Hello 
Well i got this project to do and i would appreciate it if someone can help me understand what these circuits do exactly
the circuits can be found at pages: 13,14 and 15 at this link:
http://ww1.microchip.com/downloads/en/AppNotes/00939a.pdf
i know what each circuit is for but i need the details of how everything work
i really need to understand it 
Thanks All
YazanJuve
Well i got this project to do and i would appreciate it if someone can help me understand what these circuits do exactly
the circuits can be found at pages: 13,14 and 15 at this link:
http://ww1.microchip.com/downloads/en/AppNotes/00939a.pdf
i know what each circuit is for but i need the details of how everything work
Thanks All
YazanJuve