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

1
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1answer
48 views

Simple audio equalizer design: One filter is sending all the other signals to ground

I’m designing and building an audio equalizer with active frequency filters for my school project and I thought the base design was completely functional until I decided to simulate it on Proteus VSM. ...
6
votes
2answers
1k views

How to avoid a electrolytic capacitor on a (audio) signal path?

I've built a compressor basing on the all-in-one chip THAT4301. It works well. But I'm still not happy because of the electrolytic capacitor I used in the signal path. My design was based on the ...
-2
votes
0answers
47 views

A simple tube amp schematic for begginers [on hold]

I have recently got ahold of some vaccum tubes from an old TV and I would like to put them to good use in a headphone (32Ω) tube amp, I can use PCC88, ECF82, ECF807, ECH84, EF80 (Sorry for the ...
-1
votes
0answers
27 views

Three Speaker RCA Breakout Cable

I have an RCA breakout cable that is male 3.5mm to two RCA connectors for the two channels. I want to splice in a cable, or make a Y cable, that will allow me to hook in a center speaker but I suspect ...
0
votes
2answers
90 views

importance of voltage Gain of an audio Op amp

I have been looking into audio amplifiers theory. So I understand that in the output you need a current gain in able to drive low impedance loads. But I am having difficulty in understanding why it ...
2
votes
1answer
81 views

Audio Transformer output straight into an opamp?

Below is a circuit I'm working on. It's a guitar input buffer featuring transformer isolation. The transformer I'm using is pretty expensive and should be fairly linear, but I decided to add a graphic ...
4
votes
3answers
131 views

Class D power supply filtering for conducted emissions

I have recently designed an audio player that uses the TI TPA3112D1 power amplifier, and mostly based it on the reference design and schematic. I find however, that the design is failing the ...
0
votes
1answer
34 views

USB 2.0 full speed audio class max sampling frequency?

what is the maximum achivable sampling frequency when using USB 2.0 full speed isochronous audio transfer and stereo 24bit format (recording only) ? when no compression is used !
0
votes
3answers
87 views

The circuit-level “why” of the loudspeaker / amplifier “POPP” sound

in the other question about the "popp" sound I asked if the "popp" is harmful to a loudspeaker. Since I am also interested in the "why" on the circuit level, here is my next question. I put this ...
0
votes
1answer
60 views

Loudspeaker / Amplifier “POPP” sound [on hold]

I have different sound systems here. Some of them share the "problem" that they make a "popp" sound when I switch them on or off using the front-panel switch. If I accidentally switch off the socket ...
0
votes
1answer
44 views

Should I add a resistor to the RCA Outputs of my device?

Very simple question I just can't find any information about that is not someones opinion or "what their ears think sounds best" When getting the Line output from my final Opamps to the RCA Jack, ...
1
vote
1answer
30 views

Audio volume levelling / AGC for spectrum analyser

I'm busy building a preamp, and want to include an LED-matrix spectrum analyser on the front panel (for aesthetics, not accuracy!) I've set up a circuit that uses a couple of MSGEQ7 chips to analyse ...
-1
votes
0answers
26 views

Speaker for Pi Zero W [closed]

I'm looking for speaker without battery. I mean I need a speaker whose power can be supplied by raspberry pi zero w. I think I can use USB 2.0 simple speaker. I can cut its usb cable and connect its ...
0
votes
2answers
53 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
94 views

Emulating an SD-Card with a microcontroller (or Raspberry Pi)

some background to my story to begin with: I went to a store and asked for a bluetooth fm transmitter for my car and the guy sold me something that only plays from an SD card and I didn't even bother ...
0
votes
0answers
26 views

Can a surge in voltage or current from a DAC cause a permanent rise in internal resistance of an In Ear Monitor headphone? [closed]

I have a pair of Westone W60 In-Ear Monitors. I had them plugged into my USB DragonFly Red DAC and a fall caused the DragonFly Red to bend at the USB plug portion while they were plugged into my ...
0
votes
1answer
118 views

Sine wave noise on the 8-ohm speaker

I'm trying to transmit and receive voice to my GSM modem over a 10-meter cable from a handset connected board using TEA1062 line drivers. But when I connect a speaker to the handset, a sine wave noise ...
0
votes
1answer
28 views

Input capacitor on audio MAX49XX

I'm trying to design an audio mux based on a MAX49XX There is input capacitor on audio lines but not any tip to find the value and technology. I suppose that's a high pass filter to block DC signal ...
0
votes
2answers
54 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 ...
4
votes
1answer
246 views

YM2612 Circuit Audio Signal Offset Voltage

I've been working on a project messing around with the YM2612 soundchip and hooking it up to a microcontroller. I'm able to drive the chip, but I'm having a little trouble with the audio part of the ...
0
votes
1answer
109 views

Analog to Digital conversion for an old analog synth

I'm trying to convert an old analog synth into a digital one. I'd like to bypass the speaker and read the values of the speaker with my arduino. But I don't know how to do it
0
votes
1answer
39 views

Onkyo subwoofer amp, disable automatic power toggling

I have this subwoofer that turns on and off based on if there is signal on the input. It's real annoying that I will be watching something quiet, it will turn off, and then later it will turn on again ...
0
votes
2answers
60 views

In an audio circuit, with an LM386 chip - how does the DC electric power and the AC audio work?

I am currently putting together a simple audio amplifier using an LM386 chip. In the midst of studying how this chip works, and the proper circuit analysis behind it, I began thinking about how ...
1
vote
1answer
70 views

How to connect one pin to ground when an another analog pin is triggered

I'm trying to combine two working electronics projects into one. I have a standalone piezo sensor that I can read values from when it vibrates via an arduino, and I have a standalone audio board (no ...
0
votes
1answer
32 views

Teensy audio alternative [closed]

Can anyone recommend some alternatives to the teensy with capabilities to play multiple audio files. I have a electronics project with a interactive game it is currently using a couple of button ...
0
votes
1answer
60 views

What all do I need for a simple speaker circuit?

I'm trying to use a 555 timer in astable mode to play a square wave sound out of a small speaker, but I'm having trouble understanding all the components I should use. I think I need something like ...
1
vote
1answer
35 views

Connecting an arduino to desktop speakers

I would like to get audio output through a pair of small desktop speakers (standard computer speakers - Logitech or similar). Is it safe to directly connect the ground bit of the 3.5 mm jack to the ...
0
votes
1answer
48 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
0answers
59 views

Why could cause abnormal peaks at the start and end of a sound produced by a speaker?

Ok so I was recording sound of different frequencies produced by a speaker and abnormal peaks appeared on the amplitude of the waveform of some of the sounds when I opened the sound recording in ...
-1
votes
1answer
69 views

Canceling ambient sound [closed]

I've just moved into a new flat and I noticed that there is a lot of car noise coming through windows. I know, I could just close the windows, but that's a less interesting approach to a problem. So ...
1
vote
2answers
84 views

RF Attenuator Failure

I am attenuating an audio frequency (50 KHz) signal that is pulsed at 666 W for 300us with a period of 300ms. I estimated the power dissipated averaged over a period to be approximately: \$\frac{300 \...
1
vote
4answers
57 views

Analog Audio Signal over dedicated Ethernet/Twisted Pair Cable

I need to send an audio signal over 3 meters and back again on the same line (the plan is to put an on/off switch and a volume regulator at the end of the line). Additionally I would like to send 12 ...
0
votes
1answer
34 views

pcm512x charge capacitor value

First of all I'd like to say that I'm quite new in electronics (I'm a software developer) so I might be missing some basic knowledge for which I apologize. I'm trying to create a DAC using the ...
1
vote
2answers
144 views

Unbalanced to balanced audio signal conversion

When I was looking for some information how to convert unbalanced audio signal to balanced, it was hard to find info other than "use transformer" or "buy X device to do this". Then I found this ...
1
vote
2answers
64 views

Unbalanced to balanced variable impedance matching

I want to design an impedance matching transformer to convert an audio line from unbalanced ( stereo phono jack type) to a balanced type ( XLR jack with 600 ohms). What can be the easiest way around ? ...
0
votes
1answer
89 views

Why I2S is better for transmitting audio compare to SPI

I am trying to understand why we use I2S is better for transferring audio than SPI as I2S has less bandwidth compare to SPI.
0
votes
1answer
178 views

Difference between increasing microphone sensitivity and amplifying output signal in software

I am a bit of a newbie to the audio world, so please bear with me. What would be the difference between getting a high sensitivity microphone and using a low/medium sensitivity microphone and using ...
-1
votes
2answers
110 views

How does an electrical speaker determine amplitude and frequency? [closed]

So, I know that a DAC converts coded binary signals into analog signals, but what sort of thing determines the pitch and amplitude of the outgoing sound? Does the DAC use a clock for frequency and ...
1
vote
1answer
82 views

Precision Rectifier Circuit to detect peaks

I have a question about speed at detecting peaks. Essentially, my question is that I have a precision rectifier with a capacitor equipped to the end of it to smooth the incoming full bridge ...
0
votes
3answers
97 views

Volt/Amp dependent RLC band pass -> Loudspeaker expander using lightbulbs

I want to create a input energy dependent frequency shunt network, which goes in parallel with a loudspeaker, At low volumes, a certain midrange frequency should be shunted off the loudspeaker. The ...
0
votes
3answers
80 views

I2S TDM channels maximum bandwidth

Does I2S support sending multiple mic (around 20) channel data? If no, what is the limiting factor in supporting multiple mics? Also, is there any way to send multiple channel data from different ...
1
vote
1answer
76 views

Odd distortion in op-amp circuit for audio amplification

I'm new to electronics, so I apologize if this is simple. I'm trying to create a simple amplifier mainly for a guitar input, but testing it with an output and input from my sound interface. The ...
2
votes
1answer
109 views

Is a MOSFET's body diode different than an ordinary silicon diode at audio frequencies?

So a friend of mine asked me to evaluate how hard would be to build a guitar effect like the ones described in this thread. The pedal in question is a customization of the Ibanez Tube Screamer. The ...
2
votes
1answer
77 views

How to increase sensitivity of audio-frequency pickup coil

I am building an instrument intended to pick up weak (~100 picotesla) 25 kHz oscillating magnetic fields with Faraday induction. As shown in the photo, I have a 4-layer solenoid coil for pickup ...
-2
votes
1answer
65 views

Switch a line level audio signal - which chip is best WRT noise, low loss? [closed]

I am relatively unexperienced with audio circuits, and need to switch a standard line level signal, AC, about 6Vpp. I have the chips listed below, and would very much appreciate some pointers as to ...
9
votes
2answers
1k views

Low pass filter with two capacitors?

I'm trying to drive a speaker from an ESP8266 for a project, and found an article suggesting (ab)using I2S as a 1-bit Pulse Density Modulation DAC. Apparently that's pretty noisy, so the article gives ...
-1
votes
1answer
98 views

Why is audio jack coaxial (round) [closed]

Why is audio jack in coaxial (round) shape? I remember there were earphone plugs in the shape of miniusb (not exactly, but close to that) on some old phones and the audio worked just fine. Wouldn't ...
2
votes
2answers
85 views

Digital Audio Effects Design [closed]

I've recently graduated university with an MEng degree in Electrical and Electronic Engineering. As a third year project, I've used an ST-Microelectronics ARM Cortex-M4 based Nucleo microcontroller ...
0
votes
1answer
41 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
0answers
29 views

Multiplexer Configuration for Switching Audio Effects Loops

I'm in the middle of designing a guitar pedal that digitally controls the routing of audio between different effects loops using switches. I am having a hard time figuring out what hardware//...