Hi, Passion

we just had forgotten the reverse diode ( 1N400x) from regulator output to its input ...

to be fully "bullet-proof" ... ( see 78L datasheet ...)

But ... , If some LCD (or LEDs ) are used as a display ( we didn't talk about that ...) , that could make you need a 7805 instead of the 78L05 ( in all cases will improve the 5v ref voltage stability ... see output impedance of the 78L series vs. 78 series ... )

Alain

PS: No, it's not the LCD that will draw current .... but it's backlighting !!!