I have a question about powering an Arduino from an external power source. This is a 12v wall wart which is being used to power a motor. This motor is being controlled by an NPN transistor using a PWM port on the Arduino. Currently I am protecting the transistor using a diode across the terminals of…

Inductive spike (kickback) how protect Arduino

buzzkill October 10, 2017, 12:02am 5

try one of these ! I use them all the time great little device

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