How do I construct a basic amplifier circuit?

Ok so here it is: I am in an electronics class where i have to build a solar powered alarm that will sound when the sun comes up at 900Hz for a time of 9 seconds. I have constructed this fine but my problem is building an amplifier circuit for the speaker. We are useing 8 omh speakers and my instructor says... show more Ok so here it is:

I am in an electronics class where i have to build a solar powered alarm that will sound when the sun comes up at 900Hz for a time of 9 seconds. I have constructed this fine but my problem is building an amplifier circuit for the speaker. We are useing 8 omh speakers and my instructor says that we can only use basic components. (for example NPN transistors, resitors, voltage reg., capacitors) I need the simplest amplifier circuit you can think of.

Thanks alot
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