Hello all,
I have an idea to measure apparatus's internal resistance before applying mains voltage to it. Doesn't sound so difficult at first, i'd just apply 5v and read the voltage at the other end. But I also want to make sure that my microcontroller (Arduino for prototyping) will survive if the same circuit comes in contact with the mains (220VAC). My friend draw me a schematic for that, but he was not absolutely sure and suggested to collect more information. And that's why I'm here now. Please have a look of the schematic and give me your opinion. Thank you.
Schematic: https://drive.google.com/open?id=0B22IdkC21w6hWnZ6aUZoWEdiVlE&authuser=0
Moderators note: inserted full image
I have an idea to measure apparatus's internal resistance before applying mains voltage to it. Doesn't sound so difficult at first, i'd just apply 5v and read the voltage at the other end. But I also want to make sure that my microcontroller (Arduino for prototyping) will survive if the same circuit comes in contact with the mains (220VAC). My friend draw me a schematic for that, but he was not absolutely sure and suggested to collect more information. And that's why I'm here now. Please have a look of the schematic and give me your opinion. Thank you.
Schematic: https://drive.google.com/open?id=0B22IdkC21w6hWnZ6aUZoWEdiVlE&authuser=0
Moderators note: inserted full image
Last edited by a moderator: