I tried to simulate a modulation circuit which uses a comparator, following this video.
The output I get at the 1 kΩ resistor is weird; it should be the same shape as the send signal above.
May I know what values of capacitor and inductor are used, and whether the resistor value at the output also affects the shape of the send signal?
Is my LTspice output correct (oscillating wave output seems triangular) and should the carrier signal, audio signal and send signal be AC or DC? The video diagram shows all of them are DC.