Radio people

[goldfish]

Strange sense of de-ja-vous, I think I asked for help about radio stuff a while ago but I think it was a different problem.

Anyway, I'm making up two simple circuits for my Physics presentation. An AM transmitter and an AM receiver. The receiver is easy, I can do that, but does anyone have a good link to some easily modifyable (i.e. I can calculate the capacitance to transmit at 23MHz or 47MHz) circuit diagrams so I can make my transmitter?

I know I'd probably find a circuit that does just this in a toy walkie talkie, but I'd rather make the circuit myself to demonstrate how they actually work (with reference to circuit resonance and the like).