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