Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Arduino controlled mp3 player with PAM8403 amplifier board - Noise problems

Status
Not open for further replies.

Jables

Newbie level 1
Joined
Jan 25, 2017
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
45
Hello Forum,

I am new here and hope that you can help me with my problem.
I researched for a solution to my problem and stumbled across this thread:
https://www.edaboard.com/threads/336882/

The user described a problem very similar to mine, but unfortunately the thread was never continued and I couldn't find out if the proposed solutions worked.
Since I am an absolute beginner to electronics and had some trouble understanding what the source of the problem was and how to solve it I started this thread to hopefully find a solution and I understand an that is working.

To my project:
I have an Arduino Uno board and connected to it is a regular button, 2 ir sensor module and a DFPlayer Mini Mp3 player board. A PAM8403 amplifier board is connected to the mp3 player and eventually to a speaker. The test setup is done on a breadboard.

(The final version will include a seperate amp for each output of the mp3 player and 3 speakers but lets start with one)

The button and ir sensors work as switches that control the song that is being played by the mp3 player. I used IR sensors in order not to have a physical button.

All modules run on the same GND. If I run the board without the amplifier everything works perfectly, no noise.
If I add the amplifier I have several types of noise.
First is a general noise like a constant "hissing" sound.
Second is a loud constant noise once the board is done initialising.
Third is a noise that is caused once I press the button (interestingly NOT if I activate the IR sensors)

If I run the amplifier on a different power source the second noise disappears but the first and third remains.
Therefore I assume that it has something to do with the signal connection from the mp3 player to the amp.
The power I am using is a usb power bank.

Eventually I am searching for a solution that eradicates all noise and runs on a single power supply.
Since I don't know how to draw schematics I added links to all the parts I am using and hope that it is understandable.
I connected the MP3 Player to the arduino in the way shown in this tutorial:
https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Tutorial

IR Sensor
**broken link removed**
Button
**broken link removed**
MP3 Player
https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299

Thanks a lot in advance for your help. If any questions remain I will try my best to answer them all.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top