Hi folks!
my problem is, that my voltage regulator (7805) gets extremly hot…My power supply has only 400mA und i´m going to supply 9 V.
The circuit of the CoreModule seems OK but nothing works probably. (Just testet LCD - which is correct working on another Core Module).
I´ve noticed that my C3 Cap has 22uF than 10 uF but i can´t believe that this has such consequence.
Could a defekt of the transistor a reason?
Cheers!
André
hi André,
i guess the 22uF cap is not the problem.
what is the voltage value on your 7805 input pin? - if you have more then 10V it can cause the heat - in this case you should take a cooling element for the 7805 or another transformer.
power supply:
i made good experiences with 7805 ( 1A ) and a 7.5V (800mA) transformer…
…but maybe it’s a circuit problem - in this case you can:
 check all the soldering joints for short circuit or false connection (i know you have allready but who knows (i found some bugs after chcking the circuit-board about ten times…))
the next option to find the bug is to remove suspect components step by step from the core modul and check the heat of the 7805 each time - if no component left over check the soldering joints again… 
good luck!
sounds like a short circuit!
put a fuse in-line and see if it blows. Its a good idea to use a fuse until you get everything sussed to save damage on your board