I am using the Qwicc Trigger MP3 Player with an SD card. It is connected to an Arduino UNO that has a Sparkfun Spectrum Shield connected to it. When I connect the 3.3v from the Trigger to the 3.3v on the shield my LEDs flicker along with speakers making a humming sound. I have a cheap MP3 board set up in the same fashion but does not use the 3.3v and everything works perfectly. The reason I am needing the Trigger is so the music will stop after playing 1 song and I can add an extra button to play multiple songs. Any suggestions on how to get rid of the humming noise coming from the board? Any help is greatly appreciated.
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