Questions tagged [audio]

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

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-1 votes
3 answers
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A way to make simple digital potentiometer

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
200 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
82 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
110 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
323 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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  • 61
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0 answers
83 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
65 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
51 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
99 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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-2 votes
0 answers
42 views

Combining audio signals without backfeeding the original signal

I'm building Audio tracks looper on Raspberry Pi, which records audio signal from Keyboard / Guitar (Jack plug) and plays it along with the original input on headphones. but this scheme is faulty, I ...
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0 votes
2 answers
88 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
48 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
73 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
33 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
64 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
46 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
95 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
110 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
46 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
0 answers
47 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
49 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
54 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
76 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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  • 163
1 vote
0 answers
31 views

Cheap Bluetooth receiver noise reduction

I bought this cheap audio receiver on a whim and found it was quite noisy on the audio channel. I know it's a piece of junk, but I thought it would be an interesting exercise to learn what was wrong ...
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  • 49
0 votes
0 answers
38 views

Audio noise on output of PCM1789

I am developing a Bluetooth adapter to be able to listen to music from my phone in my car. I am doing that with ESP32, from which the audio data is sent to PCM1789 which converts it to the analog ...
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0 votes
1 answer
59 views

Transistor for Signal Attenuation

I've been considering a circuit that could be used as an equalizer for an audio signal. Specifically, I'm planning on using a set of filters (a cross-over) to split the input into respective channels,...
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9 votes
7 answers
3k views

Why do speakers use clamp connectors?

Why do many audio speakers use clamp terminals to connect speakers one to another, rather than jack connectors?
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0 votes
1 answer
35 views

How should I go about overriding or switching between an internal control voltage source when an external source gets connected?

For example, I'm using a potentiometer to modulate an internally generated +5v audio signal, and I'm sending the output signal down to the next part of my circuit. If I were to add an external input ...
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4 votes
1 answer
120 views

If I invert an I2S data line, it inverts the audio, right?

It seemed obvious to me, but then I read all these audio forums where they're talking about overflow, tones, etc. and I just want to make sure I'm not missing something. If you take an I2S signal: ...
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  • 27.8k
0 votes
2 answers
61 views

Simple data over sound solution

I'm designing an access control and I'm evaluating different technologies to make the device unlock the access. One of the technologies I'm studying is integrating a microphpone in the device and ...
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-1 votes
2 answers
38 views

What is the recommended Amplifier/Receiver (AVR) for my Surround Sound 5.1 Speakers Configuration?

Here are my speakers & subwoofer configurations, wondering if anyone can help me suggest a minimum AVR configuration I should go with: I am looking at Harman/Kardon or Denon AVRs. Little back ...
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0 votes
0 answers
37 views

voltage amplifier design feed by current source

I want to connect electret microphone with long wire to receiver. Usual way is to use balance line technology, but it can be expensive, then I've opted to use CCLD Constant Current Line Drive ...
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0 votes
0 answers
35 views

How to control multiple current paths from one physical switch?

I am working on a college project for my Analog Electronics class as part of my music technology class. I want to create a synthesizer where buttons can control Rf to change the oscillators frequency, ...
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0 votes
1 answer
50 views

Large signal current measurements of a loudspeaker

I'm trying to work out a method of measuring electrical current through a loudspeaker load for voltages in excess of +-20 V to be read by an audio interface - I need to scale down both voltage and ...
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  • 1
1 vote
0 answers
60 views

Capturing High Sample Rate I2S via USB

Recently, I started working on a project to convert my Sony XDR-F1HD radio to a device that I can connect to over ideally USB to record the RF signal off of the air. All demodulation and processing is ...
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3 votes
1 answer
678 views

Headphone output - what is the function of these resistors going to ground between the decoupling capacitors and headphones

The Korg Monotron Duo synth uses the TPA6111A2 headphone amp. The circuit they use is largely the same as the one from the datasheet - except for R78, the 470ohm resistor going to ground right after ...
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0 votes
3 answers
121 views

What effect does a splitting an audio signal using a y-cable have on that audio signal?

Given a clean instrument-level audio signal of reasonable amplitude passing from point A to point B via a TR/unbalanced cable, what effect would replacing that cable with a TR to dual TR cable running ...
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0 votes
2 answers
54 views

Active 2nd order elliptic filter design reference

Can anyone share a design reference for an active differential 2nd order elliptic filter? This is for audio applications. I need an elliptic response with 0.5 dB pass band ripple and -40dB/decade ...
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0 votes
1 answer
71 views

My speaker connected to my TV is making weird noises only when playing videos [closed]

Apologies if this is the incorrect forum, if anyone knows of a better forum to ask on I would appreciate the redirection. I have a very specific issue regarding audio playback from my TV. I have a ...
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0 votes
1 answer
55 views

Does phantom powered audio system's ADC also works on 48v

Phantom powered microphones with their preamplifier can generate signal from -48 to +48 volt (or 24 or 12), then it run through wire and maybe receiver and reaches ADC. I want to know if 48v signal is ...
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0 votes
1 answer
37 views

Component in series with digital communication lines

What is the component highlighted in picture? Main IC in the picture is PCM510xA.
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2 votes
6 answers
249 views

Why is my amplifier motorboating?

I have been trying to make a simple guitar amplifier and I've been having a lot of trouble trying to get it to work properly. It keeps on motorboating at a very low frequency which is driving me nuts. ...
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0 votes
1 answer
63 views

Why might my rack chassis have ground leakage?

I have a metal rack that contains a single item: A Samson S Patch Plus Patchbay. The patchbay is well isolated from the rack using nylon shoulder insulating washers, and I've thoroughly tested this ...
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0 votes
3 answers
108 views

How to achieve an input impedance of 600 ohm for a balanced audio signal?

How to achieve an input impedance of 600ohm for a balanced audio signal with 25Vpk input and with 13.15dB attenuation?
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-1 votes
1 answer
31 views

Light to Sound Device [closed]

I need a device I can put on a light externally to make a sound or alarm when it turns on. What device would this be? Or how would this be done simply without soldering?
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-3 votes
2 answers
121 views

Designing a 500 mW audio amplifier

I have to design an audio amplifier to drive 500 mW 8 ohm load. I used two SMD transistors (BCP54 NPN and BCP51 PNP) and three BC847Bs, one to drive the BCP transistors, one for voltage gain, and one ...
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0 votes
1 answer
92 views

Connecting resistors to the wires directly decreases the audio output

I am trying to replace a 2 channel speaker with another 1 channel speaker. To do so, I connected every wire (+ & -) to a resistor, then connected both -ves and +ves together (I read how to do it ...
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  • 3
0 votes
1 answer
47 views

Reduce audio signal from TV when volume exceeds a certain level

I hate how loud action scenes are in movies, compared to how low the talking parts are. My TV is currently connecting to some speakers with a jackstick. Is it possible to measure the volume with ...
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  • 309
0 votes
1 answer
88 views

Envelope detector for audio compressor

I found the envelope detection part of an analog audio dynamic range compression circuit here, and I'm trying to figure out the purpose of: The second series diode The 100k feedback path from the 2nd ...
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  • 1,109
1 vote
0 answers
102 views

PCB Design Review (KiCAD)

I'm still a beginner at PCB design so I wanted to get any feedback on my PCB. The project I'm working on is for a DIY Pocket Operator, there are some pushbuttons/LED's, a Teensy 3.2/Audio shield, a ...
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