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  • As you suspect a short circuit, have you checked for that? Also: Are you sure, that the power supply is broken? Or is it the Arduino? The barrel jack is connected to a voltage regulator, which will go into emergency shutdown, if you draw more current through it, than supported, (for genuine Arduinos). Cheap clones might get their voltage regulator destroyed. Please show your real circuit, so that we can check for a short circuit Commented Jul 13, 2020 at 10:19
  • You need to troubleshoot the system. 2 failed power supplies in a row seems suspicious. I would try to rule out a problem with your Arduino or with your circuit. Buy a multi-tester and measure the voltage out of your power supply, and the resistance of your circuit. You might want to add a 2A fuse to your power supply to protect it. (You'd need a male and a female barrel jack connector, a fuse holder, some wire, and a soldering iron.) Commented Jul 13, 2020 at 11:41
  • Switch-mode based DC adapters virtually have to have short circuit protection and OCP to pass UL certification (otherwise it would fail). Most smps driver chips have that built-in as well, so if it's a recently made adapter, that's probably not the issue. Commented Jul 13, 2020 at 19:21
  • Hi @chrisl I have uploaded a photo of the schematic. Can you help to take a look? The Arduino works perfectly fine because it is able to power up via USB. I am supplying a 2A into the Arduino which requires only 1A. I read on forum that supplying more current is fine Commented Jul 14, 2020 at 4:24
  • @DuncanC Hi, I've tested the adapter, it doesn't have any voltage output. So pretty sure the adapter is damaged. I'm trying to find out why the adapter is damaged Commented Jul 14, 2020 at 4:25