I'm designing a setup for a travelling nature exhibit for a museum. You push one of 3 buttons, and it plays a sound file. I'd like the setup to be self contained and not need an external power supply in case they want to set up away from an outlet. The SparkFun MP3 Trigger by itself has a rated "id…

Very low power mp3 trigger

CrossRoads May 6, 2014, 6:43pm 4

3 AAs, 3 Cs, 3Ds. etc. 4.5V is just fine.
Here's a crude drawing of what's needed.

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