In {TAIL ~ preferred embodiment} the control circuit consists of {HEAD ~ a moment defining circuit} for defining moment of power level changing and a level changing circuit for fulfilling power level changing 
In { TAIL ~ preferred embodiment } the control circuit consists of { HEAD ~ a moment defining circuit } for defining moment of power level changing and a level changing circuit for fulfilling power level changing
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH