Hmm...I forgot about antenna length, what I don't get (have tried google) is that how they make the carrier frequency very in AM, is it done by giving the amplified lower frequency (audio or any switching freq.) voltage output as the SUPPLY, to the carrier oscillator the way I shown in the pdf ? I am not sure that's the way, just show me what is the basic behind this and I'll find a way, I talked about op amp in a hurry but, I just want to understand the AM concept (not that simple "overlapping" block diagram theory),HOW A CIRCUIT SUPERIMPOSE LOW FREQUENCY ON HIGH FREQUENCY?, i.e. How the amplitude of high (carrier) frequency follows the amplitude of low frequency? Please help me with that and I'm sure I'll find some way to do that, either from Google or myself or what ever.I searched for AM in many way and all end up in a fine working ckt schematics but, I don't want that, not at least now.
EDIT:
In short, I need a circuit explanation for AM