I have a design that I uploaded not long ago here:http://forum.arduino.cc/index.php?topic=260610.msg1840409
i dont think my question will be related so for basically there is an atmega328 with 3 tlc5940 daisy chained and 16rgb leds, the 7805 voltage regulator has got 2 capacitors on input/outputs of 10uf each..
I got the pcbs and i connected everything (dip sockets/crystal/ceramic capacitors/power jack etc)
Instead of waiting to connect all Leds and then turn everything on, i connected only 1 led.
That led turned on once and that's it, the 7805 was too hot to touch, i got burnt.
the power adapter is a 12v 1.5a, i have around 3 which i tried, after that i tried a 5v battery but the 7805 is already dead.
is this related to the fact that the power didn't have where to go so the 7805 was fried as it was disspiated as heat at the regulator?
this doenst make sense to me, as not all the leds are turned all the time as well.. what can cause the 7805 to not be able to handle 12v?? i saw this in another design i made on a strip board