----audio analyzer using neopixels---- I modified the code of the "Holiday Lights and Sounds" proyect from Jeremy Blum http://www.jeremyblum.com/2011/12/25/tutorial-14-for-arduino-holiday-lights-and-sounds/ and I used the same amplifier circuit from that project, but I used an audio isolator transformer for each audio channel, so I wouldn't get noise on the speakers
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