So you think I have to stick to my already made pcb and don't try an 20 MHZ crystal.
Here it is the final pcb in 3d and shematic I am going to use.
I am finishing the firmware part now thanks to Darrel ADC convertion and your help. I will use 14bit with 8mhz internal (12f683). The pcb will support ICSP an optional button and a led indicator. I have not try the pcb (in real) only in Proteus sim. I will let you know of the progress. for the moment take a look...
EDIT: in schematic the 100n pic decoupling is missing (in pcb is ok)
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