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