In accordance with another feature of the invention, {HEAD ~ a Schmitt trigger} can be used to generate {TAIL ~ pulses} from the alternating current control voltage 
used to generate
In accordance with another feature of the invention , { HEAD ~ a Schmitt trigger } can be used to generate { TAIL ~ pulses } from the alternating current control voltage
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH