The waveforms 304 and 306 represent {HEAD ~ the rectified line voltage} referred to as signal VBUS and {TAIL ~ the virtual voltage} as applied to the solenoid 16 as a result of the switching action of the transistor switch 64 
The waveforms 304 and 306 represent { HEAD ~ the rectified line voltage } referred to as signal VBUS and { TAIL ~ the virtual voltage } as applied to the solenoid 16 as a result of the switching action of the transistor switch 64
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH