Von Rodrigo Shiordia López an alle: 03:27 PM a few years ago i made a DIY box amplifier. similar to this one. they are not that difficult to make http://runoffgroove.com/littlegem.html
Those who are interested in neo pixels can watch this video from YOUTUBE , this girl show something interesting use of Neopixel is https://youtu.be/EvRxQbhDxCo
30 second video of students doing this in out Fab Lab https://youtu.be/2lx77K_9dCQ You can buy the AFS Foundry in a box kit for about $1500 here: https://www.afsinc.org demonstrations-foundry-box We laser cut and 3D Print our foundry patterns