This half wave voltage signal is fed to the base of a switching transistor T, whose collector lead is coupled across a resistor RC to {HEAD ~ the positive power supply voltage} of {TAIL ~ the apparatus} 
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This half wave voltage signal is fed to the base of a switching transistor T , whose collector lead is coupled across a resistor RC to { HEAD ~ the positive power supply voltage } of { TAIL ~ the apparatus }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL