Part	Value
----------------------------------------------------
D1 	1N4001 or equivalent
C1 	10 uF - 25 V 
C2  	10 mF - 25 V elettrolitico   
C3 	100 nF ceramic capacitor
C4, C5  22 pF ceramic capacitor (NP0) 
R1 	10k ohms 
R2 	4700 ohms  
R3 	10k ohms trimmer (lin.)
LCD 	2x16 display (HD44780-based or comaptible) 
X1 	20 Mhz crystal 
U1 	LM78L05 
U2 	PIC16F628A