I want to power my core with this: https://www.adafruit.com/products/259. That will feed 3.7v into the VIN pin.
Then, I need to power this: https://www.adafruit.com/products/1381
That vs1053 breakout has a VCC pin and a 3v3 pin. I’m hoping I can power one of those pins with the 3v3 output from the Spark core 3v3 pin. I just don’t know how I can tell whether the VCC pin can accept 3v3 to run the board, or whether the 3v3 pin on the vs1053 is an input or an output. Here’s the schematic for the breakout board: https://www.adafruit.com/products/1381