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Questions tagged [audio]

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

1
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2answers
73 views

Can I change op-amp supply voltage without affecting circuit behaviour

I am working on an audio project which is based upon various sections of several different schematics from various old musical instruments. I want to make a test board that has multiple different ...
0
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2answers
38 views

Mono to Stereo Pan Knob

I am trying to make a small box to take the mono audio output form my analog synth and run it through a panning knob so I can control where in the stereo mix the mono signal is placed. The goal is to ...
0
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0answers
27 views

How to change channel to in0 to in1 after 1 convertion

I am using stm32f103c8t6 board, using in0 to in3 4 channels for getting information from other hardware. i am new to stm32 so I don't know how to change the channel from in0 to in1 after 1 convertion. ...
0
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1answer
28 views

Wires coming out of a pigtail cable

There's a audio 3.5mm to pigtail cable on sell at Adafruit: https://www.adafruit.com/product/1700 It looks like what I need as I could connect one side to an old phone, play some music and the loose ...
0
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0answers
39 views

Odd Ground/Power(?) issue with Mixing Desk - alternate grounding?

I am a bit stumped with this one. Unfortunately there are a few variables involved, but I will do my best to ask an answerable question.... I just built a DIY synthesizer. It functions absolutely ...
0
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2answers
36 views

Replacing a Capacitor on an Onkyo HT-R960 A/V Receiver

I have an Onkyo HT-R960 receiver that's been acting very flaky for the past couple of months. I've had to let it warm up for several minutes before being able to use it. I would also have to turn it ...
0
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0answers
37 views

Cloning an AM Signal using coil and phone audio jack [closed]

So let me get the end goal out there first: I have a remote start on my vehicle and want to clone the (unencrypted) AM signal transmissions (start, lock, unlock) from my AM transmitter remote and ...
1
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2answers
61 views

Speakers make humming sound [closed]

I don't know if this is the correct forum to ask this, but I have a problem with my audio set up. The setup goes as follows: PC -> external audio card (via usb from pc) -> stereo equalizer mixer (via ...
4
votes
1answer
236 views

Audio filtering circuit with capacitor shorted

I was looking at the Adafruit FONA cellular network modem breakout board schematic and found something that I can't quite understand. The breakout board has an audio input and output that both goes ...
2
votes
2answers
74 views

Feasibility of custom parabolic mic (amplified, bandpass filtered) for use with mobile phone app [closed]

I am not an electrical engineer, but I am up for a challenge and this is my first venture into electrical engineering. However I am beginning to think this may be a step to far! As a hobby I survey ...
0
votes
4answers
53 views

simplest way to create an activatable alarm on a speaker?

I have made a circuit that produces a 3.3V high when its active and 0V when it is off. Now I would like to extend it with a speaker that plays some sort of alarm (although it shouldn't be too ...
0
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0answers
66 views

Connect DAC 12 bit (STM32F429) to audio line in of class D amplifier

Is it possible to connect the 12 bit DAC of STM32F429 directly to the audio in of XH-M189 amplifier module (for example)? What precautions must be taken into account? The connection of DAC to XH-M189 ...
4
votes
4answers
518 views

Use audio frequency to light up multiple LEDs

Need some help here - I need to light up about 20 different LEDs based on the frequency input(200 Hz-20,000 Hz) Eg: The circuit should light up the 1'st LED when the input frequency is between ...
0
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0answers
45 views

Mixing analog audio signals with resistors

I am creating a type of mixer for 2 audio inputs into 1 output so i can use 1 pair of headphones with 2 computers without buying an expensive mixer with a amp Currently i have 1k 1/2W metal resistors ...
1
vote
1answer
52 views

Unstability with tda 2002 bridge configuration

I'm trying, for MONTHS (obviously not everyday, but I spent at least more than 80 hours on this) to do a 15 W audio amplifier with two TDA 2002's in a bridge configuration, following the circuit ...
0
votes
1answer
24 views

PCM270xC USB audio DAC, power modes and THD

I am designing a USB DAC for headphone use, and planing to use a TI PCM270xC IC. There are two power modes: (USB) bus powered, and self powered. What I'm trying to understand is how does the power ...
3
votes
0answers
76 views

Enhancing the bass response of an audio isolation transformer

Below is a simple buffer circuit using an isolation transformer : The green trace is the output of the transformer and the blue trace is the input signal (20hz to 20Khz sine wave). As you can see the ...
5
votes
2answers
425 views

Trying a PWM audio application. I can't figure out why I'm getting a loud beep overlapping my sound

I want to play some short audio clips (they range from 50ms to 100ms) from my atmega168 microcontroller and output it to a cheap speaker. I was following this tutorial but because I'm using a ...
0
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2answers
75 views

Hardware audio mixing [closed]

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 ...
0
votes
1answer
56 views

How to mute microphone in 2-way communication when the speaker is active?

I'm making my own two way intercom for my house. There will be a speaker and microphone above the front door of my house (as well as a camera). When someone rings my doorbell, I get a notification on ...
1
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0answers
31 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. ...
2
votes
2answers
99 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 ...
0
votes
1answer
20 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 ...
1
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1answer
45 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 ...
-1
votes
1answer
104 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 ...
2
votes
1answer
63 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 ...
0
votes
2answers
79 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 ...
4
votes
1answer
210 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 ...
0
votes
6answers
177 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, ...
0
votes
1answer
97 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 ...
0
votes
1answer
29 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 ...
1
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0answers
60 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/...
1
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1answer
38 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 ...
0
votes
1answer
30 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
votes
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 ...
0
votes
1answer
43 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 ...
0
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2answers
84 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 ...
-1
votes
0answers
34 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 ...
1
vote
3answers
56 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'...
0
votes
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 ...
0
votes
2answers
89 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 ...
0
votes
2answers
74 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 ...
0
votes
1answer
47 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 ...
-1
votes
0answers
29 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 ...
2
votes
2answers
61 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 ...
1
vote
1answer
52 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 ...
0
votes
1answer
116 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 ...
-1
votes
0answers
33 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 ...
0
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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 ...
0
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2answers
54 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?...