{HEAD ~ The control voltage UST} is coupled to {TAIL ~ a half wave rectifier D}, which produces a half wave voltage signal 
is coupled to
{ HEAD ~ The control voltage UST } is coupled to { TAIL ~ a half wave rectifier D } , which produces a half wave voltage signal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH