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

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This is a Tone audio generator. The 4046 generates a tone and TL074 controls its threshold audio. Please consider the LM393 schematic, its output is 0 or -5V. I want to connect the LM393 to this audio ...
HFAR's user avatar
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I was wanting a schematic review of my DAC-AMP using the XMOS-XU316 over I2S with a ES9039Q2M. Any input would be appreciated. The specs of the DAC are: 32 bit 768kHz Sample rate Here is the full ...
Luke S's user avatar
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I am designing a VCO-based ADC (the circuit is shown below) for sampling the audio signal. The design I refered to this post: Low frequency in this VCO design. But I instead of use it as a VCO only, I ...
Man TikZ's user avatar
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I am working on a sound synthesizer using an ATmega328. My synthesizer works for now, and has two voices. Of course I want these voices to be mixed and though I'd use an opamp for that. I have the ...
Bart Friederichs's user avatar
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I am designing my first audio crossover an I would like to have some opinions. It is for a 2 way speaker with a 8 inch woofer and 1 inch tweeter, here are the schematic and simulation result using ...
Simone Ambrosini's user avatar
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While I was measuring various things in this amplifier design so I could understand it better, I tried to use a square wave as a source signal. I used pulse voltage source, specified parameters and ...
DemoX's user avatar
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I am a bit confused with a circuit I've designed myself long time ago but only simulated on simulink and never built it. Now I've built it on a protoboard and I am getting some considerable deviations ...
Felipe_Ribas's user avatar
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I'm working on a project where I need to update an existing design to resolve an issue with the audio amplifier circuit overheating when the volume is set to HIGH. My approach was to replace the NPN ...
J. Street's user avatar
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So I have found this circuit from this website: https://sound-au.com/project202.htm As you can see in the picture there is the 9V battery powering the omp amps, but for the +4.5V, how is that ...
sirOrange17's user avatar
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I'm trying to design an audio source and output multiplexer/selector, to play audio from one of a few sources on one of a few output devices (so only one path active at any time). Everything will be ...
patpir's user avatar
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My TV audio line level out is connected to a pair of amplified speakers. The system lacks vocal clarity and I want to add a center channel to enhance dialogues. The passive technique is in below ...
wonderfuliot's user avatar
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I found this pre-amp circuit for a guitar pedal (i think) and I am struggling with the negative voltage. With my limited knowledge most guitar pedals these days (including all of mine) use a 0v to +...
Chris's user avatar
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I'm experimenting with the Valvecaster circuit, using a 12AU7 tube. Trying to add voltage control over the gain pot, I replaced VR1 with an NPN transistor. This works to some extent, but what I find ...
one_three_three_seven's user avatar
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Another user had a question about distortion in an audio amplifier. The culprit seemed to be oscillations around Q2-Q4. Here it is again for reference: Not having a lot of experience with class AB ...
pipe's user avatar
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I have a Sony F-99S microphone, with two dynamic capsules facing opposite directions. It was originally wired in stereo, with two unbalanced outputs. I am thinking I'll combine them to get a figure-8 ...
Kenzie's user avatar
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I inherited this PCB, I guess it's a high voltage, class AB amplifier. This is supposed to be the replacement an older version. Here's what the circuit looks like: The input signal looks clean, but ...
Fer's user avatar
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I have a couple of questions about the DC offset on the output of the power amplifier. Lately, I've been trying a couple of designs in LtSpice and I noticed that DC offset is much too high(or so I ...
DemoX's user avatar
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I'm self-learning about transistors. This circuit is from p 104 in Getting Started in Electronics by Forest M Mims III. Unfortunately he provides no explanation (most of the book is like this). Here ...
qwr's user avatar
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At the beginning, I wanted to say that English is not my first language, so I'm sorry for that. Also, it's probably a very stupid question, but I just want to know. Lately, I've been trying to learn ...
DemoX's user avatar
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I need to send analogue audio into a mobile phone, preferably using a USB cable. I have connected the audio output to the mic input on an ordinary analogue-to-USB converter for 3.5mm TRRS headsets, ...
Axemurder1's user avatar
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2 votes
1 answer
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Summary I've designed a beamforming circuit that uses two electret condenser microphones (ECMs) in a differential end-fire array and outputs to a bluetooth module's ADC for transmission. I explain my ...
Nolan Walker's user avatar
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7 votes
3 answers
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http://electronic-projects.50webs.com/555-based-siren-circuit.htm the source online, but who knows the original designer. U2 is configured to have a much higher frequency than U1. U2 provides the ...
qwr's user avatar
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I am trying to fix a vintage car radio, I have isolated the problem back to the power and buzzer daughterboard. The power button does not turn the radio on. The power button goes from OL to ~300 Ohms ...
S.Stevens's user avatar
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I am looking for op-amp based second order high pass shelving filter whose corner is set at 25Hz and by 18Hz it should be 15dB to 18dB down. Thats quite a steep roll-off. While there are other filters ...
wonderfuliot's user avatar
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I have the following circuit, where I am using a 100k digital potentiometer (DS1267B) to control the gain of an incoming audio signal. In an attempt to minimize the load on the input, I pass the ...
xulo's user avatar
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This circuit is a DIY vocoder, built from a PCB. Design is based on a commercial product from the 1980s, the Syntovox 222. original schematic simplified schematic The unit works normally but the quad ...
delta-9's user avatar
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3 votes
1 answer
210 views

First of all, let me describe what I want to achieve: Design an SPL meter with a measurement range from 30 dB to 130 dB (ideally up to 140 dB if possible). Use an electret condenser microphone with ...
Minh Trinh's user avatar
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1 answer
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Good evening, Is it possible to recreate this small audio transformer at home. There isn't enough information in the schematic is there?? Thank you for any guidance.
Robert's user avatar
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1 answer
134 views

I'm using the LM386 chip to amplify audio and I designed a circuit diagram for this purpose. Short request: I want to reach the goal of protecting its input avoiding signal distortion/degradation. A ...
Crazy circuit's user avatar
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1 vote
1 answer
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I'm porting some excellent open source MIDI synth code by Marcel Licence - for reference see https://github.com/marcel-licence/ml_synth_basic_example. Marcel already has working code for several MCU's ...
AtmosphEng's user avatar
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4 votes
4 answers
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I have a circuit made of high-pass and low-pass filters. It currently includes an input buffer, but I’m wondering whether that buffer is necessary. Removing it would let me fit the design into four ...
VALKYRIEiSr's user avatar
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2 votes
2 answers
385 views

I have a relay based audio line-out switching circuit. To drive the relays I was thinking of using a switch with an nMOS, but the issue was that when the switch is floating, both nMOS can conduct. I ...
ion gigel's user avatar
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2 votes
0 answers
108 views

Hello fellow engineers, I have a project where I'm trying to create a "virtual exchange" for these ancient Ericsson wall mounted telephones. The virtual exchange is based around a RasPi ...
QSL's user avatar
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4 votes
1 answer
405 views

When driving a 1kHz sine wave into a class D amplifier, I measure the frequency of the voltage ripple at the Vdd pins to be primarily 2kHz, of course with other harmonics of 1kHz at lower powers. My ...
tronhawk's user avatar
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I need an all-pass filter centered at 60Hz with adjustable Q factor for sharp roll-off and 180 degrees total phase shift. 0 degrees phase shift at higher frequencies and 180 degrees phase shift at ...
wonderfuliot's user avatar
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1 vote
1 answer
86 views

I disassembled HCD-RG295, its an audio system with CD, Decks, radio, and amplifier, and I want to take amplifier from it and make it work with aux, but I am not very much knowledgeable of what to do ...
Filip Avramovic's user avatar
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0 votes
2 answers
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An example of sound is similar to this video: https://youtu.be/fWlwKPlmWeM?si=Wkjh_yphI_JPgJJM&t=214 Schematic: PCB: There is a one-GSM module (EG25G-PCIe) near the module, approximately 50 mm ...
Maharshi Oza's user avatar
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1 answer
108 views

Maybe you can help me understand this: I have a situation like in the diagram below (excuse my poor drawing skills..), where I have a very small current small voltage signal in the audio frequency ...
AndrewW's user avatar
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1 vote
1 answer
114 views

I have a 30 year old car radio which is being fed with a noisy +12v rail, with engine RPM dependant whine being heard through the speakers, and visible on a scope in FFT mode as a peak from 2-5kHz in ...
S.Stevens's user avatar
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-1 votes
2 answers
77 views

I have designed a circuit composed of third-order Sallen-Key filters. The simple high-pass and low-pass filters are working without any issues. However, the band-pass filters don’t seem to output any ...
VALKYRIEiSr's user avatar
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1 vote
1 answer
131 views

I have been trying to trace engine noise being picked up by what is a faulty car head unit. I know it is the head unit itself as when trying a different unit, the noise disappears. I attempted to use ...
S.Stevens's user avatar
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1 vote
2 answers
125 views

I am trying to build a Wobbletron guitar pedal, and the schematic calls for the J201 transistor. I do not have J201s on hand and, being on a budget, would prefer not to have to buy them (only if ...
Sprexle's user avatar
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0 votes
0 answers
68 views

I’ve attached a schematic for a call station system I designed. It includes two preamp options, though only one will be assembled at a time. The input comes directly from a gooseneck microphone with ...
blendb's user avatar
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0 votes
1 answer
113 views

I designed a custom audio PCB. It is a digital synthesizer, with analog audio inputs and outputs, ADCs and DACs for conversion, and a Raspberry Pi CM4 board doing all the audio processing. I use an ...
Dani S.'s user avatar
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1 vote
1 answer
125 views

I have this PCB which uses a somewhat expensive and difficult to locally source tantalum capacitor as component C6. It is a microphone circuit using 48 V phantom power supplied thru 3-pin XLR, then ...
user3543's user avatar
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4 votes
1 answer
244 views

I'd like to use a MEMS microphone as external wired microphone for an audio recorder supplying 48 V phantom power thru a 3-pin XLR audio connector. Said MEMS microphone uses 3 V and as far as I can ...
user3543's user avatar
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0 votes
2 answers
261 views

I want to add sound to a microcontroller project, using PWM, and I came across this blog post with the circuit below. With a cutoff frequency of 100Hz, doesn't this heavily attenuate all audible sound ...
Mike's user avatar
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1 vote
1 answer
50 views

I'm pretty sure that the ES9218P outputs unbalanced audio, and not balanced, but I'm not a 100% on it.
KOEG's user avatar
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7 votes
1 answer
793 views

I'm trying to replace some burnt up components on a old (and hard to find) car stereo for my project car. There are limited markings. One says BA RU and the other says DA RU
Joshua Galer's user avatar
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0 votes
2 answers
139 views

I recently designed a PCB that uses multiple 3rd-order Sallen-Key filters. While testing the circuit before designing the PCB, I had used ceramic capacitors. I assumed that for the PCB, electrolytic ...
VALKYRIEiSr's user avatar
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