Hi I really liked the previous thread about tips and tricks. I am a student...I want to begin the second part like this..

The opamp is very beautiful and intelligent component that will maintain the output to match the input values..
One great application is to make constant current sourece..as in the figure below:
http://upload.wikimedia.org/wikipedia/commons/thumb/8/81/Op-amp_current_source_with_pass_transistor.svg/220px-Op-amp_current_source_with_pass_transistor.svg.png

hope to hear from all of us

 

Or like this. http://www.allaboutcircuits.com/vol_3/chpt_8/7.html
Have you looked through the AAC tutorials?

Ken