Microphone Preamplifier

Suggestion for project on op-amps….Its a 2nd year electronics course project?

Its a final project of the semester..im in an australian uni studying electrical engineering…What would be the best choice for me …Thanks
Choices are::
1.An audio frequency integrator, using discrete components
2.An audio frequency differentiator, using discrete components
3.A variable frequency function generator, with sine, triangle and square [...]