Power Supply
Power is supplied to the MCBXC866 board by an external 6 - 12 Volt DC power supply which should be capable of providing 100mA.
The voltage regulator (IC3) generates 5 Volts or 3.3 Volts DC.

The connection uses a standard barrel plug. The center hole provides positive voltage.
 | Caution: Using a power supply with the wrong polarity may damage the board. |