op amp project

can anyone give me a schematic diagram of a cicruit that can be used as a project? my project needs at least 3 of the op-amp applications of the given choices.. the choices are oscillator, rectifier, amplifier, comparator.. pls reply asap. tnx

If I do your school work for you then you won't learn anything.
www.google.com has millions of circuits if you ask it for Opamp Oscillator Circuit, Opamp Rectifier Circuit, Opamp Amplifier Circuit etc.