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Questions tagged [audio]

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

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0answers
62 views

Unusual DC offset with a simple resistor change? No DC source at all

simulate this circuit – Schematic created using CircuitLab In my circuit above, I have two circuits. The one on the left is the working tone control circuit but the one on the left is where ...
0
votes
1answer
28 views

How to properly use a shut pin in audio connector to prevent floating pins when disconnected

I'd like to use this RCA jack in a project that detects roughly the volume level on an RCA audio source. The circuit filters out the DC line voltage, amplifies it with a PNP transistor and then shifts ...
1
vote
1answer
36 views

CD4011 Oscillator Square Wave Output Fed to Transistor Audio Amplifier; Volume Control Question

I built an audio frequency square wave oscillator using 3 gates on a CD4011 quad NAND gate IC. I then fed the output of the oscillator (pin 11) to a very basic "push-pull" transistor amplifier on the ...
3
votes
1answer
129 views

Reverse engineering old record player schematic

So this is a loaded question I know, but I'm stuck and I don't know where to go from here... My mom has a super old record player. It's build into a bright orange suitcase which is pretty cool. We ...
1
vote
0answers
33 views

Why is my signal stronger in the positive than in the negative when i use 2n3819?

simulate this circuit – Schematic created using CircuitLab In the above circuit I have created a JFET amplifier for small signal purposes. When I run tests on the circuit, i get this weird ...
0
votes
1answer
63 views

Why would this Class D Audio Amplifier have low current draw?

Disclaimer: Saying I have very little knowledge of electrical engineering theory is an overstatement. I very much appreciate your help and patience. I'm not finding any questions similar to mine, but ...
0
votes
0answers
34 views

PTT works not as excpected [on hold]

I bought the following headset with a push to talk (PTT) button and four pin headset jack. If I connect this to my windows notebook the microphone is always on / working. But the curious thing is ...
4
votes
2answers
2k views

I found an audio circuit and I built it just fine, but I find it a bit too quiet. How do I amplify the output so that it is a bit louder?

I want to try something audio related and found the following circuit from technoblogy I built it and loaded a sound clip. Everything works fine, but I found it a bit too quiet and I want to amplify ...
0
votes
1answer
53 views

Artec QDD2 reverse voltage problem

I have an Artec QDD2 overdrive circuit and I recently powered it up with reverse voltage by accident and it doesn't give any sound on the stages of distortion, however it is allowing the bypass on ...
5
votes
2answers
321 views

Isolating an audio line connection with two capacitors

I've looked at several questions, such as: Isolating audio ground between devices I want to connect an input and output audio line signal of two different devices. The earth potential of their audio ...
0
votes
0answers
18 views

Mixing audio intercom with music to my earbuds

I'm flying allot and I'm trying to find a way to use my Bose QC20 earbuds during my flights with my aircraft so I can listen to both my music and the airplane Audio. I'm planning to make a microphone ...
0
votes
1answer
35 views

samsung galaxy phone jack pinout to pc

I'm trying to get the audio-out from a Samsung Galaxy A4 into a PC for recording with Audacity. I've tried a 3.5mm 4-pin (TRRS) and 3-pin (TRS) cable into the MIC input jack on the PC but none of them ...
2
votes
0answers
48 views

Audio PWM over Radio [closed]

I'm working on a project in which I must send audio over RF such that remote speakers can pick up the signal around a house/apartment. The goal is to broadcast music from a single device somewhere in ...
0
votes
0answers
19 views

Calculate Capacitor mf for PAM8402 Amp Powered From RPi

Trying to figure out what capacitor mf I should use for a 5v PAM8402 audio amp that is powered by a Raspberry Pi. When the amp is first turned on it triggers the Pi's low voltage warning. I'm using a ...
0
votes
0answers
31 views

LM4890 amplifier and CR1616, how to improve power consumption?

I'm a hobbyst trying to design a simple circuit for amplifying the PWM audio output of an ATTINY85. I'm using an LM4890 (1W amp) and a 1W microspeaker. The problem comes when I supply 3V with a small ...
0
votes
0answers
42 views

Effects of a voltage divider on an audio DAC

Background: I'm planning on using a TI TS5A22364 SPDT Switch with Negative Signaling to connect AGND to the Left and Right Channels of the TI PCM5102A Audio DAC when the DAC is powered down as an ...
0
votes
1answer
49 views

Repair lifted ground pad on power amp

I'm repairing a 250W bass power amp board and one of the problems is that the pads for two ground wires have lifted off the board. It looks like it has had something of a bodge repair done before and ...
0
votes
2answers
48 views

Converting a headphone output to line level

I have a guitar amp that has a headphone output. I would like to convert this signal to line level so I can use it in a small mixer along with other line level signals to be heard in "in ear" style ...
-1
votes
1answer
57 views

Audio amplifier using LM386L

I am a student and I am trying to build an audio amplifier. I wanted to ask if there's any way to replace capacitors with different (some in pF). If it could be possible, let me know. I'm using 9V ...
1
vote
1answer
75 views

How do I choose the power rating of resistors in audio power amplifier?

I read a bit about audio power amplifiers and struggle to understand the power rating of the emitter (i.e. current sharing) resistors in power amplifiers. I refer to this project. [EDIT: schematics ...
0
votes
1answer
57 views

OPA690 Stability

I'm having difficulties keeping this opamp from oscillating and heating up.The schematic is a slightly modified Mini3(mini cube )amp schematic with active ground. A 1nF cap across the 330 ohm ...
0
votes
2answers
54 views

Measuring Power across a dummy load - use voltage or current?

I have a high power 8Ω resistor dummy load (approximating a speaker) which is being driven from the output of an audio amplifier. I want to measure the power consumption and display the results on an ...
0
votes
3answers
56 views

Controlling the input detection on a 1/4" jack

So, I have a midi piano that outputs to it's speakers when there's no 1/4" jack in it's line out, and else only outputs to the line out. It's rather annoying having to constantly remove and replug the ...
2
votes
1answer
151 views

Analog Mute Circuit - Simplest Solution

I'm building a simple analog mute circuit and I need advice on the simplest way to achieve my goal. I have a GPIO pin that goes high when audio is playing and low when it's not. When audio is not ...
0
votes
0answers
35 views

Merging audio lines - one channel is quieter

I'm still learning digital electronics, and analogue electronics is very much a dark art for me. I have the circuit as shown below, the audio output stage for an 8-bit programmable sound generator. ...
1
vote
0answers
48 views

How to make a piezo speaker louder with 5V?

I have connected a tiny piezo pc speaker (https://sktechworks.ca/wp-content/uploads/2017/11/Speaker.jpg) to an arduino and used to tone command to play a simple melody in repeat (square wave only ...
1
vote
1answer
29 views

Noise canceling while recording from mobile on PC

I have a setup in which I have to control mobile Android device from the PC and record the outgoing sounds of it. The control is done by a USB cable. For audio recording I use a headphones which I ...
0
votes
3answers
54 views

Amplifier Speaker Question

I am trying to learn about audio electronics and built a simple single stage amplifier with a 2N3904 transistor. I play the guitar and know that when you plug an amp into a speaker it's impedance has ...
0
votes
0answers
28 views

Speaker crossover: can wrong ESR cause amplifier to clip?

I have an old pair of speaker I decided to revive. I recapped the crossover with new caps but now my amp keeps clipping when I turn the volume a little bit high (and it was not before). I wonder if ...
1
vote
4answers
66 views

How is electromagnetic interference possible when measuring voltage difference?

This question is primarily concerned with audio but it's probably applicable to other areas as well. As far as I understand, EMI is caused by electromagnetic waves adding power to wires as they ...
-5
votes
1answer
40 views

I need a conditioning circuit for audio signal for input of microcontroller 3Vdd power supply and voltage reference? [closed]

what is the Best circuit to amplify and condition a audio signal from a microphone to microcontroller analog input ?
0
votes
2answers
55 views

Can a Tri-State buffer be used with AC signals?

I'm trying to switch an analog audio line from its given channel to analog ground when a specific line goes low (in this case, the DACs charge pump goes low when it shuts down). Would a tri-state ...
0
votes
1answer
35 views

Ground Audio channels when mute

I'm using a PCM5102A DAC in a project and I've noticed that when the IC goes to sleep (>1 second without data on the I2S bus) there is some errant switching noise audible via the amp. If I connect ...
0
votes
1answer
51 views

Inject 5V bias power (“fake” phantom power) for microphone (ModMic)

I've recently bought a ModMic4 for my PC, but the signal level is very low and have to amplify it quiet a lot digitally, which introduces ton of white noise and I have to use noise supression which ...
0
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0answers
22 views

Can we do Karhunen-Loeve Transformation in one dimension matrix?

I have a one-dimensional matrix (that was extracted from the audio data) to process so the noise of the data could be eliminated. A paper told me that I have to use the Karhunen-Loeve Transformation (...
0
votes
0answers
23 views

Tda2822 audio amplifier used for mono signal

I have a signal from an astable connected to 9V which I want to amplify using the TBA2822 amp. The speaker I want to amplify the signal for is 8 ohms impedance and 2 W power. Since the signal I have ...
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0answers
71 views

I want to amplify my phone headphone output signal to drive a 2watt 4 ohm speaker at its highest performance

I want to amplify my phone headphone output signal to drive a 2watt 4 ohm speaker at its highest performance. Does anyone know standard TRS output signal characteristics ( source impedence and ...
2
votes
2answers
97 views

Cause of background buzz in my walkie talkie example? [closed]

I got a simple RF24Audio walkie talkie example working. I'm using the sketch file provided by the RF24Audio getting started example: https://github.com/nRF24/RF24Audio/blob/master/examples/...
0
votes
0answers
74 views

What is wrong with this single supply opamp circuit for audio?

I am currently building an output stage for a DAC with opamps, in single supply configuration. Here is my circuit from LTspice: I have exactly built this on PCB, so I am talking about the real thing ...
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votes
0answers
46 views

What causes guitar amp to crackle and pop when connecting a smartphone to it?

I shortened a TRS aux cable (by cutting/soldering/heat-shrinking both ends of the cable). When I connect my laptop to my guitar amp (Peavey Vypyr 2) using this cable, it sounds good. But when I ...
0
votes
3answers
77 views

Amplify an Electret Microphone using an input Jack 3.5mm

First time on the platform, I will try to be as clear as possible, and electronics is a hobby for me, so I'm open to any welcommed criticism. I'm trying to build a little project, recording the sound ...
1
vote
2answers
129 views

Reducing noise in this audio amplifier

Here is a picture of a circuit I built. I'm a novice in building amplifiers, but I'm interested in building a simple circuit that picks up music using a condenser microphone and transmits it across ...
0
votes
1answer
128 views

Sound distorted from amp configuration, and one transistor variety getting too hot

The sound is distorted from my configuration. The transistor I'm using is an MPF4393. I need to add resistors and capacitors and how do I get more power (to make it louder) What should I add? Also ...
2
votes
0answers
66 views

High SNR FM demodulation

So I need to demodulate the FM signal from a sensor with highest SNR possible, at least 70-75 dB. IF is 10.7 MHz, max. deviation is 200 kHz but I can change those values if needed. Baseband signal ...
2
votes
0answers
38 views

How to connect a MEMS Microphone Breakout - INMP401 to a RN-52 bluetooth module?

I intended to use a INMP401 (MEMS MIC) to capture audio and stream it via bluetooth using an RN-52 bluetooth module (RN-52). The RN-52 has inputs for differential +- signals. The INMP outputs ...
-1
votes
1answer
40 views

Bose QC 25 Headphone Cable Type

I am trying to repair my set of Bose QC25s and I need to buy more cable in order to do so. I am not sure which type I need specifically. The cable looks like this: It appears to have 4 conductors, 3 ...
0
votes
0answers
50 views

iPhone headphone out as a signal source for AM modulation circuit

EDIT: I wonder what is the appropriate model for an iPhone/MP3 player audio out? I imagined it as a voltage source that would support whatever current the resistance it’s connected to necessitates. Is ...
1
vote
1answer
34 views

Induction loop resistance calculation

I have been trying to build a simple induction loop amplifier. I am using TDA2040 as an output stage and it delivers 10 W (I limited it for that). I am using about 14 meters (1 mm thickness) loop. My ...
0
votes
1answer
72 views

speaker problem with high volume

I am trying to build an audio system . I have a speaker which is rated 10 W and 8 Ohms . I am using a circuit from datasheet of TDA2040 with a pre-amplifier circuit with the microphone . when I ...
0
votes
2answers
83 views

How can I make a phase shift in an audio signal without changing the frequency response too much?

I have the following problem: I have two amplifiers, one is a mono amp for a subwoofer and the other is a stereo amp for two two-way speaker enclosures. The subwoofer and two-way enclosures have a ...