The second AM modulator has U2D with U1B and U1C. In a common configuration as a multiplier circuit, Figure 23 has Vin2 as the modulating signal and Vin1 as the carrier signal.

A crystal radio is a common enough science fair project, but the problem is, there isn’t much on anymore. The answer is, of course, obvious: build your own AM transmitter, too. AM modulation … ...

For a more analog MOSFET application, consider this simple AM modulator. Figure 4 MOSFET amplitude modulator The circuit consists of an N-channel MOSFET, two resistors, and a Schottky diode. The ...

Here we report a flexible all-graphene modulator circuit with the capability of encoding a carrier signal with quaternary digital information.