Questions tagged [audio]
Questions about designing electronics for measuring, processing, and amplifying audio signals.
3,281
questions
1
vote
2
answers
86
views
Disabling microphone when secondary one is connected
I'd like to add a 3.5 mm female jack to this circuit so that I can add a better external microphone while keeping the internal one for convenience. What would the circuit look like?
Putting both ...
- 11
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
0
answers
73
views
Automatically Vary LFO Speed Resistance Value
I have a basic tone generator circuit with LFO speed controlled by a 50K pot (variable resistor). I would like this resistance to fall (or rise, but I guess fall might be easier) after the circuit has ...
- 1
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 ...
1
vote
1
answer
103
views
TRS headphone jack wiring
Summary:
I have an in-ear-headphone that I am trying to replace the TRS jack for. I have tried soldering the wires to a jack a couple of times with the same no-good result. The left speaker doesn't ...
- 13
0
votes
1
answer
93
views
How to make an active crossover Opamp filter an audio signal
Background
I've built a few passive crossovers, but never done anything active and my electrical skills are newb at best.
I wanted to test out an active crossover after reading into by-amping a stereo ...
- 101
1
vote
1
answer
56
views
Wiring two TRS sockets to accept either one TRS cable or two TS cables inserted
I am looking to modify the input of a small stereo amplifier with a TRS input jack to have two TRS input jacks instead.
I want it to handle the following two scenarios.
Scenario 1.
Two TS plugs are ...
- 11
0
votes
3
answers
84
views
Polarized capacitor type identification
I need to know what is the type of this capacitor. Never seen these before. It is polarized (red side is +) and rated 4MFD (4uF I would guess) 25v. I also would like to know what would be an ...
- 13
1
vote
2
answers
121
views
RC or RL high pass audio filter?
Some bass guitars from the 60s, namely Gibson and Guild, used RL, LC, or RLC high pass filters to reduce bass frequencies if desired. The control for these switches was commonly referred to as the &...
- 13
0
votes
0
answers
35
views
Possible noise from tps63020(buck converter) that is affecting audio MAX98357
I'm pretty new to the engineering but I hope this will be an easy question for those who have done much job in this area.
So I'm making my own pcb that consists mainly of esp32-s3, 2x tps63020 (3.3 ...
- 101
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
2
answers
99
views
Driving speaker with differential driver
I am designing an battery powered device (3.6-4.1 V regulated down to 3 V) which plays audio recordings through a speaker (8 Ω, 0.3 W). I want to drive the speaker by applying two differential inputs, ...
- 135
0
votes
0
answers
30
views
Interference in AUX connection when source is off
I have a cheap-o bluetooth speaker with an aux input that I have connected to the headphone output of my monitor. It works, but when the monitor is off there is a hum coming from the speaker that I ...
- 189