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