How do I construct a basic amplifier circuit?
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.