Questions tagged [audio]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
67 views

Tube amplifier with buzz

I built a tube (UK: valve) amplifier but it has one problem. When I turn it on, it starts buzzing at 150 Hz but only if I connect the audio output transformer. If I directly connect the speaker to the ...
0
votes
4answers
105 views

How did using the shield as signal return end up as a common practice in audio?

Or in short: was cost the only motivation? Because the major reason against this practice must have been already plain obvious in the mid of last century. Namely, using the shield of a cable as signal ...
0
votes
0answers
31 views

Is there such thing as a TMDS decoder IC or device?

I am interested in measuring audio latency of an HDMI sink device (DUT). I have an 8K Murideo Seven Generator, but I believe that its audio latency measurements may be off by 15 or 20 ms, so I would ...
3
votes
4answers
257 views

How to implement a ground loop isolator in an audio circuit that connects to USB and line out of a laptop?

I'm working on an audio interface that utilises a microcontroller and a CS42448 audio codec. When receiving USB power and receiving audio from a laptop, there is a ground loop. Otherwise, it works ...
0
votes
2answers
171 views

Discrete amplifier not passing audio

I have a card that can receive two dual input opamp with feedback. The card is currently connected to V+ and V- only for taking measurements. The +24V rail is doing great. I also know for sure that ...
0
votes
1answer
98 views

I would like some feedback on my circuit design based on a DIY op amp circuit

I am following a design based on GreatScott's DIY or buy microphone op amp. I made some modifications and changes regarding the design, and made the schematic using Fritzing. This is my first time ...
1
vote
1answer
132 views

Audio power amplifier design help

For a school project, I need to design an 8 W audio amplifier with BJTs. The power supply is from 9 V to -9 V and the input is 0.8 Vp 1 kHz. A speaker with 8-ohm impedance and a voltage gain of 10 is ...
1
vote
0answers
54 views

Best way to output n digital signals using n-1 DAC channels

I have 3 digital signals that need to be mixed and output into the analog domain. My DAC has 2 channels (Left and Right). The way I see it, I can: mix the signals 1, 2, and 3 digitally and output ...
1
vote
4answers
143 views

Help needed reading an audio transformer wiring schematic & impedance table

I am trying to link a transformer's schematic to its impedance table. I have trouble linking the values to the indivual pins. For now I would like to use it exactly like in the picture. My ...
-1
votes
0answers
68 views

Piezo voltage generator that mutes the audio signal

I am new to the forum and PCB/circuits altogether so please go easy on me! I'm a solo musician working on a percussion foot pedal for my performances. The basic idea is you stomp your foot on the ...
5
votes
2answers
2k views

Achieving bit-perfect rendering of audio CDs

I am aiming to get bit-perfect rendering of audio CDs and wondering about the necessary configuration. Currently I have: A high-end CD transport without a word clock A high-end RME sound card with a ...
1
vote
1answer
91 views

Switch for piano sound output

I have a Kawai CN27 piano. Currently if you plug headphones into the piano, it detects that and turns off the speakers. My goal is to have the headphones always plugged in and have a switch to select ...
0
votes
0answers
51 views

No sound from I2S codec

I have a STM32F411R Nucleo board and I'm trying to connect it to a CS4245 audio codec to play audio but I can't get any sound out of it. The connections are: Nucleo CS4245 PB10 (I2S3 MCLK) 40 (MCLK2)...
0
votes
1answer
30 views

Get AES/EBU signal from S/Pdif

Recently on the road with an Audio Engineer, I've heared that (Coaxial) S/PDIF and AES/EBU are quite similar and could be passively adapted, and said that these two signals are the same on the logic ...
0
votes
1answer
40 views

Microphone not working on 3d sound card [closed]

I am trying to connect an old phone receiver to a raspberry pi. the receiver has two wires for the speaker and two for the microphone. Following a tutorial online I solder the connection of each to ...
-1
votes
1answer
46 views

RLC circuit: change R and C because of constraint in L

I am trying to build this circuit, but I can only find 47 μH inductors. Is there any way I can change R and C to get an equivalent circuit?
0
votes
2answers
41 views

How can I read audio files from CDs using a transport which is TOSlink only?

I have a CD transport and DAC which both take TOSlink connections. So, I can connect the transport to the DAC and that works fine. However, in some cases I want to rip a CD so I can combine songs from ...
-2
votes
1answer
85 views

Audio over radio in neighbourhood, possible and legal? [closed]

In my neighbourhood there are three five-year-old friends (including my kid) that live within a radius of 450m of each other. I had an idea that it would be fun if they could have some kind of push-to-...
-3
votes
1answer
64 views

How can I design a low cost fully differential op amp using a generic op-amp (audio purpose) [closed]

can I replace this fully differential Op-amp (OPA1632) with a generic op-amp based design ( Figure 2: Using NE5532). The Application area is audio signal handling. Input: Differential input / ...
1
vote
3answers
111 views

Class AB amplifier design using op-amp

I'm currently working on an audio amplifier (first-time). To facilitate the negative feedback I decided using an Opamp to keep the circuit simple. I ended up with a simple emitter follower and a Vbe-...
2
votes
5answers
182 views

Series or parallel LC in an AM radio?

All transistor radio circuits (not crystal) on the internet seem to use an antenna and parallel LC circuit. Why does no one use series LC circuits to select stations? To my knowledge, series LC ...
0
votes
0answers
38 views

Filter for AC line coupling with audio signal source

I need a sharp notch filter (higher order) for the 50-60 Hz band, to be placed between AC 220/125 V power line and an audio source (not necessarily amplified), such that the input signal from the ...
2
votes
2answers
95 views

SPDIF to CMOS logic

I am trying to get around my head on the three questions below. Is SPDIF protocol is really driving 0.5 V pk-pk without having any DC offset? If yes, HDMI1.4 mentions ARC protocol which is adhered ...
0
votes
3answers
161 views

How can I drive one speaker with a stereo signal? [closed]

I’m building a small Bluetooth speaker based on a board (DW-CT14+) that outputs two amplified audio signals (left and right stereo channels). I only have room for one speaker in my device so I need to ...
1
vote
2answers
68 views

TDA7575B-based audio amplifier design

I am designing a PCB using the TDA7575B. Schematic below. I have a single input. It is passed through a filter (potentiometers, capacitors and resistors) for tone control and then fed to the TDA7575B. ...
0
votes
3answers
83 views

Can I use another pin instead of VIN?

I'm currently trying to copy a setup (seen below) for an audio player using an ESP32-S2-Saola-1 instead of an ESP32-Wroom. The problem is that the ESP32-S2-Saola-1 doesn't have a VIN pin. Can I use ...
0
votes
2answers
68 views

THAT1646 Distortion on output signal

I am working on an audio project using the THAT1646 balanced output driver (project is a hi-fi mixer for studio insert gear). The project uses a bipolar +/-15V supply. I am experiencing distortion on ...
0
votes
1answer
57 views

Connecting Google Home To Arduino - Issues with ground

I am attempting to connect my google home to an Arduino so I can read when the speaker is on. (This will control a Big Mouth Billy Bass but that is not relevant here.) When the speaker (google home) ...
5
votes
3answers
2k views

What is the minimum width of a PCB track for analog audio signals?

On a circuit board with a mixer chip (and some auxiliary components like coupling capacitors), I have to lay a number of tracks (35 µ copper layer on epoxy substrate; max. track length: 120 mm). The ...
0
votes
4answers
102 views

Parallel electret microphones

I want to make an electret microphone setup for my accordion. 4 mics on the treble side and 2 on the bass side. Would I need a preamp for each mic and then mix the outputs using an opamp? Or would it ...
1
vote
1answer
46 views

Are "switched" TRS connector pins (sense pins) suitable for audio multiplexing?

TRS jacks are commonly available with "switched" or "sense" contacts, like this: This form is commonly used to ground the input pins when nothing is plugged in. But can these ...
1
vote
1answer
81 views

BJT Amplifier Simulation

I am trying to build a simple CE amplifier for an AM signal as part of a home-brewed transistor radio. I would like to have a working simulation before I get a breadboard. My simulation works in small ...
9
votes
2answers
691 views

LM386 amplifier circuit

I am building an audio amplifier with LM386 with a voltage supply of 5 V. The input signal is 50-250 mV. Can anybody tell me why there is a resistor and capacitor in series at the output? As the value ...
1
vote
0answers
60 views

Electret microphone: convert sound to current or resistance?

See this picture (from Wikipedia): The electret microphone consists of a capacitor with a static charge and a JFET. I wonder how the electrical signal relates to the sound signal. I understand that ...
1
vote
1answer
52 views

Removing noise generated by a servo from an audio signal

Background I'm working on an Arduino-based audio visualisation project where I run an audio signal into the Arduino, using an FFT to calculate the intensities at different frequencies and then using ...
-3
votes
1answer
179 views

Why are MOSFETs good for audio output?

As title. I read some articles that says MOSFETs are good for audio output transistors and that MOSFETs act like tubes in most case. Here is the article says why it's good: SCIENTIFIC PUBLICATION The ...
0
votes
1answer
50 views

Headphone and speaker switching

I am having difficulty with a headphone plugged in and speaker mute configuration. I am using the SJ-3524-SMT-TR headphone jack and the TPA711DGN audio amplifier IC. What circuitry should I use with ...
1
vote
2answers
93 views

I2S voltage shifters needed?

I am designing the schematics for my new PCB and I need to output some audio signals (totally new to this). I am using an ESP32-SOLO-1 as MCU and the TFA9879HN as audio driver. The TFA9879HN is ...
-1
votes
1answer
37 views

Headphones on a line output (vs. headphones output)

I'm designing a device using a DAC (TI PCM 2704 like this one to be precise,) and optionally a headphones amplifier. I noticed that connecting (32 Ohms, closed-back Beyerdynamic) headphones to the ...
0
votes
1answer
33 views

Intel HDA connector - jack detection

Good morning/afternoon/evening I'm trying to resolve an issue related to Jack autodetection on an Intel motherboard In a nutshell, I'm using a home made simple adapter for the HDA connector on the ...
3
votes
4answers
213 views

Which components cause low humm and medium to high pitched buzz in this computer monitor? [closed]

I recently bought a ten year old 10-bit color fidelity computer monitor (NEC PA301W) that has brilliant display quality but to my sensitive ears has an audible/annoying low pitched humm noise along ...
0
votes
0answers
55 views

Suitable I2C Alternative for Audio Applications

I've been looking at using a MCP4725 12-bit DAC connected to a TPA2016 audio amplifier to drive a small 0.5W loudspeaker from a ATtiny85 on an existing circuit I have. I've quickly realised that the ...
1
vote
2answers
32 views

Bluetooth range extender for audio component

I have a Tascam CD-200BT audio component that is a Bluetooth receiver that I have installed in my school's gymnasium. Because of the location of the rack mount, I'm worried that the internal antenna ...
0
votes
1answer
69 views

Why do guitar pickup output levels not add?

I have noticed that when wiring guitar pickups together in parallel, the total output level is the level of the pickup with the lowest output. The output will be as loud as the quietest pickup. Why is ...
0
votes
1answer
59 views

USB port noise and how to deal with it, or avoid it?

I am designing and testing a DIY microphone. The idea is to amplify an electret mic signal before sending it to a PC's sound card to avoid using digital gain. The circuit just uses 2 opamp OPA2134PA, ...
0
votes
0answers
30 views

Connect amplified speaker output to microphone input

I am using a Sena 10r coms unit and I want to connect the output from the speakers to my GoPro wired mic input. The speakers are 70ohm 30mW each. How can I wire it to a 3.5mm jack? Most of the other ...
-3
votes
2answers
108 views

Preamp stage for audio amplifier using LM741CN clipping too early [duplicate]

I'm trying to build the preamp stage for an audio amplifier circuit using the LM741CN. I'm using a variable resistor for Rf so that I can vary the gain. What I'm finding is that when I have Rf set to ...
0
votes
0answers
48 views

Why does this wiring for double audio output not work?

I tried to connect two different audio jacks to the same guitar pickup. One I connected to my PC through a USB interface and the other to an amp. Neither output produced any sound. Is there something ...
1
vote
2answers
100 views

Simplest way to check if an audio level is line or micro?

I can check level audio on a VU Meter or dBFS meter. What's the simplest way to check if an input audio level is line or micro? Can I use a multimeter?
0
votes
1answer
49 views

Volume level control component? [closed]

does anybody know a component that can lower high volumes, but not the low ones, so the audio gets more equal? A component that can make audio more constant. Limit audio.

1
2 3 4 5
55