Questions tagged [audio]

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

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125 views

Automatic Audio Source Switching

I was unable to find an answer to this question, but feel free to link any additional threads I may have missed. In my car, I have an aftermarket amp, and multiple HAM and public service radios. I ...
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1answer
101 views

Can replacing a capacitor with a different brand cause audio channel imbalance?

I recently broke a "Nichicon 100µF 10v Fine Gold High-Grade Audio Capacitor" off my motherboard's audio circuity and replaced it with a generic 100µF 50v capacitor I found at a local ...
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83 views

Can I use a bench power supply as a substitute for a 9V DC adapter?

I want to test a guitar pedal but I don’t have a 9V adapter around - but I do have access to a DC power supply. Is it possible* to alligator clip the +ve to the power terminal and ground to the ...
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3answers
628 views

What is this kind of audio cable called?

I broke my headphone cable. It is exactly like the one in the image but I don't know how to search for this kind of audio cable (I only find cables with at least one receiving end). Does anyone know ...
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1answer
249 views

Powering an ESP32-DevKit with 3 AA batteries

for my project i have to put quite some stress on my ESP32-devkit in addition to it needing to be a mobile device. I need to power the esp32, an SD-card reader, an LCD-display, two I2S-MEMS-mics and ...
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3answers
63 views

Analog linear interpolation of AC signals

I have two AC signals in audio range \$V_1\$ and \$V_2\$, both around \$2\,\mathrm{V}\$ p.p.. I need to interpolate between the two linearly through some external control voltage \$V_c\$ (ideally also ...
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1answer
51 views

Problem with ADC in AVR XMEGA

I am using an Xmega32A4U I convert an audio with ADC and after processing it sends out with DAC. I checked Power supply and try all of parameter to use ADC but it is a big problem and the audio out ...
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1answer
156 views

Capacitive voltage divider frequency response and cut-off frequency

I'm working on designing a guitar pedal based on the topology of an old tube amplifier I own. Between the amplification stages I found an inter-stage filter that I cannot understand in the frequency ...
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1answer
139 views

3.5 mm Electret Microphone wiring

I have what I believe to be an electret microphone on a 3.5mm jack. This kind: I also have a socket that provides access to the three lines: Finally, I have several microcontrollers and a heap of ...
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1answer
65 views

Audio amplifier bridge tied load (BTL) output as analog signal to MCU

I am trying to find a way to amplify the signal from an electret microphone & feed it as an analog signal to a microprocessor to drive LEDs based on sound. If I look at the amplifier ICs they all ...
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1answer
51 views

What's the component name/part number of a motherboard audio jack?

I've de-soldered a triple 3.5mm audio connector thing from a dead motherboard and would like to use it for a small project. However, I have no idea what it's called, there's no part number on it, and ...
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3answers
179 views

How to reduce the beep noise coming out of an MP3 module for my TDA2030 amplifier circuit project?

After making a stereo circuit board with a TDA2030 and mobile aux as input, I wanted to connect an MP3/BT module to my own indigenous audio amplifier circuit which would make every action easier I ...
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4answers
214 views

Help with a multistage NPN BJT audio amplifier

I am a beginner in electronics. I have recently learned about BJT amplifiers. I have designed this simple BJT amplifier on my own. The book I am following only has theories about various topics but I ...
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48 views

Understanding photodiode modes and practical effect on noise vs response time tradeoffs for audio applications

I am an experimental musician with admittedly very little electronics experience (but I do have a mathematics degree) trying to find a decent photodiode for a project where I send audio signals via ...
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74 views

Transmitting I2S over 6ft

I've been looking at audio ADCs with most rated at 192Ksps with 24 bit audio. Typically the output is in I2S, but I understand that the signal is not intended to go far. I understand that HDMI can ...
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3answers
138 views

Final transistor in VOX circuit design is saturated even when no audio is supplied

Background: I have a μBITx v6 HF transceiver. It has an audio input and output, and a mechanism where the transmitter is keyed up when the ring connector (called PTT, push-to-talk) from the audio ...
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83 views

Quiet sound from ESP32 via decoder DAC I2S MAX98357A

I am building a project to play sound in MP3 format via the internet. In the project I am using an ESP32 NodeMcu and a MAX98357A. Sound is good quality but is too quiet. The MAX983557A is working in ...
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170 views

Add 5V bias power to use an electret microphone with XLR audio interface

I recently acquired an audio interface (Behringer UMC22) and, since it's quite a bit better than my motherboard, I'd like to connect my modmic 4 to the XLR mic input. The interface has phantom power ...
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82 views

CB Radio Effects Unit. Can anyone help with a wiring puzzle?

I’m working on a small CB radio project for a friend, but am having a hard time figuring out some technical details. If anyone has any ideas on how to solve this puzzle I’d be super grateful. The ...
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1answer
33 views

Does it matter if the shunt resister in an audio Line Out L-Pad attenuator is 6 feet away from the series resister?

I am designing a 14dB L-Pad attenuator to be buried in a guitar instrument cable as per below. The placement of the 22K ohm series resister is to go inline inside the amplifier side of the 1/4" ...
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1answer
118 views

Resistor circuit to correct impedance matching and attenuate signal by 10 decibels

I've got a Line Out on my amplifier with 100-600 ohm impedance (avg. 350). I have it connected to an effects pedal that has a 1M ohm input. Right now the signal is clipping from the amplifier and I ...
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28 views

Noise in Voltage Buffer

I am trying to build a voltage buffer for a piezoelectric record player cartridge. The amp built into the record player doesn't provide the necessary impedance. I have tried multiple circuits ...
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0answers
28 views

Separate amplified speakers for landline phone

I want to connect the landline phone handset speaker to some amplified speakers. the idea is to splice the speaker output to a switch, then switch between the handset and the amplified speakers via a ...
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4answers
302 views

Snap in capacitor in place of through hole

I have an old Technics SU-V5 amplifier from 1980. It has through hole capacitors with very thin legs. All new capacitors are snap in and their legs are very thick. They won't fit in the PCB. How ...
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2answers
192 views

Electret condenser: what is the point of this circuit and how to wire it to a TRS jack

Let's look at the datasheet of a typical electret condenser: https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf What exactly do the resistor and capacitor do and how does one determine ...
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36 views

Signal routing to power amp LM1876 based on TS5A22362 SPDT

Has anyone ever used the TI's TS5A22362 CI to route audio? I though of implementing the circuit below on which I intend to use the same supply voltage to switch between normally closed and normally ...
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2answers
57 views

Eliminating humming from switched audio jack

I'm using a simple DPDT 3.5 audio jack to attempt to switch between two audio outputs - speakers with a built in amplifier and headphones. The speakers work just fine, but when the headphones are ...
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1answer
94 views

ICs on opposite sides of a PCB

I am relatively new to PCB design and circuits in general. I am routing my first 4 layer board now and I am wondering about placing ICs on top of each other on opposite sides of the PCB. The ICs in ...
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2answers
112 views

How to blend two guitar audio signals?

TL;DR: Can I use a blend potentiometer to blend two audio signals? I have an Ibanez GSR 200 bass guitar. It has a potentiometer to control the volume of the neck pickup and another potentiometer to ...
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1answer
49 views

WT2003S mp3 greeting card

I'm busy helping a friend with a project involving a cheap mp3 playback circuit based on the WT2003. The original design is based on an LDR which shorts an amplifier circuit and initiates playback, ...
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0answers
55 views

How to combine a stereo audio signal, but maintain the original stereo separation?

A long time ago I had a CD player boombox and wanted to add a "subwoofer" to it (it was really just a small guitar amp with the EQ set to cut the highs and mids). The CD player had a 3.5mm ...
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2answers
143 views

Watts P.M.P.O. and audio equipment power

I am a beginner in electrical engineering, and to begin learning I decided to look into audio amplifiers. I have seen that the power of audio amplifiers is often described in the units of watts, watts ...
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4answers
92 views

How to calculate the expected output current being drawn by a speaker?

I'm trying to calculate the current that will be drawn by a 4ohm 3W speaker from a MAX98357a IC amplifier. From my understanding, the amplifier takes in a I2S audio signal (which originates from an ...
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1answer
54 views

Treble bleed frequency cutoff

I built an attenuator for my guitar amplifier. I took the circuit from here but left out the 4 ohm toggle since my amplifiers all have 8 ohm outputs. Below is a simplified schematic of the circuit (...
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1answer
70 views

Ideas sought for RF impedance selection

Context I'm designing an audio amplifier input stage. This amplifier is fully differential. Among other things, one of the design goals is to have good CMRR for UNbalanced (single ended) inputs with ...
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0answers
80 views

How can I get rid of noise from leds on an audio line

I am working on a project which involves 8 sets of LEDs being controlled by a micro-controller. The micro-controller is also communicating with an IC which is sampling an audio signal. The audio ...
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3answers
206 views

Why silver plating for 3.5 mm stereo jack

Never thought about it until previous part I used, 3.5 mm stereo jack, gold plated, has depleted in the place I was buying it from. Research for replacement shows that such connectors may have gold or ...
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2answers
139 views

Is 3.5mm audio jack suitable for rotating connection?

I am designing a product where a removable accessory part should be connected while allowing rotation - boom microphone connected to a headset - you can plug and unplug and it should be possible to ...
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0answers
58 views

PSU using -15V and +15V in order to get 30V? [duplicate]

I've been a couple of days looking for an answer, but without much success. I was wondering if I can connect a 30V audio device to the +15V and -15V of a PSU (+15V / GND / -15V)? Or is it preferred to ...
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1answer
78 views

What's the difference between using 3.7v and 9v as phantom for electret mic?

I'd like to pass from a mic/filter/amp circuit with the LM386 and powered by a 9v battery in single supply to a 3.7v equivalent using the PAM8403. In hi-fi audio the phantom DC is 48v. Is there any ...
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2answers
149 views

How to control the gain of more than one TDA2030/2050 IC with a single potentiometer?

I am on a project of making a music system which will be able to output 6 speakers. I want to control the gain of each six TDA2030/50 ICs with a single potentiometer. Here is a schematic example of 2 ...
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0answers
169 views

Using TRRS audio jack as a TRS

I'm trying to design an audio input card that only need to support TRS format. I was hoping to use TRS + 1 switch (to indicate if a plug is inserted) but because of mechanical constraints all I could ...
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1answer
49 views

What should be input and output for CA3020A power amp circuit and how to implement it?

I am trying to rig up Figure 1b and Figure 8 circuit from datasheet to test the power amplifier CA3020A. Not able to understand the datasheet my doubts are figure 1b what are values of vcc1, vcc2 ,...
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1answer
312 views

Will this op-amp circuit work to convert differential audio into single-ended input for the bluetooth transmitter module?

I'm making a bluetooth audio transmitter based on FSC-BT802 module that needs to take an amplified Mono 3W 5V (from -10V to +10V) differential audio as Line-In input. So I need a differential to ...
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4answers
109 views

Is connecting a generator to the line input of an audio amplifier OK?

Disclaimer: I'm computer scientist I have a sinus wave generator (handyscope H3-5) from TiePie but the output power is insufficient for my application. The specification is here. I need at least 60W. ...
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1answer
205 views

Can you cover tubes?

All of the tube amp designs i see have the tubes exposed to air. Is this a design feature for heat dissipation or is it simply because some find it pretty?
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75 views

Custom Bluetooth 5.0 audio transmitter analog LINE IN input attenuator from a 3W speaker amplifier

I'm not a professional electronics engineer so I'm looking for some help in solving this problem: I'm developing my own custom Bluetooth 5.0 audio transmitter module using a FSC-BT802 module from ...
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3answers
86 views

Subcircuit identification - Power amp

Could you please tell me what is the purpose of this highlighted part of the circuit? This is from a Soundtech 6150 powered audio mixer. This specific mixer is outputting the supply voltage and has ...
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2answers
368 views

3.5mm audio jack to trigger 5V relay

I am pretty new to electrical engineering, so please bear with me. I am trying to activate a 5V relay when it detects sound coming through a 3.5mm jack. Can anyone help me figure out how to do this?
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2answers
43 views

Arbitrary switching of a large number of analog signals

I'm thinking about building a programmable patch bay for analog audio signals. There would be 24 analog inputs x 24 analog outputs with switching of any input to any output. Only one signal at a time ...

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