The Vin pin, if I've understood correctly, is connected directly to the +Ve of the barrel connector and so by passes the regulator. Putting 12V on the barrel connector will give me 12V on the output Vin pin. Is that right?
I've seen some posts about the Vin pin, and one says that I could draw up to a max of 1A.
I've had a look at the PC tracks for the Vin pin on an "UNO" and they don't seem very thick, is the 1A max correct? (Assume that the PSU can supply the Arduino with 1A left over).
I intend to use 250mA, but I like to have a large margin of error.