Questions tagged [audio]
Questions about designing electronics for measuring, processing, and amplifying audio signals.
3,271
questions
8
votes
7
answers
2k
views
What is the reason for using decibels to measure sound?
If the decibel represents a gain ratio, why do we use it in sound measurements?
Yes, since we have an input signal in audio amplifier circuits, we can understand the behavior of this system according ...
- 377
0
votes
2
answers
26
views
Measuring voltage from the aux cable signal
I wanted to make a bjt amplifier circuit to get used to analog circuit design. My plan was to use an AUX cable connected to my phone. I cut the cable and stripped the 3 wires inside. I wanted to see ...
- 377
2
votes
2
answers
92
views
What is the function of the inductor in this Bluetooth audio module?
I found the circuit below for a Bluetooth sudio module that included a 100 mH inductor in series and then a 10 uF capacitor in parallel to the power input.
Image source: Iranian electronics seller ...
- 43
0
votes
0
answers
64
views
Looking for feedback on audio schematic
I'm making an mp3 player and I'm looking for feedback on the audio side. It takes an i2s input from an esp32(not in this sheet), and outputs to a headphone jack. This is my first audio project (...
- 11
0
votes
0
answers
20
views
Audio project converting TSH-4 headset to 3.5 mm audio jack
I've been trying to connect this TSH4 headset to a 3.5 mm audio jack. The headset has kind of a weird setup, with Mono audio + and - being the top pins (I don't know which is which, but the polarity ...
1
vote
0
answers
65
views
Making audio signals imitate USB flash drives [closed]
If there is a USB port designed for USB flash drives that plays the audio files in that drive when it is connected --such as the ones commonly found in cars-- is there any practical way to turn an ...
- 43
0
votes
1
answer
105
views
Modifying TI schematic to learn more about amplifiers
Let me start off by saying that I'm a complete beginner. I've watched some videos on amplifiers and read about them but it's hard for me to analyze circuits that don't match exactly to the examples I ...
- 1
4
votes
3
answers
473
views
Audio engineering: amplifying two different sources
I've started a small project to renovate/rebuild an old record player for my wife. I have a degree in Electrical Engineering, but it's been almost 15 years since I last had to project/build a circuit, ...
1
vote
0
answers
78
views
Can an audio isolation transformer between a preamplifier and an amplifier cause the amplifier's fuse to blow? [closed]
I'm building a microphone preamplifier. I was having problems with hum (intermittent ground hum when touching the case) and decided to try adding an audio isolation transformer (600 ohm : 600 ohm) ...
- 111
1
vote
2
answers
58
views
Inline volume control for analog audio signals with push buttons [closed]
I want to build something to control the amplitude of analog audio signals between the source (line level analog audio output already extracted and decoded from an HDMI source) and the AMPs. In ...
- 21
1
vote
0
answers
62
views
PCB digital sound input and output
I've designed a simple 3-band equalizer circuit. I've used 3.5 mm audio input connected with computer via 3.5 mm audio jack for input, and basic small speaker for output.
In all my references, many ...
- 31
7
votes
3
answers
509
views
Audio amplifier for school project
For a school project, we have to explain this design of a audio amplifier. We have only been able to understand to parts marked with colored rectangles.
The design comes from the book audio power ...
- 79
1
vote
1
answer
35
views
Identify and substitute f1404zs
I need help understanding which chip I need to buy.
First, I hope this is the correct community; if not, I apologize.
My intention is to repair a Mark Levinson 86280-0w690 audio amplifier, inside ...
- 113
1
vote
0
answers
65
views
How to generate a 50-100 Hz 12 Vac sine wave for audio tone from 5 VDC (PB0 pin) atmega164p microcontroller [closed]
I have programmed to ATmega 164P to make PBO high when PC1 is low. In programming, I'm adding other peripherals as well.
But I am facing one issue regarding generating a tone. I have drawn low pass ...
- 11
0
votes
1
answer
45
views
How to replace microjack on stereo earplugs with microphone [closed]
I broke a microjack connector. It is attached to a set of stereo earplugs with built in microphone. I know how to solder, but I am not sure how to find the correct replacement plug and how to identify ...
- 103