Hi,
I'm using an arduino uno, a motor shield from adafruit, and one stepper motor (3.3V, 3.3A).
I burnout a 5v transformator (connecting to the Arduino jack, jumper of the motor shield off) while the installation was working for 20 mn.
Then I burnout the motor shield itself!!!! yes I did!!!! (connecting a 5v transformator to the Arduino jack, and a 12v transformator to the motor shield PWR) after a few second working!!!!
So now I'm looking for help to be safe for my next try!!!!!
If someone can understand what and where is the error, this would be wonderful!!!
Thanks