A Boost Strap circuit lifts {HEAD ~ the gate} of coil switch circuit above {TAIL ~ the battery voltage level} and turns on the coil switch 
A Boost Strap circuit lifts { HEAD ~ the gate } of coil switch circuit above { TAIL ~ the battery voltage level } and turns on the coil switch
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH