DCC AUX Buck Converter Shield for Arduino DCC EX Command Station.

This shield provides a 5V power supply for the Arduino board without using the onboard 5V LDO of the Arduino. The DCC EX stack can therefore be powered from one single power supply of up to 18VDC without overheating the LDO and VIN can directly be used to power the motorshield for track power of up to 3 Amps.