Hi,
I'm currently learning how to do PCB and stuff. I just did one to power and control LEDs from an Arduino with a MSGEQ7 to make it sound reactive.
As soon as I powered the PCB with 12v, the chip became hot so I unplugged it. But, it was too late. the Nano became unresponsive from USB, unable to flash anything to it. I double checked my schematic and my PCB with a multimeter but I can't find the source of the problem.
Can you help me? Thank you
There could be a shortcut in the PCB.
Can you power it with 7.5V ?
Is your power supply very cheap or very strong ?
Have you double checked the polarity of you power connections to make sure you dont have the reversed.
Also, are you using an Arduino Nano board or just the Atmel chip and if just a chip which one?
I am not certain but I think some of your pinouts may be wrong on your diagram.
Where does +5V come from ?
The Arduino Nano's VIN was supplied with 12V and internal linear regulator (tried to) provide 5V. 
No it's a chinese Arduino Nano board, the pinout is right
It's a good power supply. The polarity is correct. The Nano is dead so it's kinda hard to test a different voltage since it was my only one.
Which mean? I'm not supposed to do that?
If you have a multimeter then I would suggest you check the power supply output voltage.
If its over 12v then that could be your problem, personally I am sticking to around 5v supplies for mine.
It's at 11.96v. It's the first time I tried running a Nano above 5v. I will probably do a revision with a 7805 to power the Nano
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