5 amperes except the 9V output which will be used to power the arduino and microcontroller boards and therefore 1 ampere output current is enough to power them. This circuit is using three ICs from LM1084 positive voltage regulators series and one IC from LM2940-CT series. The input power can be provided from a 15V 5A plug pack, the input current can be increased from 5A to 16A if each output of LM1084 requires 5A current. You can also use LM1085-12, LM1085-5.0 and LM1085-3.3 in the place of LM1084 series if current requirements is not more than 3A. All the capacitors should be 35V or 50V ratings, and seperate heatsink requried for each IC.