Hi, I've been trying to create the attached circuit on my breadboard with little luck, been staring at it for literally hours - I'm sure I have it wired correctly (heard that before?) but it's not working as I expect.
I have 15v input connected across 1) & 2) on the schematic, across the output 3) & 2) I'm measuring 14v, instead of the expected regulated 12v. After a few seconds the 7812 gets extremely hot, even with no load. Set at 15v, my PSU reports 250mA current draw with no load apart from the circuit drawn.
I don't actually have any .33uF capacitors so I'm using .1uF across the 7812 input and outputs.
What is the most likely cause for the above behaviour do you think? Thanks.