I have built a project around arduino Duemilanove with ethernet shield.
All works normally when the board is powered with usb.
The Ethernet shield does not work when the board is supplied by 12V.
The arduino regulator is very hot. The leds on the ethernet shield is blinking RX / FULLD/100M/LINK.
I have read in the documentation that we can use 12V dc supply.
Someone knows what is the problem ?
Thanks in advance.
PS : a quick patch will be to power with 5V the arduino board with usb connector