What does these simbols represent?

[transgalactic]

what does these simbols represent??

http://img257.imageshack.us/my.php?image=25544716ds5.gif

 

[berkeman]

What are your thoughts? Those are pretty basic symbols.

 

[sirzerp]

Op amp, unknow, current source

 

[berkeman]

Op amp, unknow, current source

I want transgalactic to give us more info and tell us what he thinks. This question is too much like a homework/coursework question, where we should be sure that the original poster (OP) does most of the work.

transgalactic?