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Questions about designing electronics for measuring, processing, and amplifying audio signals.

0
votes
1answer
I'm working on a simple audio circuit which takes two different signals from mp3 players (earphones output), mix them up and outputs to an amplifier/speaker. But before mixing the signals, I need to … measure the onset of Signal 1 with a microcontroller, in the case an Atmega328. I have little experience with audio and amplifiers so I don't know how to split Signal 1 from Signal 2 in order to read …
asked Oct 15 '17 by Chu
1
vote
1answer
I'm building a 6 channel circuit with the PAM8403 (Filterless 3W Class-D Stereo audio amplifier) and was wondering if I could make things more compact by using less components. Is it possible to …
asked Mar 26 by Chu
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votes
4answers
I've been trying to pan an audio signal between 2 speakers, in a way that I could program it to create an autopan effect. It seems an easy thing to do, but I have been struggling a lot with it and … and I could not make it work with an Arduino. After many tries I had to give up. Now I'm considering using a Teensy, but it seems to expensive for my project (teensy + audio board) and I don't know …
asked Mar 8 '17 by Chu
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0answers
I have been trying to use a digital pot to control the volume of an audio signal. I am aware that most digital pots don't take negative voltages and also that digital pots have a high wiper … digital pot (MCP4241 502) and the audio player (DF Player, a cheap mp3 module). There is a circuit for shifting the DC voltage up (VCC/2) so the digital pot will respond properly. Yet, I'm getting a lot …
asked Oct 29 '17 by Chu
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0answers
I'm a hobbyst trying to design a simple circuit for amplifying the PWM audio output of an ATTINY85. I'm using an LM4890 (1W amp) and a 1W microspeaker. The problem comes when I supply 3V with a small …
asked Mar 14 by Chu
3
votes
4answers
I'm working on a project in which LED lights synchronise with audio events. I'm not referring to reactive LED projects that read the ADC from audio amplitude or spectrum, but about having some … additional digital data playing along with the audio to indicate several triggers of events. Initially, the approach I'm taking is that of utilising a stereo file and having a channel for audio and another …
asked Apr 23 by Chu
0
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5answers
I'm trying to control audio level/gain (from line or amplified signal) using an Arduino. I do not want to use SPI, for this project I can only use the PWM outputs, thus I do not want to use a digital … pot. I found some related questions here, but they do not fully explain how this approach applies to audio applications. From the PWM I know I can use a low pass filter, but I want to save time and …
asked Jun 17 '16 by Chu
2
votes
3answers
I'm working on a circuit for a small audio device and I'm a bit confused about the headphone jack wiring, I hope someone can shed me some light. I'm using the LM4875 because I have a speaker and a … jack's symbol: I understand that P1 is connected to ground (sleeve), but in relation to P2 and P3 I'm not sure. I'm not familiar with the schematics for audio jacks. I imagine that P2 that is carrying …
asked Oct 8 '18 by Chu
1
vote
I found a simple solution filtering the interference noise by adding 2x 1000uF capacitors in parallel between the power lines near the receiver.
answered Dec 27 '17 by Chu
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1answer
I'm having a problem with a weird audible noise in my sound player circuit.. It's due to an interference with a LED strip. I've used this circuit (Arduino + DFplayer + Amplified Mini Speaker) many ti …
asked Feb 24 '17 by Chu
1
vote
1answer
. I realised then it should be an interference with the audio frequency. The player has a built-in 3W amplifier so probably frequencies are going through the power lines and mixing up with the RF. If … I power the audio player with a different power supply it works, but is there another way of avoiding this interference using the same power supply? Or maybe, would another type of RF module work …
asked Dec 26 '17 by Chu
0
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0answers
I've been trying to build a simple audio pot to be controlled with PWM with an arduino, but I'm not sure why it doesn't work. I could do it with a LED (not directly which is simple, but with a FET … ), but audio seems much more complicated. Here is the schematic so far... simulate this circuit – Schematic created using CircuitLab I probably need to connect something to the ground of the …
asked Jun 29 '16 by Chu