All Questions
712
questions
0
votes
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answers
66
views
Looking for feedback on audio schematic [closed]
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
1
answer
107
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
477
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
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
76
views
Mains hum in TDA7265-based active loudspeaker
The old pair of M-Audio Studiophile AV40 active speakers (one box containing all the amplifier parts and the second is just a passive box) I have have developed a clear low-frequency hum. This hum is ...
- 1
0
votes
0
answers
75
views
PAM8403 weird clicking / banging noise
I'm using an ESP32, a PCM5102, and a PAM8403 to output a 3.5mm Audio Jack output.
In my circuit, I'm sending the Audio Signal via I2S to the PCM5102, where a quieter output can be picked up. If the ...
- 1
0
votes
1
answer
78
views
TRS headphone output socket that may be used with a TS mono jack: how to prevent short to ground?
I'm using a TPA6132 headphone amplifier connected to a stereo (TRS) output socket. In my application, the output will usually be used as a line output, and only occasionally with headphones. The audio ...
0
votes
2
answers
107
views
Help with identifying a problem with an electrect microphone amplifier circuit
I have been trying to make a USB microphone from a JLI-2555BXZ3-GP microphone capsule. This is my specific pre-amp design where V1 represents the electrect microphone. The JLI doesn't have an internal ...
- 3
0
votes
1
answer
41
views
Can I connect two speakers to a mono analog input Class-D audio amplifier
I am using LM4670SD/NOPB in my design. The chip supply voltage is 5 V. My question can I connect two speakers to this amplifier as shown below. If yes what are the things to be taken care.
- 2,593
0
votes
1
answer
154
views
Power supply auto cut-off required when there is no audio signal
This is an add-on amplifier and speakers I've installed in the hourly chiming cuckoo clock and attached clock speaker output as an input source to PAM8403.
Source: Circuits DIY - Simple PAM8403 Audio ...
2
votes
5
answers
154
views
Stages of audio amplification from mV to 20V+
I have been trying to learn how to amplify audio signals from very small signals (20mV) to large signals (20V+) while using only transistors. I have figured out how to build a class A common emitter ...
- 315
0
votes
1
answer
62
views
Options for line output doubling as headphone output
As the title says, I'd like a combined line/headphone audio output with the following design criteria:
ideally driven from 5V single supply (12V available, but noisy)
flat frequency response, also in ...
1
vote
2
answers
35
views
Why does the volume of the preamplifier change when a second audio signal is mixed? [duplicate]
I have two audio signals leading to the amplifier input: the first one comes from the preamplifier, the second one from the audio output of a smartphone/tablet device. Both have a resistor and a ...
- 53
3
votes
1
answer
182
views
Why use of asymmetric power supply in Op Amps for this audio device?
I am learning about op amps and audio devices, and decided to run a simulation of the following device:
https://www.electrosmash.com/klon-centaur-analysis
I started humble, and run the simulation in ...
- 31
0
votes
2
answers
95
views
Class-AB Power Amplifier not working in LTSpice
So we were asked to create an audio amplifier simulation in LTSpice. We decided that the total gain of the circuit should be around 600, having four stages in total: differential amplifier, CE ...
