This results in a ramp shaped current rise in the first coil L1 which is ended again when {HEAD ~ the field} effect {TAIL ~ transistor T} is cut off 
effect
This results in a ramp shaped current rise in the first coil L1 which is ended again when { HEAD ~ the field } effect { TAIL ~ transistor T } is cut off
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH