Hi all,

I really desprately need help on this. It's a school project and i need to explain this circuit by tomorrow. have been researching and everything but i wasnt able to understand it at all.
could any of you kindly explain it to me ? on how each and every components works, affects. especially for the comparator( it's an op amp) part. With and without feedback,what it actually affects ? and can i actually know how to calculate the gain for op amp ?
i've got to go study on capsense proximity sensor for now,which is dued tomorrow too. so i really hope you guys would really help me out. PLEASE PLEASE PLEASE.

i've attached the schematic and the component list. please take a look.
i thank each and everyone of you.
THANK YOU!!

http://i229.photobucket.com/albums/ee197/pllp89/Schematic-2.jpg
http://i229.photobucket.com/albums/ee197/pllp89/componentlist.jpg

 

Hello,

This looks like a homework question.
Here is a hint, there are two comparetors in the schematic.

This picture comes from this eBook page:
http://www.allaboutcircuits.com/vol_3/chpt_8/12.html

Greetings,
Bertus

 

hi,

thanks for your reply. but i dont really understand what you're explaining. i tried reading up on the whole chapter under op amp already. but i still dont know how this works. i just need to have a brief explaination of how this whole circuit actually works.

thank you for your advice..