Purple = carrier wave
Green = information signal
Orange = Amplitude Modulated signal
Purple carrier wave ~75kHz square wave created with op amp, low pass filtered twice with RC network to vaguely resemble a sine wave then amplified by op amp.
Green information signal ~150 Hz square wave generated by 555, low pass filtered thrice with RC network to vaguely resemble sine wave, then amplified by op amp.
Green modulates Purple via n-channel MOSFET to create Orange, the AM signal.
