Questions tagged [audio]
Questions about designing electronics for measuring, processing, and amplifying audio signals.
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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 ...
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ADC distortion when writing to microSD
I am doing my own project making a basic audio recording device using microcontroller's ADC to get the audio signal from electret microphone and saving data to microSD card. I'm using STM32L476RG ...
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Coupling/decoupling power supplies: how? [closed]
I'm adding a hi-Z adapter to a solid-state amplifier that is powered from the mains through a transformer and regulator. The hi-Z adapter is powered by 24 volts DC, so i need an external power supply ...
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Analog signal input from device with different ground reference
I am somewhat new to the world of electronics, but am now trying to design my first more complex PCB. I am trying to make a set of battery powered earphones that take an input from a 3.5mm audio jack ...
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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 ...
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HDMI output from FPGA
I've got an old project that produces NTSC video output from an FPGA using a resistor ladder DAC. It also produces a stereo audio signal using a similar RL DAC.
I'd like to bring it into the modern ...
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How can I record with this old fashioned mono microphone? [closed]
I have this microphone that comes with a 3.5mm mono jack connector.
When I plug it in to my laptop or my phone it won't work, and I believe the "mono" part is the problem. What do I need to ...
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Debugging a SA 90.4 800W class-D audio amplifier
I am using a Re-audio SA 90.4 800W 4-channel class D audio amplifier (https://www.amazon.com/REAudio-SA90-4-4-Channel-Digital-Amplifier/dp/B00RE9EO7K) for some underwater piezoacoustics experiment. ...
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How do you choose an audio isolation transformer for a microphone?
I found a few SE Q/A's for audio transformer characterization, but they neither address calculating the impedance match, nor consider signal loss for weak audio sources (like those from a microphone).
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Audio Amplifier Transistor with Diodes
I'm trying to understand this audio amplifier.
Whats the purpose of these transistors with the diodes in series?
The circuit i'm trying to understand is from the NAD-S300
https://audiophillness.com/wp-...
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Do audio impedance mismatches cause reflection (ie, 8-Ohm output to 20kOhm input) ? Does it matter?
I understand that audio source⇒input impedance mismatches are normal, and this answer provides a good reason as to why. However, having worked with RF more than audio, mismatches cause reflection that ...
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In an audio mixer, when is it necessary to match the input impedance of other devices?
I found an audio mixer design that introduces a 47k resistor on each input.
Credit: Graham Lambert
According to the designer:
We want the input impedance presented to each input to be constant and ...
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Why does 9.7Vrms == 27 Vpp? I thought it was 9.7/0.707 == 13.72!
At first, I thought this calculator was wrong, because I have always used an RMS to peak-to-peak conversion as \$ V_{RMS} = \frac{V_{pp}\sqrt{2}}{2}\$:
https://benchmarkmedia.com/blogs/calculators/...
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TWO 3.5mm AUX sockets to ONE 3.5 AUX plug - Car Audio Application
I am putting together a car audio system and replacing the factory stereo with a new aftermarket head unit that has a single aux input. The vehicle comes with a single OEM aux input jack in the dash. ...
CommunityBot
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What type of cap would you use to block DC on a microphone-level audio line (unbalanced)?
I need to block a DC voltage on a microphone line, and a bit of research shows that MLCC is a bad idea because they can mechanically ring from vibration.
Question:
What type(s) of capacitor could be ...
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