@WereCatf Ok, you're right. I mean the voltage regulators which steps down the voltage to the needed voltage for the arduino. Sorry had not enough caffeine. Ok, thanks for the answer about the Arduino Dock V1. It seems they haven't changed the voltage regulator since they write a warning: The DC barrel jack may also be used to provide power to the Omega using a DC power adapter. Note that the Arduino Dock’s DC barrel jack should only be used with 5V DC power supplies. If a higher voltage is used, your Omega and Arduino Dock have a high chance of being damaged! Maybe they will release the schematic of the arduino dock V2 the next days so we can look about it.