In the preferred embodiment, {TAIL ~ the controller} generates a pulse width modulated signal which is used to drive {HEAD ~ the transistor switch} 
In the preferred embodiment , { TAIL ~ the controller } generates a pulse width modulated signal which is used to drive { HEAD ~ the transistor switch }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD