Questions tagged [audio]

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

Filter by
Sorted by
Tagged with
1
vote
1answer
31 views

Hooking an Electret Mic to an ESP32 via MCP3424

I have the need to use an electret microphone to sense noise level spikes for the purposes of impact detection. My circuit consists of an ESP32 communicating with an MCP3424 via i2c. The electret is ...
0
votes
0answers
27 views

How to separate the modulated signal on a DC supply into signal and power

I a have an AC audio signal modulated on a DC power rail. The AC signal is around 0.7 V pk-pk. The DC power supply is 30 V @ 2 A max. With the power supply, I supply 10 units, each drawing 100..200 mA....
0
votes
0answers
49 views

Car cassette audio power amplifier IC suddenly overheats

My car's cassette was working just fine for many years. All of a sudden it started behaving weirdly. I was using a cassette-aux adapter to play music with my phone. It looks like this: All of a ...
2
votes
3answers
431 views

Is it good practice to use diodes in a stereo to mono conversion?

Some background: I am making a VU meter with LED strips using the Alexa Gen 4 Echo as the sound source. I'm planning to modify the Alexa so that I solder external wires to the left tweeter, right ...
1
vote
1answer
87 views

How to connect one Android mobile audio output to mic of another Android mobile?

This question is to help the "Hard of hearing community" so that they can READ the phone/mobile call because they can not hear it. Android have some really good(and Free too) app which can ...
0
votes
0answers
39 views

Identifying and finding a replacement audio signal transformer 50 ohm / 0.5 ohm

I am trying to identify and find a replacement for the attached transformer. The green/white leads with the red center tap have a 50 ohm resistance. The side without the center tap has a 0.5 ohm ...
1
vote
0answers
39 views

opamp single supply output AC (audio) voltage limit

I build non-inverting op amp with single supply voltage cca 9V. The basic scheme is shown in the figure below: How to limit output AC signal if the base DC voltage is at half the supply voltage 4.5 V ...
0
votes
0answers
15 views

Connection of TRRS microphone not TRRS headset

I know for headset T- Left R- Right R- mic S- Ground But for only microphone T - unknown ? R - unknown ? R - mic S - Ground What are those unknown? I want to plug it to my computer which has separate ...
1
vote
2answers
75 views

10W speaker with LM386?

I have a simple question. I'm making an audio amplifier using the circuit given in the LM386 datasheet. According to the sheet, my IC can supply max 1W of output power and recommend load is 4 ohm. The ...
1
vote
1answer
22 views

Meaning of N parameter in Chan Model LTspice

I'm trying to model an audio transformer for core saturation simulation but I don't understand what N parameter represents in the Chan model. It should be the number of turns of the windings but if I ...
0
votes
2answers
51 views

STM32F446 & External Oscillator

I am currently building an audio guitar pedal. I was suggested to use an external clock as reference for my CODEC and MCU. I've been reading the "Oscillator design guide for STM8AF/AL/S, STM32 ...
0
votes
0answers
39 views

Replacement capacitors for Celestion DL6 crossover

I have a couple of Celestion DL6 speakers that are more than 30 years old. Not quite as good as they used to be, it seems. I assume the electroytics deteriorate? In which case I need to replace them. ...
4
votes
3answers
265 views

Where is my audio noise coming from?

I am using a Raspberry Pi 3B to output music to an audio amplifier board. Without the Pi connected, there is no noise from the amplifier. Once the Pi is connected (but not outputing any music yet), ...
0
votes
0answers
34 views

What kind of two-pin connector is just a little smaller than jack 3.5?

I found an old DIY amplifier that I would like to use, but I ran into a problem: I don't know what kind of connector it has. I know for sure that this device is an amplifier, since I once used it and ...
0
votes
0answers
45 views

Playback volume from old Sony voice micro cassette recorder is very low

I have an old Sony V.O.R M-529V microcassette recorder. It was found in a box packed away years ago. I put in some fresh batteries and tried to play some old micro cassettes I had, but the play back ...
1
vote
1answer
77 views

Differential pair with current mirror - unequal currents

I designed a basic audio amp for learning purposes and now I'm trying to upgrade the differential stage with current mirror. However, I encountering a problem - the currents on both branches of the ...
1
vote
2answers
48 views

Not visualizing signal in oscilloscope when a speaker is connected

Hope you can help me with this, because I really don't understand what is happening. I have the following electronic circuit. The Arduino is generating a tone and I am changing the volume with a ...
2
votes
1answer
43 views

Bluetooth receiver board into 60's console stereo Tape In

I'm looking for a bluetooth receiver board to connect to the Tape In of my 60s stereo record player console. We've used our Android phones with a 1/8" to RCA Y cable into the Tape In, and it ...
-1
votes
1answer
46 views

Transmiting analog signal with lora

I want to transmit an analog signal over Frequency Modulation with a Lora RA 02 module. First thing I need to do is convert the analog signal from the audio source to digital, right?. But I had so ...
0
votes
2answers
47 views

Volume Control - Logarithmic Potentiometer Placement

Thanks in advance! I am building an headphone amplifier with PCM1794A, OPA1612, and OPA1622. Where would be the best placement of the logarithmic potentiometer for volume control without decreasing ...
1
vote
2answers
58 views

Re-capping old car stereo - does this affect bias?

I am refurbing a car stereo from an early-90s Volvo (stereo model HD-603) - plus replacing the cassette circuit with Bluetooth and Aux In. But this question is not about this modding per se. The ...
0
votes
2answers
39 views

Mini USB Male to 3.5mm female tips?

I got some helmet speakers for free from my work. I was hoping to just install them and them plug in a 3.5mm connection to my phone and play away. But the speakers have a mini usb since you "need&...
0
votes
2answers
60 views

Speaker Line Supervision

I want to design a circuit for 100V loudspeaker line control. I want to periodically check if the line is short circuit or open circuit and receive notifications in case of any short/open circuit. I'...
3
votes
1answer
201 views

How does this telephone circuit eliminate the sidetone?

I know that the sidetone in telephones is removed by a hybrid transformer or by differential amplifier using an op-amp. I don't know how this circuit does the job using just 2 transistors (I took the ...
0
votes
0answers
37 views

Basic shielding practice for simple passive audio project in an enclosure?

I'm a tinkerer but not an electrical engineer. I'm constructing a stereo->mono summing box for my stereo (to listen to Beatles LPs properly, natch). I'm using the design & schematic here for ...
0
votes
2answers
96 views

Possible causes for sore ear when using audio amplifier (PAM8302A) and speaker at a reasonable volume

I've been working with a PAM8302A analog audio amplifier from Adafruit and added a second order low pass filter (2 x 470Ohm resistors and 2 x 2.2uF capacitors) to get rid of some of the audio feedback ...
-1
votes
1answer
59 views

Need help with low power audio amplifier circuit [closed]

I intend to output an 8-bit waveform generated on an ATtiny1614 microcontroller running at 3.3 V to a 1-2 W, 4-8 ohm speaker and have the user able to change the volume. For that, I am thinking about ...
-2
votes
1answer
58 views

12v ac supply to 12v dc load

Hi guys need advice I have a vintage Amp and the db meters lights gone out the supply voltage is ac and I can only source 12v dc leds how do I convert 12acsupply to 12dc load
1
vote
1answer
47 views

Driving parallel MOSFETs (IRF540) with IRS2092

The IRS2092 datasheet shows a 4 ohm load circuit (see image below). I want to check whether MOSFETs can be paralleled to support low impedance of 2 ohms, instead of 4 ohms as shown. Can anyone please ...
1
vote
1answer
47 views

Replacement capacitor type for microphonic ceramic cap

I have a guitar effects pedal that has become microphonic, meaning if you tap the enclosure the sound can be heard in the amplifier. I've traced the issue to a single ceramic capacitor on the board. ...
3
votes
3answers
261 views

How should I probe when measuring output impedance? Why do I get inconsistent readings?

I am trying to measure the output impedance of a commercial headphone amplifier, but the results seem to change depending on how I probe it. When I plug a 1m cable into the device and the other end ...
3
votes
2answers
245 views

Feedback in multistage amplifier

I found this schematic online for an audio amplifier and I noticed the 100k was some sort of feedback system between the base of the first stage and the emitter of the next. How would you describe ...
0
votes
1answer
44 views

Inputs to TDA7498E Audio Amplifier

I am planning to use TDA7498E in one of my projects and was going through the datasheet of the same and got confused at one point. In the absolute maximum ratings, it is written that the INPA, INNA, ...
4
votes
2answers
635 views

Why do differential signals need an inverse wave?

At the moment, I'm working on converting a single ended audio signal to a differential one (source is a CS42L55, need a differential input for a CSR8670. The latter's datasheet is indecisive about how ...
1
vote
3answers
65 views

Amplification in multistage amplifiers

I'm building a double stage Common Emitter preamp and I'm wondering about the order of amplification. I want a voltage gain of 30 coming out of the second stage; would it matter if I had x10 in the ...
-6
votes
2answers
51 views

Computer Speakers vs. Human Voice [closed]

How do computer speakers compare to the human voice in regards to the range of frequencies they can produce? What is the lowest a human voice can go (either world record or just the average person) ...
0
votes
0answers
25 views

Dependence of the PWM amplitude of the amplifier on the battery voltage

I'm going to use speaker connected to internal Class D amplifier in WM8998 in my PCB. Power source of my PCB is Li-Pol battery with 3.2-4.1V range or external 4V adapter. Audio codec speaker power ...
1
vote
1answer
57 views

How to change from audio-out to MIDI out from same headphone jack?

I am trying to add MIDI OUT capabilities to an audio device - using the same jack. User will select in software if audio or midi is to be outputted. Currently, the audio jack wiring is as shown (R1 ...
0
votes
1answer
57 views

What would be the best, cheapest, smallest way to power a Bluetooth bone conduction headset project?

Please, be forewarned, I'm an idiot when it comes to electronic builds. The last thing I soldered was a pick-up in a guitar kit I built, and the thing still isn't grounded right. I'm trying to build a ...
0
votes
1answer
33 views

A few questions regarding the functionality of this negative peak audio detector

I have some queries regarding this peak detector from an audio compressor circuit: My understanding of the process is that when the positive input swings low, D5 is negatively biased and stops ...
0
votes
0answers
50 views

Radio - Amplifier Connection

This is my first post here, so please give me feedback on how I can improve in the future. Background I am trying to reverse engineer a Becker Grand Prix Stereo Radio with an external amplifier. On ...
0
votes
0answers
37 views

What does resistor value change in a passive audio sum circuit?

I'm looking to build a passive audio sum box to connect two mixer headphone outputs (with output impedances of 10 Ω and unknown) to a single pair of headphones for music performance. I plan to use my ...
0
votes
1answer
42 views

Automatic Audio Source Switching

I was unable to find an answer to this question, but feel free to link any additional threads I may have missed. In my car, I have an aftermarket amp, and multiple HAM and public service radios. I ...
0
votes
1answer
61 views

Can replacing a capacitor with a different brand cause audio channel imbalance?

I recently broke a "Nichicon 100µF 10v Fine Gold High-Grade Audio Capacitor" off my motherboard's audio circuity and replaced it with a generic 100µF 50v capacitor I found at a local ...
0
votes
1answer
71 views

Can I use a bench power supply as a substitute for a 9V DC adapter?

I want to test a guitar pedal but I don’t have a 9V adapter around - but I do have access to a DC power supply. Is it possible* to alligator clip the +ve to the power terminal and ground to the ...
2
votes
3answers
616 views

What is this kind of audio cable called?

I broke my headphone cable. It is exactly like the one in the image but I don't know how to search for this kind of audio cable (I only find cables with at least one receiving end). Does anyone know ...
0
votes
1answer
78 views

Powering an ESP32-DevKit with 3 AA batteries

for my project i have to put quite some stress on my ESP32-devkit in addition to it needing to be a mobile device. I need to power the esp32, an SD-card reader, an LCD-display, two I2S-MEMS-mics and ...
0
votes
3answers
51 views

Analog linear interpolation of AC signals

I have two AC signals in audio range \$V_1\$ and \$V_2\$, both around \$2\,\mathrm{V}\$ p.p.. I need to interpolate between the two linearly through some external control voltage \$V_c\$ (ideally also ...
0
votes
1answer
46 views

Problem with ADC in AVR XMEGA

I am using an Xmega32A4U I convert an audio with ADC and after processing it sends out with DAC. I checked Power supply and try all of parameter to use ADC but it is a big problem and the audio out ...
1
vote
2answers
131 views

Capacitive voltage divider frequency response and cut-off frequency

I'm working on designing a guitar pedal based on the topology of an old tube amplifier I own. Between the amplification stages I found an inter-stage filter that I cannot understand in the frequency ...

1
2 3 4 5
53