Questions tagged [audio]

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

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39 views

Using STM32 with ESP8266 to get radio stream and play it

I am using STM32F407 board to communicate with ESP8266 using AT commands. Goal is to have STM32 tell ESP8266 to go to a live radio link then get the stream and put it through a VS1053 and out to a ...
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1answer
42 views

DC bias differential amp for unipolar power supply?

The PCM1793 datasheet has a filtering and amplifier stage. I built this without realizing that it requires a bipolar power supply. I'd like to get it to work with a unipolar power supply. I don't have ...
2
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1answer
88 views

Why am I getting crackling / popping with my LM386 audio amplifier?

I am trying to diagnose why my LM386 (250mW version) audio amplifier is crackling when the volume is more than a few mV. I created the circuit according to the diagram on the datasheet with pin 7 and ...
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0answers
29 views

Choosing a transformer for a ready-made bipolar regulated power supply unit

I'm working on a 10W AB class power amplifier that I would like to power with an already assembled linear regulation board sold by Audiophonics: https://www.audiophonics.fr/fr/alimentations-regulees/...
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1answer
39 views

switching between multiple clock (I2S, audio)

I'm trying to draw a schematic that I need for selecting a single clock among four possible clock sources. I'd like to select the source using a simple 4 way mechanical switch. The sources are: 22....
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0answers
49 views

Increase input impedance of differential voltage amplifier without op amp?

For fun, I'm working on an audio project which calls for a differential voltage amplifier - something I don't have experience with yet. The circuit below is no good, because the differential amplifier ...
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0answers
52 views

Why is my voltage pulsing when using a DAC as an input to an OTA?

I'm using the LM13700 in an automatic gain control configuration to adjust the volume of a speaker based on the audio level perceived by the microphone. Both amplifiers on the chip are used: one to ...
1
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2answers
70 views

Finding the correct low-pass filter audio input cutoff frequency

This low-pass filter, taken from the Synthesizer Arturia Minibrute is rated at 15 MHz. $$\frac{1}{2\pi RC} = \frac{1}{2\pi \times 100\Omega \times 100\text{ pF}} = 15,915,494.3092$$ Why would you aim ...
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0answers
43 views

I need help amplifying the signal to my push-pull style MOSFET amplifier from an NPN BJT input

I have a signal coming into my C1815 GR331 NPN BJT, common emitter configuration with a 330 pF output capacitor on the collector coming into my push pull configuration with both IRF840 MOSFETs but my ...
0
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1answer
42 views

How do I calculate the coarse tune and fine tune register values of AY-3-8910 for a desired frequency?

I have hooked up an AY-3-8910 sound chip to an Arduino Nano and I am trying to get it to give me a square wave at a frequency of 440Hz on channel A. The datasheet for the AY-3-8910 says that the ...
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2answers
27 views

Calculating Passive Analog Output Filter for CS42448

I'm designing schematics with the audio codec CS42448. The datasheet suggests output filters and I chose to follow the passive filter recommendation. I'm not sure though how to follow the calculation ...
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2answers
323 views

Transfer function an active tone control circuit

I'm trying to calculate the transfer function of this circuit: As one of the answerers sugest on Explanation of 3 Tone Control Circuit , I tried to divide the circuit into 3 parts, the bass the mid ...
1
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1answer
59 views

Absolute value single supply op amp circuit on TL072 or MC4558

I would like to obtain an absolute value of input signal with TL072 or MC4558 op amps (or other amp) with single supply. When I connect the circuit upper one follows the signal and adds noise and ...
0
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2answers
102 views

SG3525A for modulating an audio signal for a class D audio amplifier

I am using the SG3525A IC to modulate an audio signal into PWM that is then used to drive MOSFETS for a class D audio amplifier. I have managed to design a circuit that outputs a 10kHz PWM signal. I ...
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6answers
196 views

Looking for a replacement rotary encoder, how do I select one? Are they all standard or universal?

I am looking for replacement rotary encoders for my Yamaha A4000 sampler. These samplers have a common problem where the encoders start to work poorly after time. It is Yamaha part number V4441800, ...
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1answer
70 views

Miniature speaker gets hot when no signal is fed to it

I encountered a problem with my TPA2005D1-based audio amplifier circuit. When there is no sound output (0V on the signal input to the amp.), the speaker I am using is getting very hot, in contrast to ...
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1answer
55 views

How come I can play audio in my ESP8266?

I'm currently messing with the ESP8266Audio Library. I uploaded a sketch to my ESP8266 that uses a HTTP stream of MP3 from the web and plays it using some MP3 decoder. So basically the loop looks like ...
1
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1answer
50 views

Adding LED feedback to a source selection switch

I am working on creating an amplifier with multiple input sources. I have implemented a 3P4T rotary switch to be able to select the audio source among 4 different ones : RCA, Phono, and 2 digital ...
1
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1answer
66 views

Eliminating DC Offset in a Class B Amplifier with a Single-Ended Supply

I am wondering if there is any way for me to eliminate the DC offset present in this Class B amplifier circuit. The circuit is to be used to amplify music for a subwoofer and, as I understand it, a ...
0
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1answer
60 views

How to balance resistance between speaker wires made of copper fabric?

I'm working on an art installation where the speaker wires are made of a copper fabric material, a relatively high resistance material. I understand this is not ideal for speakers, but due to ...
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3answers
87 views

What is a suitable equivalent to 2N5459 JFET? [closed]

I am attempting to build an audio limiter circuit which has a JFET as part of the BOM. This JFET is obsolete and no longer manufacturered. Can someone recommend an equivalent JFET or a way of ...
6
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2answers
100 views

Filtering audio noise in power supply to an IEPE accelerometer

I have an IEPE accelerometer (this one) that I'd like to connect to an audio recorder. IEPE accelerometers have two cables (signal and ground) and require 18-30V DC applied to the signal cable to ...
1
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1answer
64 views

System being subject to vibrations and G-forces : Crystal Oscillator or MEMS?

I'm planning on making an audio system that will be used in vibration-inducing environments (roller coaster rides that can reach up to 5/6G peaks and public transportation systems). One of its ...
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3answers
58 views

Can Bussed Grounds in Audio Patchbay Create a Ground Loop

I am working on a project to create a patchbay style interface for guitar pedals, wherein a set of guitar pedals can be routed in different configurations using TT cables (like the patchbay interfaces ...
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0answers
44 views

How does the LM386 boost the bass? [duplicate]

Can anyone explain me how the LM386 boosted the bass by just adding a 0.033uf capacitor in series with 10k potentiometer between pin 1 and 5?
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2answers
65 views

Audio amplifier : how to combine stereo output to mono input

In the following schematic, I would like to decode PCM audio from my Raspberry Pi and output the signal to a 3W speaker. The PAM8302 datasheet is quite light. I don't understand what the input levels ...
3
votes
2answers
89 views

Complex op-amp analysis for audio filter circuit help

This circuit is from the datasheet for a demo board for the CS4334 i2s audio DAC. I'd like some help analyzing the circuit. Not shown is the audio source, which is immediately before ALA and ARA. ...
3
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4answers
816 views

Impedance matching between two ("prosumer") audio devices [closed]

I would like to send an audio signal from a Presonus HP4 headphone amplifier to a Zoom H4n "handy" recorder, but I am having difficulty understanding the role of impedance in this setting. ...
1
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1answer
52 views

Is metal casing always recommended/expected for audio devices (for EMI protection)?

I am considering using a wooden enclosure for several homemade audio devices such as DI boxes and isolation transformers but I know that most all commercial products use metal casing. I have noted, ...
0
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0answers
58 views

Is an LM2596 sufficient as a 9 VDC power source for hi-fi audio applications?

I'm currently using an LM2596 DC-DC converter (as part of a break-out board) to power my TDA7318 mixer chip, which in turn gets audio signals from a sound HAT and an FM radio module. Input voltage is ...
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1answer
43 views

lowering output level of a phono preamp

I built a RIAA phono preamp that works great from these schematics: But the output level seems a bit too high. What would be the best way to lower it?
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2answers
47 views

audio signal replication

I'm building an active speaker and would like the audio in signal to be replicated to another speaker, in this way being able to create a chained system with several speakers. I'm afraid a direct &...
0
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1answer
87 views

Why is this dynamic microphone grounded / wired with more than the two pins? is it important?

I am rewiring a dynamic microphone that does not require any phantom power (also wicked simple no off / on), and I noticed, when I only wire the two wires to two of the three pins it still works and ...
0
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2answers
65 views

OPA344NA op-amp MEMS Mic

I'm planning on getting Audio Data from a MEMS Analog Microphone with an OPA344Nna as the OP-AMP. I'd like to just make sure the audio circuit looks correct. (Analog/Audio is something a bit new to me,...
0
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1answer
57 views

CS8406 Audio Interface (I2S->I2C)

I'm attempting to interface a MEMS Microphone with an ESP32 through a CS8406. I am aware that the ESP32 has a well-documented I2S hardware interface however for my project I cannot use it. (It's going ...
2
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1answer
175 views

Building a matrix audio mixer

I'd like to build a 4 in, 4 out, 9 V powered audio matrix mixer. Basically it's a mixer where each input has a knob to control the amount sent to each output, effectively forming a routing matrix, ...
-1
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1answer
98 views

STM32 for audio processing [closed]

I'm working on a project. I do not know which microcontroller to use for real-time audio processing, and I want to recognize the peak with it. I have already implemented this program with Raspberry Pi....
6
votes
1answer
159 views

Where might the noise be coming from?

Background I'm a complete noob with electronics, trying to design a guitar effects pedal. There is a bit of crackle when I connect a pair of headphones to the output, but the audio signal is still ...
1
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1answer
87 views

STM32-based USB microphone produces hiss

I'm building a USB microphone based on STM32F407 discovery board, it captures audio but produces quiet but noticeable hiss with its spectrum shown below: I'm using oversampling to get additional 2 ...
0
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2answers
71 views

Could an analog synthesiser be made to run on USB power 2.5W?

5V USB is now standard and very convenient. But I see a lot of synths and audio projects working with higher voltages ... from 9V to 12V to 22V etc. Are there physics reasons for this? In that ...
1
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2answers
232 views

Problem with class-A amplifier

Update: I'm writing this because some people might think that this is homework. I have built a high power class-AB amplifier to connect it to a subwoofer of 2x2ohm 800W RMS. My main problem is that ...
0
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1answer
57 views

What is Analog Ground in UDA1334A?

I purchased Adafruit's UDA1334A I2S Stereo DAC, and I'm trying to figure out how to wire it to speakers. I see I have the Lout and Rout pins, which I suppose is the positive for the left and right ...
0
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1answer
46 views

Capacitor and Resistor Values on Headphone Amp Out (highpass filter)

I'm more of a programmer than someone who knows electronics. Just trying to figure out what forumlas/method to get the right capacitor and resistor values in my headphone out circuit here. Would you ...
1
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2answers
191 views

Why should the "shell" of an XLR connector not be connected to pin 1?

I don't quite understand the grounding strategy of XLR connectors. The Wikipedia article on XLR 3-pin says the following: AES standards mentioned above recommend that shells of cable-mounted ...
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1answer
77 views

Custom breadboard manufacturers [closed]

I'm not sure if this is the right StackExchange for this, but I'm interested in whether it's possible to get some custom breadboards made. That is some solderless prototyping breadboards with a couple ...
4
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1answer
359 views

Unknown schematic symbol (circle with 'c' )

Came across this symbol while working on a shorted Pioneer Integrated Amp It's the circle with a C in the center. It looks like only one leg is connected.
2
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0answers
91 views

Active low pass filter built around an LM386

I have some theoretical electronics knowledge from uni, but when it comes to applying it in practice, things can get a little bit complicated. I've built simple stomp box, basically a piezo transducer ...
0
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3answers
138 views

Op amp introduces phase shift at high audio frequencies

Context: I am trying to design a solid-state microphone preamp using dedicated audio op amps (ex: API 2520). Goals: flat ≈60-66dB of gain from 20Hz to 20Khz Limit changes in phase shift as much as ...
0
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0answers
40 views

Balanced Mono XLR output to Unbalanced Stereo Input

I have an Allen & Heath ZED-10 mixer with a balanced XLR output. All signals coming into this mixer are mono and therefore we were going to use a single balanced mono XLR main output (Left channel)...
0
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0answers
47 views

TDA7266D audio amplifier quashing signal with higher voltages

I'm working with the TDA7266D dual bridge audio amp. https://www.st.com/en/audio-ics/tda7266d.html#documentation The datasheet indicates that the device can operate with VCC between 3.5V and 12V. I'm ...

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