Im tryng to drive a relay with my arduino uno. Im using this circuit found on this page: http://www.glacialwanderer.com/hobbyrobotics/?p=9
Only difference is that im using 1N4007 diode what shouldnt make any difference and this relay: http://www.kysanelectronics.com/Products/datasheet_display.php?recordID=1225
Im powering my circuit and arduino from same 9v adapter and taking 3.3V for relay from arduino 3.3V output.
The problem is that when i power on the relay (turn arduino digital pin 3 high) the voltage regulator on arduino board gets really hot (http://www.advanced-monolithic.com/pdf/ds1117.pdf
Is there something wrong with the circuit or should i use seperate power suplys?