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An AM modulator can be made by simply running two signals at each other across the PN junction of a transistor. The amplitude simply changes the higher frequency carriers amplitde at a rate. How is this different from addition?In addition, you have the composite which will look sort of like the midpoint between the two signals. With a transistor it is gain dependent. So the output will look like the input plus the affect the signal has on it. Which means the resultant peak to peak gets multiplied by the resistance ratio. The peak to peak is always changing because of the signals interaction with the oscillator. It is funny, but that is how an amplifer works. It multiplies which gives you a far different value than just addition.

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