Can I safely connect my original Arduino Uno to a 19V adapter? I have an original Arduino Uno R3. According to the specifications the recommended input voltage is 7 to 12 Volt.

However, I have a laptop adapter of 19V that I want to use to power my arduino because it offers more current than the 9V adapter I have as well.

I don't want to damage the Arduino or the DFRobot 2A Motor Shield I'm using. Can I safely plug in the adapter and will it still work correctly?
According to the page you linked:


  The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.


So, yes. You can use the 19V external power supply to power the board. However, be aware that the voltage regulator can overheat over time and damage the board.