A controller may send signals to {TAIL ~ one or more driver circuits} for directing {HEAD ~ operation} of the actuators 
A controller may send signals to { TAIL ~ one or more driver circuits } for directing { HEAD ~ operation } of the actuators
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH