well you actually built a radio.. not weird at all. Look at this circuit...
A radio only needs three things:
- a tuned circuit ( the length of wire on your mic input and its capacitance makes a tuned circuit)
- a detector ( the diodes in the op-amp are the detector) and
- an amplifier with gain... that's the op-amp itself.
You'll find, sadly, that if you put a 1nf or 500pf capacitor from pin 2 to ground, your radio will die, but it'll work as a mic amplifer!
PS: try putting an aligator clip on pin 2 as an antenna, and you should get all kinds of stuff.