makes the problem go away, however touching the signal wire creates the problem. Even ...
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0 votes
1 answer
23 views

Wiring a headset with push-to-talk functionality to a standard TRRS connector

I have a headset with a push-to-talk (PTT) functionality that uses a "Kenwood" 2 pin connector. I would like to create an adapter so that it can be used with devices that support standard 3....
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  • 103
0 votes
2 answers
57 views

Mono headphones to stereo jack

I'm in the middle of a project to adapt a mono aviation headset to a 3.5 mm plug. The headset is mono, the plug will be stereo. Can I just connect both L & R together and connect to the audio of ...
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  • 101
0 votes
2 answers
51 views

Convert speaker level to microphone level

I have a digital piano without line output (not even earphone output) but I would like to record what I am playing. So I decided to convert the speaker level to mic level so I can record the audio in ...
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0 votes
1 answer
52 views

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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  • 11
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2 answers
59 views

Calculating audio amp output impedance and other general questions [closed]

I'm 3rd year EE student and I am now doing a project where I'm basically making a supersensitive metal detector using solenoids. Solenoid has about 9 ohm resistance with inductance about 13 mH. ...
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3 votes
1 answer
67 views

How can I monitor the CC lines on USB-C port?

I need to develop a device which has a USB-C port. This port has two purposes: One can connect a USB charger to charge the battery of the device One can connect USB headphones to listen to some music ...
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  • 33
-1 votes
0 answers
83 views

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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0 votes
1 answer
50 views

Connection of microphones to Stereo Audio Codec

I want to interface two electret microphones with a stereo audio codec. One mic will capture audio from one side of a box and the other one from the opposite side. I want to use TLV320AIC3254 from ...
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0 votes
5 answers
176 views

How to decrease distortion and efficiency of this circuit?

How to achieve efficiency of more than 70% and decrease the distortion of the circuit to 0.1% in THD, without affecting my Vpp=30 with the circuit below with both in 1k and 6k frequency of Vs? Update ...
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0 votes
1 answer
115 views

Designing a two stage push-pull class B audio amplifier

I am designing a two stage push-pull class B audio amplifier with s 2N4401 used as my pte-amplifier stage and TIP31C & TIP32C as my push-pull stage where my RL is a 10W speaker. I am trying to set ...
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0 votes
0 answers
39 views

Creating a line level signal and DC power from a speaker level signal

I have a speaker connected to an amplifier with some wires that run through a wall. I may want to replace the regular speaker with one that has an integrated amp and takes a line level audio input and ...
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0 votes
0 answers
67 views

Problems with no signal amp

I am making a project witch have processing of an audio signal with a microcontroller. This signal I filter and then I need to play in a speaker. Because I don't have many experience with amps and ...
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1 vote
2 answers
188 views

Designing an audio amplifier with push-pull output stage

I'm working on a push-pull stage audio amplifier. I'd like your opinion on whether I'm on the right track with this, both theoretically and practically. In this circuit I'll be using the following ...
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6 votes
3 answers
1k views

Big capacitor on amplifier output

I am currently making an audio amplifier and I was wondering what is the use of the capacitor C5. I think it's here to avoid having DC voltage in the speakers when switching on the amplifier but, I'm ...
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  • 63
1 vote
0 answers
33 views

AM modulation: bandwidth of sidebands? [duplicate]

I’m trying to understand how an audio signal is represented with electrical signals and modulated. I and have questions which follow. Wikipedia says An audio signal is a representation of sound, ...
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  • 335
0 votes
2 answers
50 views

Is there a power amplifier class called "bridged"?

I wanted to know what clas of amplifer the TDA7266 from STmicroelectronic is, but I couldn't understand. Its datasheet says: The TDA7266 is a dual bridge amplifier specially designed for TV and ...
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0 votes
1 answer
73 views

Audio: Can I use a stereo-amplifier with a mono DAC?

Here a schematics of my project: There is only one speaker (the sound is mono) The DAC I will use is a mono DAC, its reference is ES8311 and its datasheet is here: URL. It has two ouputs: OUTP and ...
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-1 votes
3 answers
86 views

A way to make simple digital potentiometer [closed]

I am making a project which has an audio application with a TDA amplifier. To change the volume I have a potentiometer on the input of the amplifier so when you change its value the sound is higher or ...
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2 votes
2 answers
229 views

Line level to microphone level to record

I have a digital piano with an earphone output where I can connect a simple earphone (like in the picture below.) It works fine. I would like to connect this earphone output to my smartphone jack (...
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0 votes
3 answers
89 views

Voltage divider from speaker to line level generates noise/huming

I have a really old device and I can only access the speaker wires of it. I want to setup a line level from the speaker so I can connect it to another device. I used a very simple voltage divider (2 ...
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0 votes
1 answer
113 views

Unexpected Amplifier Warm Up

The following diagram shows the signal processing stage of an audio system that I've recently implemented on a perfboard. The images of the circuit board are given below: The circuit starts with a ...
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2 votes
2 answers
331 views

Audio splitter without buffer possible?

The audio source is an active mixer with an output impedance of 100 ohm, 25 mA output current and 3 V-pp max. The inputs that would receive this source are (1) an ADC with an input impedance of 20 ...
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0 votes
0 answers
84 views

Buffered audio splitter too hot for volume chip

I'm building MIDI controlled effects pedal that autofades the blend amount of a send-return effect loop. Still pretty much a noob on the analog side, so bear with me. Firstly I need to split the ...
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0 votes
1 answer
73 views

Does the sine wave function of a UPS matter even when there is power from the grid?

Does the sine wave function of a UPS matter even when there is power from the grid? I'm considering getting a UPS for my home studio computer (recent Mac Mini), router, sound card, speakers, and ...
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  • 103
2 votes
1 answer
60 views

Second order low pass filter: two 1st order filters not-immediately cascaded

A second order low pass filter (LPF) can be made by cascading two active LPF (an RC network + opamp.) What happens if, instead of immediately cascaded, an active LPF acts at the input (buffer) of a ...
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  • 61
0 votes
2 answers
101 views

How does one convert DC to AC in context of playing audio?

I'm working on a little gadget. A simple two button mini game with a simple oled i2c display. I wanted to add sound and a bit of music. Nothing too fancy, mainly drums using white noise and two or ...
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0 votes
2 answers
103 views

Variable Forward Voltage Diode

I'm attempting to create a guitar pedal using diodes to clip the audio signal and create distortion. Specifically, I'm trying to create a circuit with variable clipping by using a circuit that acts ...
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  • 23
1 vote
2 answers
54 views

LTspice-RIAA-simulation not working out

I'm trying to simulate a RIAA-phonograph-preamp since I want to build a phono-preamp. I've built everything according to the data provided by LT for the LT1115. But my simulation seems to not be ...
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1 vote
1 answer
80 views

How do I compute the power consumption of an audio amplifier?

I intend to use this audio amplifier in my project : PAM8019 It has two analog inputs : left channel and right channel. It has two analog ouputs, which are the amplified inputs. Let's say I follow the ...
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0 votes
1 answer
41 views

How to disable Bluetooth temporarily for line in to work in mini hifi amplifier TDA7492P? [closed]

The TDA7492P, a mini hifi amplifier with Bluetooth and line in does not allow line in, it jumps to Bluetooth soon after the start and blocks the line in signal. It goes like this: Power on line in. ...
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1 vote
1 answer
66 views

Switching stereo input between three stereo outputs

I have a circuit I'm designing which will switch a stereo audio input signal between a total of three possible outputs: 1 - Dry (i.e. the signal will go straight through without being effected), 2 - ...
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  • 19
0 votes
1 answer
54 views

Symmetric audio signal output on single voltage circuit

How to implement a symmetric audio output on a small audio device using a single supply battery voltage only. I like to drive symmetric XLR inputs, and use a symmetric connection for noise suppression ...
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  • 531
4 votes
1 answer
105 views

How to properly couple DC in this biased headphone amplifier design on power-up?

I am a self-study noob to electronics (and audio electronics) but diligently learning every day :) Some things I understand well, others I'm fuzzy on. This device is a headphone amplifier using NE5532 ...
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  • 141
2 votes
2 answers
131 views

Power supply noise reduction

I am new to electrical Engineering and would like to know wich noise reduction filter ist better for use in audio equipment. Some decalcifications: VBUS --> 5V from usb-port GND --> Ground from ...
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1 vote
2 answers
50 views

Cheap Audio Equalizer board converted to seperate outputs

You can get a cheap ten band equalizer board for about $10. I was inspired by circuit bending and modifying pre-made circuit boards. So I wondered if an equalizer such as this could output each of its ...
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1 vote
1 answer
63 views

STM32F746 I2S clock fails

I have discovery board STM32f746NG In first try I've set this: Activate I2S2 with piout: PB4->WS - PI3->SD - PI1->CK. Instantly after activating I2S periferal with command ...
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1 vote
0 answers
113 views

ESP32 High Sample Rate I2S

Recently, I've been working on a project that involves receiving a high sample rate I2S signal and writing it to an SD card with an ESP32. At the moment, however, I believe I'm struggling to even ...
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0 votes
0 answers
71 views

Capturing High Speed I2S To SD Card

I've been working on a project that involves receiving two high speed I2S lines and writing the data off of them to an SD card. The interface has the word select and bit clock I2S lines shared between ...
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1 vote
2 answers
86 views

How does adding a tweeter electrically affects the main driver?

I recently added a pair of tweeters to my car's front pair and what "baffles" me is that after adding them, I hear more bass besides the added highs, so my question is whether adding these ...
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