On the 3-rail forum, there is a topic running, about using MP3’s, in conjunction with (model)railroads …
I found some cheap MP3 modules on Ebay, a complete MP3-player, for less then 2 Euro ! It comes with an internal battery, audio jack output, and microSD slot (max. 8 GB) I already did dismantle a lot of these units 🙂 It’s simple:

Take a look at my home automation electronics, there is already a board named “MP3 light controller”, I used that board to control those little MP3 players. It should give you a good indication on how to wire-up those things 🙂

 

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