{TAIL ~ an electronic switch} connected to {HEAD ~ the battery} and having an open and closed duty cycle 
{ TAIL ~ an electronic switch } connected to { HEAD ~ the battery } and having an open and closed duty cycle
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH