Perfboard is designed for that 
But 800mW is still only 160mA and I don't know which touch screen but combined you're probably <300mA. I would indeed not draw that from the Arduino but it's an order of magnitude less then 2A 
Perfboard is designed for that
But 800mW is still only 160mA and I don't know which touch screen but combined you're probably <300mA. I would indeed not draw that from the Arduino but it's an order of magnitude less then 2A