I made this exact build on my Arduino, with the following differences:
- I'm using Arduino Nano
- Transistors I use are 2N2222A
- I'm running everything on 12V except Arduino, I use LM317 to feed Arduino 6v
Here's what happened. First, it started to get strange voltage, arduino would light up even when disconnected from power. After that, Arduino kind of got fried, when I connect it to USB, nothing happens. I can give it 6v to VIN and ground it with the rest, but turning potentiometers only dims the onboard LED of the Arduino and that's it.
Now I'm going to go and pick up a new nano, however, I'd prefer not to fry that one, so figuring out why this one burned would be nice.
PS. The image shows RGB LED instead of RGB LED Strip because 123d doesn't have strip component.