My reference is this tutorial. http://arduino-for-beginners.blogspot.com/2011/04/controlling-12v-fan-speed-with-pwm.html
My concern is can I use the Vin pin of Arduino to be the 12v input of the fan. Because it is said in the blog. That I should use different 12V input. Is using the Vin of my Arduino can damage it?
By the way. I'm using a Universal AC/DC adaptor as my external input of my arduino. The voltage that it can produce is range froum 1.5V to 12V. Input: 220V~60Hz Output: 1.5-12V ("I don't know what is the symbol after this, but it is a line on top and three dots in the bottom" after that symbol..)500mA.
Thanks for helping me :)