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

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0
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1answer
26 views

How is this figure supposed to be interpreted in the datasheet for the LM4766 audio amplifier, and determining the needed power requirements?

First off, I really have no experience when it comes to audio electronics, so forgive me if these are naive questions. In any case, let me explain what I'm doing/trying to do. I have two speakers ...
0
votes
1answer
32 views

Using an unconnected audio splitter degrades audio signal quality?

Consider that you have one of the following: These are used to connect 2 male audio connectors into only one female connection. Since I can't find, for now, where I have the audio cable extension, ...
1
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0answers
21 views

Analog Microphone Preamplifier

In my design I want to use a quad Operation Amplifier for amplifying the output of an Analog MEMS Microphone before connecting to the CODEC IC. I would also be using the MIC preamplifier circuit for ...
1
vote
1answer
47 views

Why does my AY-3-8910 sound so distorted?

I'm building a circuit driven by an Arduino UNO that controls a AY-3-8910 programmable sound generator. The AY has three pins ...
-4
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0answers
17 views

USB powered HDMI to dual output analog signal for VIDEO? [closed]

I've been searching for hours now, to find this specific adapter but with no result, I came here to ask. Is there any commercial off the shelf product that can intake HDMI video input and outputs ...
0
votes
1answer
49 views

How can I make the power amplifier stage for this audio amplifier?

How can I implement a Power Amplifier stage for powering an 8 ohm load? I tried making an AB amplifier, but either it doesn't work or I'm just not able to make one. The output of the third op-amp is a ...
0
votes
0answers
40 views

amplifier for 3W speaker [closed]

I am developing a portable speaker with a 4ohm 3W speaker. I am new to audio amplifiers hence not sure which one to use. I have read some posts mentioneing the use of LM386 audio amplifier but its ...
1
vote
1answer
43 views

Use of RC circuit in amplifier output stage

I have to use a LM384 amp circuit (shown below) for a school project and need to explain how it works. I've read the datasheet (http://www.ti.com/lit/ds/symlink/lm384.pdf) and thus have a guess about ...
1
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3answers
76 views

Measure human voice for ambient noise level

I need to develop an ambient noise level to measure the loduness in an office. Sometimes during the day people raise their voice more than they should and a lot of confusion is created. So this device ...
2
votes
2answers
69 views

Best way to sync LED's to light NES figures on a wall clock?

Advice & Ideas needed... Working on a project - a custom wall clock with perler bead NES sprites in the place of the numbers. The figures are mounted to a wood board with cutouts underneath, and ...
0
votes
3answers
44 views

jfet preamp output attenuated and clipped on bottom rail when connected to codec

I am currently working on an embedded audio processing system for electric guitar. I have constructed two JFET preamps (left and right channels) based on the j201 transistor using the common source ...
0
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0answers
24 views

Sending data from web app to arduino powered virtual doorman [closed]

I do not know much about electronics but am looking to learn more. I have a small project I have completed a good portion of that I now need some electronic expertise to determine if what I am trying ...
0
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0answers
31 views

USB streaming controller

I am developing an Audio codec using the TIs AIC3254 chip. For the interface, they have suggested a USB streaming controller which they no longer support and other alternatives are a full blown Audio ...
0
votes
1answer
89 views

Adding Bass and Treble control to existing schematic

I have a little project in mind that I want to try. This picture below is a stereo amplifier circuit. For more info about it, you can see this page. Stereo Amp The circuit above only has Gain and ...
11
votes
4answers
555 views

Can a power MOSFET for switching application be used as a linear amplifier?

Power MOSFETs nowadays are ubiquitous and fairly cheap also at retail. In most datasheet I saw power MOSFETs are rated for switching, without mentioning any kind of linear applications. I'd like to ...
0
votes
0answers
14 views

Properly securing S/PDIF from voltage spikes

I'm working on a set of devices, each using a 75Ohm Coaxial S/PDIF input or output with a 1:1 transformer for ground separation. I was wondering what is the proper way to add transils or Zener diodes ...
2
votes
1answer
96 views

Why Do The Wires Inside a Headphone Cable Touch? Can't Wires Not Touch?

If you cut open the wire of a pair of headphones, say Apple Earbuds, there are a whole bunch of different cables inside that look (more or less) uninsulated. My understanding of Electronics is that ...
1
vote
2answers
90 views

Audio Jack Sound Signal?

I was experimenting with my laptop's audio jack port (the headphones one) and something that blew my mind happened. I took an AUX to AUX cable and connected it my laptop (so I could easily have access ...
0
votes
1answer
79 views

Deliberately Blowing Up an LM386N-4 Power Amp

This is a somewhat unusual, although hopefully not too irresponsible, question (I also hope it falls within the remit of this site, I can't think of anywhere else online where I'd get a trustworthy ...
4
votes
4answers
458 views

What is the difference between general purpose ADCs, Audio ADCs and video ADCs?

An ADC merely converts an analogue signal to a digital one. Why then do we have special ADCs for audio and video application? What if one was to use general purpose op-amp in them instead?
0
votes
2answers
43 views

Phone touchscreen malfunction when connecting audio circuit to it's jack

I use this circuit to convert audio signal to infrared signal and control my DSLR camera. It works fine on my laptop jack, but when I plug it to my smartphone jack, it shows some malfunctions in ...
0
votes
0answers
37 views

Preventing High Frequency EMI on Headphone Output

I am working a project with the following final power amplifier for audio output. What is best practice to prevent injecting RF EMI onto the cable from the MPU(tens of Mhz) and another radio ...
1
vote
1answer
32 views

Adding bluetooth input to old stereo

I am adding a bluetooth receiver to an old suitcase style record player / am radio. I have a bluetooth receiver which runs of 5v (usb normally). I have connected this to the volume pot, through the ...
0
votes
0answers
11 views

4 pole to 3 pole conection help

I have a head set on a motorbike coms system that I wan to split the audio off ( plug into a gopro's 3.5mm audio mic input) I have isolated the left + Left - Right + Right - The 3.5mm input on ...
0
votes
2answers
76 views

How to amplify both phone audio channels in this case (infrared remote)

I'm a photographer and have limited knowledge about electronics. recently I saw this circuit: which is explained here I tried to Build it, it works fine on my laptop jack, but does not work on my ...
0
votes
2answers
101 views

How can I convert an audio signal from a phone to 0-5v for a microcontroller? [duplicate]

I am trying to build a micro controller system where I input music from a phone/tablet and control the volume using a hardware keypad and do other stuff with the audio. I am trying to understand how ...
0
votes
3answers
59 views

When multiplexing audio do I need a pre-amplifier for each channel?

I am building a 16 channel multiplexer which will deliver the input from 16 microphones to a single ADC. I am clocking the ADC at 1.6 MHz and therefore sampling each audio channel at 100 kHz. The ADC ...
1
vote
1answer
72 views

How do I change the output volume of this audio amplifier circuit?

In the circuit below, where would I place an audio taper potentiometer to modulate the output volume level? Which of the resistors should get replaced with the pot and why? If understand ...
0
votes
1answer
46 views

How to design a single-ended to differential converter with audio transformer?

I am attempting to build an audio amplifier that accepts an arbitrary stereo input signal via a 3.5mm connector. My objective is to convert that single-ended input into a balanced AND differential ...
4
votes
4answers
179 views

Transfer Function for a combination of filters

simulate this circuit – Schematic created using CircuitLab I am currently working on trying to determine the transfer function for the audio tone circuit pictured. $$R_1 = t \times ...
-2
votes
3answers
89 views

Op Amps and High Pass Filters; Low Audio Volume [closed]

I'm working on an audio crossover for a friend's stereo system. I have a passive design that uses a single 330uF in series with the positive audio line. It works like a charm , but I'd like to see if ...
0
votes
1answer
23 views

VS1053 with SMD speaker, amplifier necessary?

I am working on device that looks a bit like a tablet. It consists of a display and a software controlled by touch on it. It uses the SAMA5D3 MCU from Atmel running linux. I decided to implement ...
2
votes
1answer
105 views

Can you identify this Bose car amp burned part? [closed]

Many more pictures here The radio and amp stopped working after a battery jumpstart. I fixed the radio by simply changing a fuse but the amp has a burned part. I tried contacting Bose to no avail. ...
1
vote
1answer
29 views

Audio High Pass Crossover Question

I'm doing a sound system for\with a friend of mine (I've done many, many before).... In the past I've done either simple L\C or LC crossovers, but I've been looking around for something I can build ...
1
vote
1answer
41 views

4 pole to 3.5mm female

I have a circuit board I took from a broken wireless headset, and I plan of reusing it by soldering a 3.5mm plug to where the speakers was connected. So I could plugin whatever headset I want. But ...
0
votes
0answers
17 views

How to stream audio over bluetooth to a device, use a bluetooth modeule with AVR atmega32?

I am trying to finish off a project I am working on that consists of an AVR atmega32 MCU and an on-board op-amp for audio amplification. Currently the device uses a hard wired connection for an audio ...
0
votes
1answer
51 views

Sending power to passive subwoofer via RCA connections

I have a home theater receiver with a powered subwoofer output and a matching passive subwoofer. I've always connected these two items using speaker wire. Recently I moved into a place that has ...
1
vote
3answers
72 views

Convert MP3 recording of data casette to serial data

I have a retro EMCO F1P CNC machine with a matching M1 controller that comes with mini data cassettes containing the "Machine State Data" which must be fed into registers of the controller before ...
1
vote
2answers
103 views

What is the purpose of a turntable's ground wire?

Many turntables, such as the ever popular Technics SL-1200 mk2 have a separate ground wire which attaches to the chassis of the mixer or preamp you have your turntable connected to. It's also a ...
15
votes
2answers
2k views

White hairs inside a headphones cable

I have a cheap set of Phillips SHE3000 earphones with a broken wire on the plug. Since I was repairing another set of headphones, with the same problem, I bought an extra plug, just to try repairing ...
0
votes
1answer
188 views

Class AB amplifier Design help

I need help designing a class ab amplifier to power an 8 ohm 0.2W speaker to create an alarm sound. I'm outputting a sine wave at 150Hz and 5Vpp from a TI microprocessor. Questions 1: A class AB ...
0
votes
0answers
42 views

Audio recorder takes more time than expected

I'm building an Audio recorder with PIC32, that store the recorded audio in a SD card. I have a problem that happeans with both the compiler mikroC (using swap file) and MPLAB X IDE (using fatfs ...
0
votes
1answer
45 views

How to wire this component (-4dB audio)

Getting frustrated because I don't understand what this -4dB thing is in the circuit and I can't figure out how to wire it correctly or even if I have the right part. I have a 3.5mm mono audio jack ...
2
votes
1answer
134 views

Playing WAV audio files from an SD card on Wiring board?

I'm using the Wiring framework for building a custom alarm clock. So far, I've been able to work with several Arduino libraries on Wiring, just by including Wiring.h instead of Arduino.h, as ...
-2
votes
2answers
62 views

Suggestions for a simple microcontroller [closed]

Please suggest a simple digital solution for an equalizer implementation. I am not looking for any feature heavy DSP based IC, since my application only requires some minor adjustments on the bass and ...
1
vote
1answer
62 views

DC offset spike?

A week or so ago, I accidentally damaged one of the speakers of my audio system, most probably because of a loud and high-pitched distortion (noise? - it's basically a "pop" when ...
1
vote
1answer
51 views

is it possible to ignore the audio jack? [closed]

i would like to have a headphone jack with an on/off button, so that the jack will still be connected to the device (computer, phone etc') but the device would ignore it. does such a thing exist? and ...
1
vote
1answer
32 views

ASP solution for sound enhancement [closed]

I built a stereo speaker and to an extent it sounds good. But I noticed, by changing the EQ to "Rock" genre in my MP3 player, the instrument clarity became more clear and vocals were more fuller, ...
2
votes
1answer
40 views

Reading Flow Meters from Mic Port

I am attempting to read two hall-effect flow meters through the audio-in (mic) port of an Android device. I want to be able to read both flow meters independently. The audio-in port is a standard ...
0
votes
0answers
51 views

How to output audio using an altera DE0 FPGA?

I am working on a project that involves realtime image processing using altera DE0 fpga board. Due to the nature of the project I am also really interested in including audio output. However according ...