Even before I started messing around on a breadboard I always thought it'd be cool to make my own parabolic microphone. Since then I've built a few amplifier circuits looking for the right circuit to place at the heart of the dish. Each one has had its own pros and cons, but I've never simmed one with such great results as this one has. As of right now I haven't built it for real to test it out but, the predicted frequency response is spot on! Check it out for yourself by swinging the a.c. voltage low and high, observing the corresponding output power. This is an internet replica (apologies to the author for forgetting your name) but the called for chip is the TL072..
#Correction/Addition# -- By "swing the a.c. around" I mean to say the Frequency, not the voltage itself. This circuit seems to amplify the human voice heard from around 800Hz to 2 or 3KHz+ pretty well from what I could tell. But understand that the amplitude of the subject's voice plays a role as well, which I haven't quite figured out how to sim yet. *shrug*
