Clock pulses arise across {HEAD ~ the load resistor RC} of {TAIL ~ the switching transistor} corresponding to the appearance half wave voltage signals across the half wave rectifier D 
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Clock pulses arise across { HEAD ~ the load resistor RC } of { TAIL ~ the switching transistor } corresponding to the appearance half wave voltage signals across the half wave rectifier D
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH