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Questions tagged [audio]

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

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29 views

Aux Cable in car

Aux Cable My 08 Cadillac Escalade has an aux cable connected through the back of the radio (done before I purchased) the aux cable had a 30 pin iPod/iPhone connector at the end of it. I was using a 30 ...
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2answers
65 views

Hardware audio mixing

I'm having a hard time trying to understand some basic sound engineering concepts. From https://en.wikipedia.org/wiki/Original_Chip_Set#Paula: Paula has four DMA-driven 8-bit PCM sample sound ...
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28 views

USB DAC for 8 audio channels [on hold]

I am a complete newbie to building electric circuits and I think this project is a touch to much to start with, but nevertheless I would like to know whether there is a way to accomplish what I'm ...
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30 views

Use Rasberry Pi and UltraSonic Speaker Transducer to generate tones from 40 kHz through 60 kHz [on hold]

I would like to build a device that can be controlled via a Pi that will allow me to control a tone, pitch and volume of a sound ranging from 40 kHz to 60 kHz. I believe I have found a decent speaker ...
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0answers
27 views

Creating a TRRS cable that route the audio from the Left channel to the microphone

So I have an audio interface that output audio via TRS socket what I want to do is to use my iPhone to record the audio coming out from the audio interface. What I tried is to create a custom cable. ...
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2answers
81 views

What's wrong with my1943/5200 Mosfet Amplifier? Blown on first run

I have just brought an 1943/5200 mosfet based amplifier board. Shopkeeper said it's rated for 24-0-24 AC. So I connected it with 24-0-24 transformer like this in image below. As soon as I turned the ...
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1answer
19 views

Impedance matching between CSR8675 and a MM20 microphone

I'm building my own (rugged) headphone. I am planning to use a MM20-33639-000 microphone with CSR8675 DSP. My question here relates to impedance matching. Based on what I have read, most modern ...
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1answer
33 views

Issues with HUM on DIY audio signal switcher using a relay

I am creating a rack mounted system for toggling multiple guitar pedal effects remotely through a footswitch. The idea is that I create a signal chain starting with the output of a guitar and that ...
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1answer
92 views

Voice encryption over TRRS headphones

-- Edit 2 --- This question is different from Connect STM32 BLUEPILL to the TRRS connector on the computer But just in case for not falling into double posting I deleted that post. (This post hes ...
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1answer
55 views

Voltage divider to drop volume of one speaker by 1.5dB

I have a a balanced stereo audio source, being fed into a headphone amplifier. Both source and amplifier are connected via a pair of 3-pin XLR cables, one for each channel. The amplifier then outputs ...
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2answers
65 views

Audio amplifier for 600 ohm headphones

I am working on a design which must drive an audio output into 600 ohm headphones (aviation headsets). Normally, I would just use an off-the-shelf class D amplifier but I can only find ICs designed to ...
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1answer
204 views

How do I appropriately power a headphone amplifier and where do I place the volume regulating potentiometers?

At the moment I am building a device that splits an analog stereo audio signal into 3 signals and amplifies 2 signals for headphones. I need to know how to supply -12VDC and where to put the volume ...
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6answers
174 views

How do I set my speakers out of phase?

A little bit of context: I'm doing a project for my physics class where I could choose the topic, and I chose to do phases in sound and noise cancellation (wavelengths and frequencies). Essentially, ...
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0answers
64 views

Not getting smooth sine wave on the output of the power audio amplifier

Power audio amplifier circuit not giving me an smooth sine wave output. Before iIadded the active bandpass filter I was getting smooth sine wave output with a current of 500 mA peak and 4V peak and ...
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1answer
91 views

THAT4315 audio analyzer - capacitors getting hot

I have designed a audio spectrum analyzer circuit with THAT4315 and a drivers for IN-13 bar graph nixie tube to visualize the signal level. To supply +-12V to the opamps, the Meanwell NSD15 module is ...
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1answer
27 views

Class a amplifier load capacitance

What would happen in a class a amplifier if I connect a capacitor in series with the load resistor (between power supply and the transistor collector)? My goal was to block the dc qiescent current to ...
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0answers
52 views

audio output on my FPGA

I asked a very bad question related to this yesterday, sorry - this is more comprehensive and makes more sense. this is the manual for the nexys 4 FPGA i'm using https://reference.digilentinc.com/...
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1answer
32 views

Powering a Behringer MicroMIX MX400 - Car Audio Application [closed]

I am installing a car audio system that will have TWO aux inputs; one in the dash and one in the rear passanger seat are. I decided to purchase the Behringer MicroMIX MX400 mixer. The power spec for ...
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1answer
29 views

TWO 3.5mm AUX sockets to ONE 3.5 AUX plug - Car Audio Application

I am putting together a car audio system and replacing the factory stereo with a new aftermarket head unit that has a single aux input. The vehicle comes with a single OEM aux input jack in the dash. ...
0
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1answer
28 views

Can I use a P2 jack to capture audio? [closed]

I'm new to StackExchange. I would like to know if it is possible to use a P2 connector to capture audio. I already use it to play audio on headphones but I plan to pick up the audio from a ...
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1answer
30 views

Connecting two electret microphones to computer to record stereo sound

I have two electret microphones. I would like to connect them to my computer to record stereo sound. I've checked a couple videos on YouTube and people there show they connect them "directly": signal ...
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2answers
80 views

Is my amplifier correct?

My goal was to amplify audio signal coming from Raspberry PI's audio jack, so it is louder. I have basically no clue what I am doing, but it seems to work - when I connect the speaker directly to the ...
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0answers
27 views

How To Create Voltage References in Combination Clipper

Context I'm trying to read audio from a headphone jack into a WeMos D1 Mini. I measured the AC voltage of my PC's audio out to be ~800mv when it's at full volume for a 1000Hz sine... but then I also ...
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3answers
52 views

Output impedance and loudness

I've a DAC for headphones (GeekOut 720) which has two output jacks with different impedances: 47 Ohm (with a large headphone icon next to it) and 0.47 Ohm (with a small headphone icon next to it). I'...
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2answers
33 views

Battery to replace by adapter

radio having DC 7.4 V 1000 mA battery, giving 3 hours back up play back. Now want to replace battery and directly on DC adapter and do not want back up, but plug and play. So what should be the ...
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2answers
79 views

Ticking noise from guitar pedal attempt

I am working on a tremolo guitar pedal circuit. A tremolo pedal basically attenuates the guitar signal using a pattern. Most tremolos use a combination of LEDs and LDRs to do this, but since I do not ...
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2answers
73 views

Not getting an ac current output through my speaker in my amplifier circuit

Will the dc current output affect the speaker, and prevent it from functioning properly? I have already tried different capacitors also change the input voltages and frequencies. I would really ...
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1answer
45 views

How can I make a voice transmitter receiver? [closed]

How can make a system which have two circuit. And one is place at ground floor and another is in roof. We send voice (like call) one from other by pushing a switch and vice versa. It may be wired ...
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0answers
42 views

What happens to the output of a speaker when a square wave is input

I have an experimental set up where I feed a speaker a square wave and then observe the output of that speaker with a microphone. After plotting my data I get the following shapes where Ch. 1 ...
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0answers
28 views

DIY headphone to mic converter works but not for iPhone or iPad

I made a simple and bushfixed headphone out to mic in converter/cable. It works with two 500 ohm resistors after de headphone left- and right out, 1 mF capacitor between the two 500 ohm resistors and ...
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2answers
59 views

How does the sound card process different incoming audio signals before outputting to the same speaker simultaneously?

Below is a primitive representation of audio flow in a PC: simulate this circuit – Schematic created using CircuitLab A program executes a code, after many steps in binary/transistor level ...
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1answer
48 views

“Ideal” way of using 3-conductor cable for unbalanced audio

I am intending to make some short (<30cm) unbalanced audio cables to interconnect devices on a musical instrument pedal board. As a matter of convenience, I was thinking of using some Belden 9451 ...
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1answer
100 views

Amplifying PWM Audio with an OpAmp

I have an 8 Ω speaker and a Raspberry Pi. To play sound, I can connect the Raspi directly to the speaker, which works, but with very limited volume. I assume this is because of the 3.3 V PWM output by ...
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0answers
28 views

How to measure the frequency response of a system that has a differential output?

I need to get the frequency response of a Class D amplifier that has a differential load. The positive & the negative of the load are both feedbacks to the system and the logic in turn drives the ...
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0answers
32 views

Using Digital Amplifier Daughter board in SONY Port Replicator Dock

I have a useless Sony port replicator model vgp-prav1, that has a digital amplifier board as in attached picture. I would like to ask if is it possible to use this amplifier externally? as far as ...
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0answers
44 views

Protection for excessive audio power to earphone

I made a microphone pre-amplifier like this: (Schematic source) I want to use it as spy system e.g. to hear something very far away, perhaps with a parabolic reflector. How we can reduce or cutoff ...
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2answers
51 views

Is it better to control an amplitude of audio signal or gain?

I'm creating simple headphones amplifier with an opamp (basic non-inverting config with RC high-pass on NI) and I wonder, what's better - to control an amplitude of input signal, or a gain of an opamp?...
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2answers
120 views

Bose QC20 in-ear headphones 50Hz buzzing noise on PC

When I plug my Bose QC20 on the PC, I hear a low volume 50Hz buzzing noise. Some interesting facts: When I touch a metal part (PC case, keyboard) the noise is gone. I have this noise on all USB ...
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1answer
26 views

Continuous, frequency-domain digital equalizer

I'm facing a real case of DSP application. I have a basic knowledge of digital filtering and telecommunication issues. The input of my "black-box" is a digital audio signal (say a common WAV file, ...
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0answers
49 views

Strange noise from speaker

I have speaker connected to raspberry pi through amplifier circuit. But I have this annoying noise coming form speaker. Could anybody help me? I have motors connected to same battery and one linear ...
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1answer
52 views

Audio jack detection to turn on device without power loss

I'm trying to make simple headphones amp and I wonder - is there any way to use stereo jack connector with N-C switches like this: to turn on the amp so the battery is mechanically disconnected? I ...
3
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1answer
112 views

In usb C to audio jack systems, is the DAC in the dongle or in the host? [closed]

I'd like to design my usb-c audio preamp, but that would be possible only if the analog audio comes directly from the phone, so that my piece of hardware can take the power supply from the usb-c and ...
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1answer
46 views

MOSFET driver circuit configuration for half bridge MOSFETs for power amplifier

I am making a class D audio amplifier and I am using a MOSFET driver to control two MOSFETs in a half bridge configuration as shown in the circuit below When I connected the circuit without the ...
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2answers
96 views

Why high quality broadcast studio monitors use a middle range AB amplifier?

I had an issue with my Genelec 8010A studio monitors. Until recently I was truly happy with these monitors. The sound quality is exceptional, pure, precise the dynamic is impressive even though you ...
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1answer
56 views

OpAmp choice and circuit configuration for DAC amplification to speaker

For a school project we're using a uC with a DAC which outputs values between 0V-3.3V, which we want to amplify and feed into a speaker. We haven't settled for a particular speaker but considering it ...
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2answers
66 views

Extension of Audio Amplifier's Bandwidth

I am curious, whether extending audio amplifier's BW (bandwidth) beyond 20 kHz has any benefits compared to 2Hz-20kHz audio BW amplifier? Some say that high-frequency -3dB point should should be ...
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0answers
49 views

A question about generating low frequency sine waves by a soundcard

As a part of a bigger experiment I need to control the frequency of a speaker by a PC through a MOSFET amplifier. The rest is someone else will use that speaker output for some mechanical application ...
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1answer
31 views

audio, LTspice - crossover simulation problems

I am currently trying to design an x-over. The response of what I have spiced does not correlate to what I though would happen. Have I made any obvious mistakes? I want a Sallen-key HP/LP. That ...
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0answers
52 views

Identifying Noise in 12AU7 Based Headphone Amplifier

I've been working on making a tube based headphone amplifier as a fun personal project. The amplifier is based around this 12AU7 vacuum tube. The project for the most part is following this existing ...
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1answer
36 views

Audio Frequency Response Offset in dB

Say I have some audio device with the following absolute frequency response: I want to shift the curve up, so that the 1kHz point is the 0dB point, and everything else is relative to this point. Am I ...