The system also includes a voltage source providing {HEAD ~ a direct current level voltage} with respect to an electric ground and a switching circuit adapted to operate {TAIL ~ the motor} 
The system also includes a voltage source providing { HEAD ~ a direct current level voltage } with respect to an electric ground and a switching circuit adapted to operate { TAIL ~ the motor }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL