Adafruit MicroSD Card Breakout Board

What are 12 and 15 connected to in the image above?

Thanks for any help!

Nothing! They are spare level shifters.

So would the circuit function without them?

No
because they are inside the same I.C. as the other 4 buffer drivers.

Cannot have one without the other.
:wink:

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Right so I am designing a pcb and wanted to incorporate a microsd card port how then do I connect the SD & MMC chip to those amplifiers? What pin are they connecting? Or are they just present but not in use?

What is the microcontroller you are using ?

I am using a MK20DX256VLH7 processor

Is that a 3.3V logic level processor ?

yes

So your providing a port to convert from 3.3V to 5V logic, so you can then connect a SD card adapter which then converts from 5V logic to 3.3V logic.

Why not connect direct, SD cards are 3.3V devices ?