In my lab course, we constructed a circuit that would amplify signals. Here is an image of the circuit. http://desmond.imageshack.us/Himg442/scaled.php?server=442&filename=imgfw.jpg&res=medium [Broken] My question is, what is the purpose of the capacitors? In other words, if I was making a signal amplification circuit without this as aid, why would I use capacitors? I asked my professor and he didn't have a concrete answer. Also, is this the type of circuit that OpAmps Use? Thanks!