I'm new to elctrical engineering and want to do a diy project so yeah(plz help)

 

The internet is a good place to start. If you ask the same question about MP3 players on any search engine, you will get all the information you need. To find out how a headphone jack works, I suggest that you get one, with the matching plug, and first make some continuity measurements and then pull it apart.

 

The internet is a good place to start. If you ask the same question about MP3 players on any search engine, you will get all the information you need. To find out how a headphone jack works, I suggest that you get one, with the matching plug, and first make some continuity measurements and then pull it apart.

Indeed you will find a lot on line, at least 4000 hits wanting to sell you something, and a very few offering useful information.

 

https://www.explainthatstuff.com/how-mp3players-work.html
https://www.explainthatstuff.com/headphones.html

 

hi what,
This is one option in building a MP3 player.
E
https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299

 

MP3 was/is a way of compressing audio files for use in small hand held devices Pods etc.

 

https://lame.sourceforge.io/links.php

 

The operation is that it sequentially reads and decodes the sound files. The decode process include includes de-compressing the files. There is a fair amount of magic used in the process, which is difficult to explain.The data string is then sent to a FAST D/A converter and from there to an audio amplifier.