Power Supply for Arduino

i'm working on project run in car. read post (http://www.arduino.cc/en/reference/board) specifies arduino (i'm using uno r3):

quote

external power supply in (9-12vdc) - x1 (pink)

does know if allow me plug arduino straight 12v cigarette lighter socket - or need sort of "protection" adding in line before arduino?

you need protection. 12v supply in car can nasty.


http://www.ebay.com/sch/i.html?_nkw=12v+noise+filter

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