All Questions
Tagged with audio operational-amplifier
347
questions
-2
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0
answers
60
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Audio amplifier for a physics experiment, how do I make it? [closed]
The experiment includes a mic taking in sound(2KHz-4KHz) and sending it to a DSO. I need an audio amplifier circuit in between that to amplify the signal so it would be visible properly. The ...
0
votes
1
answer
45
views
Audio Codec Input/Output Channel Stages
I am planning to build a PCB for a Eurorack Modular Synthesizer, incorporating an STM32 for DSP and a bidirectional Audio Codec like the TLV320AIC3104 to handle the ADC/DAC.
Eurorack audio signals ...
- 1
0
votes
2
answers
86
views
What is the maximum dBu I can send into a microphone input in this schematic?
The schematic below is from the Icom 9700 radio service manual (page 80). I would like to feed this input from a mixer board's ALT-3/4 outputs, and I want to avoid blowing the TS462 microphone preamp ...
- 2,088
-1
votes
2
answers
65
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Boost or buck audio input to minimum and maximum levels
Similar to Simple circuit to boost line-level audio
Background:
Some songs start out really quiet - Queen is notorious for this - and then eventually ramp up to passable audio levels. To hear them, ...
- 1
0
votes
5
answers
97
views
How does one add a volume control to this circuit?
My uneducated guess is to add a potentiometer at R6. Can anyone confirm?
Image courtesy : amplifiercircuit.net
1
vote
1
answer
88
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Audio visualizer: What can I improve in this circuit?
Being a beginner in electronics, I embarked on designing and building a sound visualizer, turning bass, mid, and high frequencies into red, green, and blue light in an RGB LED strip.
I designed the ...
- 169
0
votes
0
answers
69
views
Noise in audio amplifiers when touching the smartphone touchscreen as an audio source
While observing the audio output of my smartphone on the oscilloscope, I noticed a signal being generated when I touch the touchscreen. This signal is around 500Hz and appears in groups of 3 peaks, ...
- 53
0
votes
1
answer
94
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
0
votes
2
answers
99
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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
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 ...
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
2
votes
0
answers
88
views
Advice on active line-level audio mixer using a single supply rail
A few years ago a asked a question about an active audio (line level) mixer I wanted to make. I got some advice about how to run it off a single supply to make things easier and I was hoping to come ...
- 77
6
votes
5
answers
1k
views
Mixing audio signals: pros and cons of using resistors instead of an op-amp
I'm working on a project that requires me to mix two audio signals from two sources (both on the same PCB).
Source one is an audio output coming from the the VS1053B MP3 Audio CODEC IC, and source two ...
- 1,195
0
votes
0
answers
48
views
Audio signal likely spectral distribution (What op-amp slew rate for audio - in practice?)
If I'm processing an audio signal (assumed 20 Hz - 20 kHz) in an op-amp circuit and I need to select the slew rate, the simple and obvious, yet conservative answer is \$SR \geq 2\pi f V_{\text{peak}}\$...
- 2,181
4
votes
2
answers
267
views
Amplitude inversion circuit
I am a beginner in electric circuit building and I am trying to build a specific circuit aimed for audio transformation (guitar efx pedal, euro rack etc). I have built a number of implementations of ...
- 41